By state
Historic places in Iowa
2,367 Iowa listings on the National Register of Historic Places, each mapped and dated.
2009
"Lockkeeper's" House — Eldon, Davis County, Iowa
→2002100 Block of West Broadway Historic District — Council Bluffs, Pottawattamie County, Iowa
→1998280th Street Bridge — Independence, Buchanan County, Iowa
→2002Abraham Lincoln High School — Des Moines, Polk County, Iowa
→2000Abraham Lincoln Statue and Park — Clermont, Fayette County, Iowa
→1981Adair County Courthouse — Greenfield, Adair County, Iowa
→2011Adair County Democrat--Adair County Free Press Building — Greenfield, Adair County, Iowa
→1998Adair Viaduct — Adair, Adair County, Iowa
→1991Adams County Jail — Corning, Adams County, Iowa
→1984Adams-Higgins House — Spencer, Clay County, Iowa
→1984Adams, Walker, House — Davenport, Scott County, Iowa
→2002Adel Bridge — Adel, Dallas County, Iowa
→2009Adel Public Square Historic District — Adel, Dallas County, Iowa
→1983Adler, E. P., House — Davenport, Scott County, Iowa
→2013Administration Building, U.S. Naval Air Station Ottumwa — Ottumwa, Wapello County, Iowa
→2020Agassiz School — Ottumwa, Wapello County, Iowa
→1985Agriculture Hall — Ames, Story County, Iowa
→1998Ainsworth, William W. and Elizabeth J., House — Des Moines, Polk County, Iowa
→2012Akron Opera House — Akron, Plymouth County, Iowa
→2019Albertson and Company-Rocklin Manufacturing Company — Sioux City, Woodbury County, Iowa
→1979Albertus Building — Guttenberg, Clayton County, Iowa
→1985Albia Square and Central Commercial Historic District — Albia, Monroe County, Iowa
→1998Albright Bridge — Webster City, Hamilton County, Iowa
→1978Albright House — Fort Madison, Lee County, Iowa
→2020Albright, Henry D. and Juliana (Wortz), House — Mount Vernon, Linn County, Iowa
→1998Alden Bridge — Alden, Hardin County, Iowa
→1981Alden Public Library — Alden, Hardin County, Iowa
→2014Algona Junior and Senior High School Building and High School Building Annex — Algona, Kossuth County, Iowa
→2001Alhambra Apartments — Sioux City, Woodbury County, Iowa
→2000All Saints Catholic Church — Stuart, Guthrie County, Iowa
→2003Allamakee County Court House — Waukon, Allamakee County, Iowa
→1977Allamakee County Courthouse — Waukon, Allamakee County, Iowa
→1992Allee, Jesse J. and Mary F., House — Newell, Buena Vista County, Iowa
→1975Allen House — Dyersville, Dubuque County, Iowa
→1985Allen, G. W. S., House — Mount Pleasant, Henry County, Iowa
→1987Allen, James, Stone Barn — Earlham, Madison County, Iowa
→1988Alsop, Carroll, House — Oskaloosa, Mahaska County, Iowa
→1978Alumni Hall — Ames, Story County, Iowa
→1986Ambler, Henry, House — Mt. Pleasant, Henry County, Iowa
→2020Ambrose Hall — Davenport, Scott County, Iowa
→1983American Commercial and Savings Bank — Davenport, Scott County, Iowa
→1990American Express Building--Carroll — Carroll, Carroll County, Iowa
→2001American House — McGregor, Clayton County, Iowa
→2006American Legion Memorial Building — Atlantic, Cass County, Iowa
→2015American Republic Insurance Company Headquarters Building — Des Moines, Polk County, Iowa
→1991American School of Wild Life Protection Historic District — McGregor, Clayton County, Iowa
→1983American Telephone & Telegraph Co. Bldg. — Davenport, Scott County, Iowa
→1998Ames Creek Bridge — De Witt, Clinton County, Iowa
→2002Ames High School — Ames, Story County, Iowa
→2009Anamosa Main Street Historic District — Anamosa, Jones County, Iowa
→1983Anamosa Public Library — Anamosa, Jones County, Iowa
→1986Anderson, D. H., Building — Maquoketa, Jackson County, Iowa
→1991Anderson, D. H., House — Maquoketa, Jackson County, Iowa
→1985Andrew-Ryan House — Dubuque, Dubuque County, Iowa
→1988Andrews, Josiah, House — Des Moines, Polk County, Iowa
→1980Andrus, A. J., Duplex — Mason City, Cerro Gordo County, Iowa
→2006Ankeny Building — Clinton, Clinton County, Iowa
→1991Anthony, Horace, House — Camache, Clinton County, Iowa
→2001Antioch School — Anamosa, Jones County, Iowa
→2007Antlers Hotel — Spirit Lake, Dickinson County, Iowa
→1981Appanoose County Courthouse — Centerville, Appanoose County, Iowa
→1997Appanoose County Sheriff's House and Jail — Centerville, Appanoose County, Iowa
→2016Apperson-Iowa Motor Car Company Building — Des Moines, Polk County, Iowa
→1983Architecture of Henry K. Holsman Historic Campus District — Fairfield, Jefferson County, Iowa
→2020Argonne Building — Des Moines, Polk County, Iowa
→1983Argyle Flats — Davenport, Scott County, Iowa
→2011Armour Creameries Poultry House — Coon Rapids, Carroll County, Iowa
→1987Armstrong, George and Susan Guiberson, House — Winterset, Madison County, Iowa
→1989Armstrong, Robert and Esther, House — Cedar Rapids, Linn County, Iowa
→1982Arthur, Thomas, House — Newton, Jasper County, Iowa
→1993Ash Park Historic District — Mount Vernon, Linn County, Iowa
→1992Ashby Manor Historic District — Des Moines, Polk County, Iowa
→1998Ashby, Atchison A., House — Sioux City, Woodbury County, Iowa
→2001Ashton, Ned, House — Iowa City, Johnson County, Iowa
→1992Atchison, Topeka and Santa Fe Passenger and Freight Complex Historic District — Fort Madison, Lee County, Iowa
→2002Atlantic High School — Atlantic, Cass County, Iowa
→2003Audobon County Court House — Audubon, Audubon County, Iowa
→1977Audubon County Courthouse — Exira, Audubon County, Iowa
→1978Aunty Green Hotel — Bonaparte, Van Buren County, Iowa
→2004Ausadie Building — Cedar Rapids, Linn County, Iowa
→1978Averill, A. T., House — Cedar Rapids, Linn County, Iowa
→2015Averill, Glenn M. and Edith, House — Cedar Rapids, Linn County, Iowa
→2008Avery Theater, The — Garner, Hancock County, Iowa
→1996Ayrshire Apartments — Des Moines, Polk County, Iowa
→2013B Avenue NE Historic District — Cedar Rapids, Linn County, Iowa
→2004B'nai Jacob Synagogue — Ottumwa, Wapello County, Iowa
→1991Backbone State Park Historic District — Strawberry Point, Delaware County, Iowa
→1990Backbone State Park, Cabin--Bathing Area (Area A) — Dundee, Delaware County, Iowa
→1990Backbone State Park, Picnicking, Hiking & Camping Area (Area B) — Dundee, Delaware County, Iowa
→1990Backbone State Park, Richmond Springs (Area C) — Dundee, Delaware County, Iowa
→1982Badgerow Building — Sioux City, Woodbury County, Iowa
→1998Bailey, George A. and Mary Tinkel, House — Correctionville, Woodbury County, Iowa
→1996Bailey, William H. and Alice, House — Des Moines, Polk County, Iowa
→1982Baird, E. J., House — Millersburg, Iowa County, Iowa
→1978Baker--Devotie--Hollingsworth Block — Des Moines, Polk County, Iowa
→2008Baker--DeVotie--Hollingsworth Block (Boundary Increase) — Des Moines, Polk County, Iowa
→1996Baker, C. H., Double House — Des Moines, Polk County, Iowa
→1984Ball-Waterman House — Davenport, Scott County, Iowa
→1994Ball, Dr. J. O. and Catherine, House — Mt. Pleasant, Henry County, Iowa
→1985Ball, W. C., House — Fairfield, Jefferson County, Iowa
→1983Ballard, John W., House — Davenport, Scott County, Iowa
→1999Bandshell Park Historic District — Ames, Story County, Iowa
→2003Bangs, John and Lavina, House — New London, Henry County, Iowa
→2004Bank of Sumner — Sumner, Bremer County, Iowa
→1983Banta, J. V., House — Osceola, Clarke County, Iowa
→1977Baptist Church — Sperry, Des Moines County, Iowa
→1995Barkley, Alonzo J. and Flora, House — Boone, Boone County, Iowa
→1976Barrows, Edward S., House — Davenport, Scott County, Iowa
→1998Bartlett, Walter M., Double House — Des Moines, Polk County, Iowa
→1999Basilica of St. Francis Xavier, Church and Rectory — Dyersville, Dubuque County, Iowa
→1992Bassnett--Nickerson House — Maquoketa, Jackson County, Iowa
→1996Bates Park Historic District — Des Moines, Polk County, Iowa
→1996Baum, William A. and Etta, Cottage — Des Moines, Polk County, Iowa
→2020Bauman, Augustus and Elizabeth (Huntsberger), House — Mount Vernon, Linn County, Iowa
→2015Baxter, H.A., Coal Company Historic District — Washington, Washington County, Iowa
→1977Bay Settlement Church and Monument — Delhi, Delaware County, Iowa
→1982Beach School — Mount Vernon, Linn County, Iowa
→2007Beaconsfield Supply Store — Beaconsfield, Ringgold County, Iowa
→2020Beaver Creek Bridge — Schleswig, Crawford County, Iowa
→1998Beaver Creek Bridge — Perry, Dallas County, Iowa
→1998Beaver Creek Bridge — Ogden, Boone County, Iowa
→1988Beck, Chief Justice Joseph M., House — Fort Madison, Lee County, Iowa
→1978Beck, James A., House — Fairfield, Jefferson County, Iowa
→2002Bedford Commercial Historic District — Bedford, Taylor County, Iowa
→1977Bedford House — Bedford, Taylor County, Iowa
→1999Bedford Oil Company Station — Bedford, Taylor County, Iowa
→1983Bedford Public Library — Bedford, Taylor County, Iowa
→1990Beeds Lake State Park, Civilian Conservation Corps Area — Hampton, Franklin County, Iowa
→1996Beeson, Byron A., House — Des Moines, Polk County, Iowa
→1977Beiderbecke, Leon Bismark, House — Davenport, Scott County, Iowa
→1975Belknap, Gen. William Worth, House — Keokuk, Lee County, Iowa
→1983Bell, Alvin Bushnell, House — Ida Grove, Ida County, Iowa
→1988Bell, Hill McClelland, House — Des Moines, Polk County, Iowa
→2002Bell, John, Block — Dubuque, Dubuque County, Iowa
→2013Belle Plaine Main Street Historic District — Belle Plaine, Benton County, Iowa
→1998Bellefountain Bridge — Tracy, Mahaska County, Iowa
→1991Bellevue Herald Building — Bellevue, Jackson County, Iowa
→1998Benham, F. A., House — Des Moines, Polk County, Iowa
→2015Benjamin Chapel and Richwoods Cemetery — Trenton, Henry County, Iowa
→1991Bennedsen, Boldt, and Hansen Building — Kimballton, Audubon County, Iowa
→2001Bennett Building — Council Bluffs, Pottawattamie County, Iowa
→2001Bennington No. 4 — Waterloo, Black Hawk County, Iowa
→1985Benson Block — Ottumwa, Wapello County, Iowa
→2019Benson Building — Ottumwa, Wapello County, Iowa
→1976Benton County Courthouse — Vinton, Benton County, Iowa
→1983Benton, Richard, House — Davenport, Scott County, Iowa
→1972Bentonsport — Keosauqua, Van Buren County, Iowa
→1976Beresheim, August, House — Council Bluffs, Pottawattamie County, Iowa
→1983Berg, Henry, Building — Davenport, Scott County, Iowa
→1989Bergman, August H., House — Newton, Jasper County, Iowa
→1998Berkhimer Bridge — Humboldt, Humboldt County, Iowa
→1996Berry, Dr. William E. and Ethel Rosenberger, House — Oskaloosa, Mahaska County, Iowa
→1979Berryhill, Charles, House — Iowa City, Johnson County, Iowa
→2014Bertram Bridge — Bertram, Linn County, Iowa
→2014Best Oil and Refining Company Service Station — Cedar Rapids, Linn County, Iowa
→2010Best, Louis P. and Clara K., Residence and Auto House — Davenport, Scott County, Iowa
→1991Bethany Danish Evangelical Lutheran Church — Kimballton, Audubon County, Iowa
→2013Bethel African Methodist Episcopal Church — Cedar Rapids, Linn County, Iowa
→1983Bethel AME Church — Davenport, Scott County, Iowa
→2000Bethel AME Church — Iowa City, Johnson County, Iowa
→1979Bethel Church — Morning Star, Louisa County, Iowa
→1984Bettendorf-Washington School — Bettendorf, Scott County, Iowa
→1983Bettendorf, Joseph F., House — Bettendorf, Scott County, Iowa
→1987Bevington, C. D. and Eliza Heath, Privy — Winterset, Madison County, Iowa
→1976Bevington, C. D., House and Stone Barn — Winterset, Madison County, Iowa
→2010Bicksler Block — Salem, Henry County, Iowa
→1995Big 4 Fair Art Hall — Eldon, Wapello County, Iowa
→1998Big Creek Bridge — Madrid, Boone County, Iowa
→1998Big Creek Bridge 2 — Madrid, Boone County, Iowa
→2004Big Creek Schoolhouse — Polk City, Polk County, Iowa
→1991Big Mill Homestead — Bellevue, Jackson County, Iowa
→1998Big Slough Creek Bridge — Nichols, Muscatine County, Iowa
→2014Big Stone Mills — Spillville, Winneshiek County, Iowa
→1995Bigler Building — Clermont, Fayette County, Iowa
→1983Billingsley-Hills House — Iowa City, Johnson County, Iowa
→1984Binford, Thaddeus, House — Marshalltown, Marshall County, Iowa
→1979Birdsall Lime Kiln — Decorah, Winneshiek County, Iowa
→1994Bishop's Block — Dubuque, Dubuque County, Iowa
→1988Black Hawk County Soldiers Memorial Hall — Waterloo, Black Hawk County, Iowa
→2002Black Hawk Hotel — Cedar Falls, Black Hawk County, Iowa
→1983Blackhawk Hotel — Davenport, Scott County, Iowa
→1990Blackhawk State Park, Black Hawk Preserve (Area B) — Lake View, Sac County, Iowa
→1990Blackhawk State Park, Denison Beach Area (Area C) — Lake View, Sac County, Iowa
→1990Blackhawk State Park, Wildlife Preserve Area (Area A) — Lake View, Sac County, Iowa
→1973Blair House — Washington, Washington County, Iowa
→2009Bloedel, Christian, Wagon Works — McGregor, Clayton County, Iowa
→2015Bloomfield Public Library — Bloomfield, Davis County, Iowa
→1976Bloomfield Square — Bloomfield, Davis County, Iowa
→1991Boehmler, H. E., House — Hampton, Franklin County, Iowa
→1983Boerner-Fry Company/Davis Hotel — Iowa City, Johnson County, Iowa
→2002Bohemian Commercial Historic District — Cedar Rapids, Linn County, Iowa
→2012Bohemian Commercial Historic District — Cedar Rapids, Linn County, Iowa
→1990Bohemian Savings Bank — Protivin, Howard County, Iowa
→1989Bonaparte Historic Riverfront District — Bonaparte, Van Buren County, Iowa
→1999Bonaparte Pottery Archeological District — Bonaparte, Van Buren County, Iowa
→2014Boone Bridge — Boone, Boone County, Iowa
→1998Boone Bridge 2 — Boone, Boone County, Iowa
→1981Boone County Courthouse — Boone, Boone County, Iowa
→1998Boone River Bridge — Goldfield, Wright County, Iowa
→1978Boone Viaduct — Boone, Boone County, Iowa
→2013Booth, Edmund and Mary Ann Walworth, House — Anamosa, Jones County, Iowa
→2019Borts, Albert J. and Alice E., House — Iowa City, Johnson County, Iowa
→1996Bostick, William, House — Iowa City, Johnson County, Iowa
→1985Boston Block — Sioux City, Woodbury County, Iowa
→2019Boughton, Lemuel C. and Mary (Vaughn), House — Cherokee, Cherokee County, Iowa
→1990Bowers and McDonald Office Building — Grinnell, Poweshiek County, Iowa
→2014Bowery Street Grocery Store — Iowa City, Johnson County, Iowa
→2002Bowman, James W. and Ida G., House — Marion, Linn County, Iowa
→2004Boyd, Byron and Ivan, House — Des Moines, Polk County, Iowa
→2015Boyle, Hugh and Matilda, House and Cemetery Historic District — Lowell, Henry County, Iowa
→1983Boyle, John R., House — Davenport, Scott County, Iowa
→2009Boyt Company Building — Des Moines, Polk County, Iowa
→1983Brammer Grocery Store — Davenport, Scott County, Iowa
→1979Braska House — Marion, Linn County, Iowa
→1983Brazelton House — Mount Pleasant, Henry County, Iowa
→1986Brazelton House Hotel — Mt. Pleasant, Henry County, Iowa
→2013Bregant, Jean and Inez, House — Council Bluffs, Pottawattamie County, Iowa
→2003Bremer County Court House — Waverly, Bremer County, Iowa
→2014Brewer, Luther A. and Elinore T., House — Cedar Rapids, Linn County, Iowa
→1994Brick Gothic House — Albia, Monroe County, Iowa
→1983Bridge Avenue Historic District — Davenport, Scott County, Iowa
→1998Bridge near West Liberty — West Liberty, Muscatine County, Iowa
→1998Bridgeport Bridge — Denmark, Lee County, Iowa
→1998Briggs Terrace — Nevada, Story County, Iowa
→1994Broad View Ranch Historic District — Sheldon, Lyon County, Iowa
→1998Brooke Creek Bridge — Sioux Rapids, Buena Vista County, Iowa
→2005Brookhart, Smith Wildman and Jennie (Hearne), House — Washington, Washington County, Iowa
→1979Brooklyn Hotel — Brooklyn, Poweshiek County, Iowa
→2021Brooklyn Opera House–Broadway Theatre — Brooklyn, Poweshiek County, Iowa
→1986Brooks Round Barn — Charles City, Floyd County, Iowa
→2010Brown Apartments — Cedar Rapids, Linn County, Iowa
→1994Brown Street Historic District — Iowa City, Johnson County, Iowa
→2004Brown Street Historic District (Boundary Increase) — Iowa City, Johnson County, Iowa
→1978Brown, Corydon, House — Dakota City, Humboldt County, Iowa
→1982Brown, James, House — Riverdale, Scott County, Iowa
→1976Brownlie, Alexander, House — Long Grove, Scott County, Iowa
→1982Bruce Goldfish Fisheries — Thornburg, Keokuk County, Iowa
→2000Bruce's Snowball Market #1 Addition — Perry, Dallas County, Iowa
→2000Brugjeld--Peterson Family Farmstead District — Wallingford, Emmet County, Iowa
→2000Bruguier, Theophile, Cabin — Sioux City, Woodbury County, Iowa
→1983Bryan, Alden, House — Davenport, Scott County, Iowa
→2017Bryn Mawr Apartments — Des Moines, Polk County, Iowa
→2003Buchanan County Court House — 216 5th Ave., Buchanan County, Iowa
→1983Buchanan School — Davenport, Scott County, Iowa
→1998Buck Grove Bridge — Buck Grove, Crawford County, Iowa
→2022Buck, W. J., Polygonal Barn — Diagonal, Ringgold County, Iowa
→2001Budd, Prof, J.L., Sarah M., and Etta Budd, House — Ames, Story County, Iowa
→1991Budde--Singer Building — Mount Pleasant, Henry County, Iowa
→2005Buffalo High School — Buffalo, Scott County, Iowa
→1991Building at 101 North Riverview Street — Belleview, Jackson County, Iowa
→1983Building at 1119-1121 W. Third Street — Davenport, Scott County, Iowa
→1991Building at 126 South Riverview Street — Bellevue, Jackson County, Iowa
→1991Building at 130--132 North Riverview Street — Bellevue, Jackson County, Iowa
→1984Building at 202 W. Third Street — Davenport, Scott County, Iowa
→1991Building at 306 South Second Street — Bellevue, Jackson County, Iowa
→1983Building at 813-815 W. Second Street — Davenport, Scott County, Iowa
→1984Burdick, Anthony, House — Davenport, Scott County, Iowa
→1977Buresh Farm — Solon, Johnson County, Iowa
→1978Burg Wagon Works Building — Farmington, Van Buren County, Iowa
→1998Burkam, Elzy G., House — Sioux City, Woodbury County, Iowa
→1976Burlington and Missouri River Railroad Passenger Station — Burlington, Des Moines County, Iowa
→2008Burlington Depot — Ottumwa, Wapello County, Iowa
→1975Burlington Public Library — Burlington, Des Moines County, Iowa
→1998Burlington Railroad Overpass — Chariton, Lucas County, Iowa
→1983Burlington, Cedar Rapids & Northern Freight House — Burlington, Des Moines County, Iowa
→1993Burlington, Cedar Rapids & Northern Passenger Depot--Dows — Dows, Wright County, Iowa
→1990Burlington, Cedar Rapids & Northern Passenger Station--Vinton — Vinton, Benton County, Iowa
→1988Burlington, Cedar Rapids and Northern Railroad Passenger Station — Clarion, Wright County, Iowa
→1978Burlington, Cedar Rapids, and Minnesota Railroad: Walker Station — Walker, Linn County, Iowa
→1976Burlington, Cedar Rapids, and Northern Railroad-Rock Rapids Station, Railroad Track and Bridge — Rock Rapids, Lyon County, Iowa
→1983Burnett-Montgomery House — Fairfield, Jefferson County, Iowa
→1977Burns United Methodist Church — Des Moines, Polk County, Iowa
→2019Burnstein--Malin Grocery — Des Moines, Polk County, Iowa
→1983Burr Oak House/Masters Hotel — Burr Oak, Winneshiek County, Iowa
→2001Burr Oak Savings Bank — Burr Oak, Winneshiek County, Iowa
→1984Busch, Diedrich, House — Davenport, Scott County, Iowa
→1991Bush, John D., House — Exira, Audubon County, Iowa
→1992Butterworth, Nathaniel, House — Andrew, Jackson County, Iowa
→1994Byal Orchard Historic District — Mingo, Jasper County, Iowa
→2017Byfield, Dr. Albert Henry, House — Iowa City, Johnson County, Iowa
→2003C B & Q Passenger Depot — Centerville, Appanoose County, Iowa
→1978C.S.P.S. Hall — Cedar Rapids, Linn County, Iowa
→1998Calamus Creek Bridge — Maxwell, Story County, Iowa
→1978Calder Houses — Cedar Rapids, Linn County, Iowa
→1981Calhoun County Courthouse — Rockwell City, Calhoun County, Iowa
→2011Calmar Passenger Depot — Calmar, Winneshiek County, Iowa
→1983Calvary Baptist Church/First Baptist Church — Davenport, Scott County, Iowa
→1984Cameron, W. S., House — Davenport, Scott County, Iowa
→1995Camp Dodge Pool District — Johnston, Polk County, Iowa
→2013Camp Harlan--Camp McKean Historic District — Mount Pleasant, Henry County, Iowa
→2016Campbell Baking Company — Waterloo, Black Hawk County, Iowa
→2004Cannon, Amaziah and Cornelia (Wait), House — Mason City, Cerro Gordo County, Iowa
→1994Cannon, Wilbur D. and Hattie, House — Iowa City, Johnson County, Iowa
→1979Canton School — Canton, Jackson County, Iowa
→2005Carey, John T. and Marietta (Greek) House — Denison, Crawford County, Iowa
→1977Carnegie Library — Sheldon, O Brien County, Iowa
→1976Carnegie Library Building — Carroll, Carroll County, Iowa
→1983Carnegie-Ellsworth Public Library — Iowa Falls, Hardin County, Iowa
→1975Carnegie-Stout Public Library — Dubuque, Dubuque County, Iowa
→1998Carpenter, James Sansom, House — Des Moines, Polk County, Iowa
→1983Carr, William V., House — Davenport, Scott County, Iowa
→1982Carson, Thomas C., House — Iowa City, Johnson County, Iowa
→1979Carstens Farmstead — Shelby, Pottawattamie County, Iowa
→1976Carter House — Elkader, Clayton County, Iowa
→1998Cascade Bridge — Burlington, Des Moines County, Iowa
→2022Case, Hosea S. and Elizabeth, House — Denmark, Lee County, Iowa
→1982Case, Larnerd, House — Des Moines, Polk County, Iowa
→2003Cass County Court House — Atlantic, Cass County, Iowa
→1982Cassel, Carl and Ulrika Dalander, House — Madrid, Boone County, Iowa
→1998Castle Terrace Historic District — Clinton, Clinton County, Iowa
→1974Catalpa — Greenfield, Adair County, Iowa
→1985Cathedral Historic District — Dubuque, Dubuque County, Iowa
→2013Cathedral Historic District (Boundary Increase) — Dubuque, Dubuque County, Iowa
→1984Cattermole Memorial Library — Fort Madison, Lee County, Iowa
→1982Caulkins, Dr. Martin H., House and Office — Wyoming, Jones County, Iowa
→1977Cavanaugh-Zetek House — Iowa City, Johnson County, Iowa
→1984Cavin, Thomas E., House — Council Bluffs, Pottawattamie County, Iowa
→2006Caviness, Carl L., Post 102, American Legion — Chariton, Lucas County, Iowa
→1984Cawley, James, House — Davenport, Scott County, Iowa
→2003Cedar County Sheriff's House and Jail — Tipton, Cedar County, Iowa
→1977Cedar Falls Ice House — Cedar Falls, Black Hawk County, Iowa
→1997Cedar Falls Independent Order of Odd Fellows — Cedar Falls, Black Hawk County, Iowa
→2016Cedar Falls Post Office — Cedar Falls, Black Hawk County, Iowa
→2014Cedar Rapids Central Fire Station — Cedar Rapids, Linn County, Iowa
→2017Cedar Rapids Milk Condensing Company — Cedar Rapids, Linn County, Iowa
→1982Cedar Rapids Post Office and Public Building — Cedar Rapids, Linn County, Iowa
→2012Cedar Rapids Pump Company Factory and Warehouse — Cedar Rapids, Linn County, Iowa
→2017Cedar Valley Seminary — Osage, Mitchell County, Iowa
→2003Central City Commercial Historic District — Central City, Linn County, Iowa
→1982Central Fire Station — Davenport, Scott County, Iowa
→1983Central Office Building — Davenport, Scott County, Iowa
→1976Central Park--North Main Street Historic District — Charles City, Floyd County, Iowa
→1985Central School — Lake City, Calhoun County, Iowa
→1992Central School — Canton, Jackson County, Iowa
→2012Central Vinton Residential Historic District — Vinton, Benton County, Iowa
→1998Chaffee--Hunter House — Des Moines, Polk County, Iowa
→1998Chain Lakes Bridge — Hiawatha, Linn County, Iowa
→2007Chamberlain, D.S., Building — Des Moines, Polk County, Iowa
→1977Chamberlin, Clarence D., House — Denison, Crawford County, Iowa
→1998Chambers Ford Bridge — Chelsea, Tama County, Iowa
→1990Champlin Memorial Masonic Temple — Boone, Boone County, Iowa
→2002Chapple and Young Block — La Porte City, Black Hawk County, Iowa
→2010Chariton Cemetery Historic District — Chariton, Lucas County, Iowa
→2006Chariton City Hall and Fire Station — Chariton, Lucas County, Iowa
→2005Chariton Free Public Library — Chariton, Lucas County, Iowa
→2006Chariton Herald--Patriot Building — Chariton, Lucas County, Iowa
→2006Chariton Masonic Temple — Chariton, Lucas County, Iowa
→1983Charles City College Hall — Sioux City, Woodbury County, Iowa
→2017Charles City Junior-Senior High School — Charles City, Floyd County, Iowa
→1999Chase, Charles F. and and Ruth, House — Atlantic, Cass County, Iowa
→1972Chautauqua Park — Red Oak, Montgomery County, Iowa
→1990Chautauqua Park Historic District — Des Moines, Polk County, Iowa
→2014Chautauqua Park Historic District — Sac City, Sac County, Iowa
→1976Chautauqua Pavilion — Riverton, Fremont County, Iowa
→2020Cherokee Commercial Historic District — Cherokee, Cherokee County, Iowa
→1985Cherokee Public Library — Cherokee, Cherokee County, Iowa
→1999Cherry Bank — Clinton, Clinton County, Iowa
→1998Cherry Street Bridge — Shell Rock, Butler County, Iowa
→2007Chevra B'nai Yisroel Synagogue — Council Bluffs, Pottawattamie County, Iowa
→1990Chicago & Northwestern Passenger Depot and Baggage Room--Carroll — Carroll, Carroll County, Iowa
→1990Chicago and North Western Office Building/Passenger Depot--Lake City — Lake City, Calhoun County, Iowa
→2003Chicago and North Western Passenger Depot — Wall Lake, Sac County, Iowa
→2009Chicago, Burlington and Quincy Depot — Osceola, Clarke County, Iowa
→1973Chicago, Burlington and Quincy Railroad-Creston Station — Creston, Union County, Iowa
→2002Chicago, Burlington and Quincy Station — Burlington, Des Moines County, Iowa
→1999Chicago, Burlington Northern and Quincy Depot — Red Oak, Montgomery County, Iowa
→2003Chicago, Burlington, and Quincy Freight House--Chariton — Chariton, Lucas County, Iowa
→1997Chicago, Great Western Railroad--Waterloo Frieght Depot — Waterloo, Black Hawk County, Iowa
→1994Chicago, Milwaukee & St. Paul Depot--Jefferson — Jefferson, Greene County, Iowa
→2022Chicago, Milwaukee & St. Paul Narrow Gauge Depot--LaMotte — LaMotte, Jackson County, Iowa
→1976Chicago, Milwaukee and Pacific Railroad-Albert City Station — Albert City, Buena Vista County, Iowa
→1976Chicago, Milwaukee, and St. Paul Railroad-Grafton Station — Grafton, Worth County, Iowa
→1990Chicago, Milwaukee, St. Paul & Pacific Combination Depot--Hornick — Hornick, Woodbury County, Iowa
→1997Chicago, Milwaukee, St. Paul & Pacific Depot-- Delmar — Delmar, Clinton County, Iowa
→1985Chicago, Milwaukee, St. Paul and Pacific Freight House — Davenport, Scott County, Iowa
→1978Chicago, Milwaukee, St. Paul and Pacific Railroad Company Depot — Fayette, Fayette County, Iowa
→1994Chicago, Rock Island & Pacific Railroad Depot — Atlantic, Cass County, Iowa
→1995Chicago, Rock Island & Pacific Railroad Passenger Depot — Council Bluffs, Pottawattamie County, Iowa
→1991Chicago, Rock Island and Pacific Passenger Depot--Pella — Pella, Marion County, Iowa
→1982Chicago, Rock Island and Pacific Railroad Passenger Station — Iowa City, Johnson County, Iowa
→1998Chicago, Rock Island and Pacific Railroad Stone Arch Viaduct — Shelby, Shelby County, Iowa
→1988Chicago, Rock Island and Pacific Railroad--Wilton Depot — Wilton, Muscatine County, Iowa
→1976Chicago, Rock Island and Pacific Railroad-Grinnell Passenger Station — Grinnell, Poweshiek County, Iowa
→1980Chicago,Rock Island and Pacific Railroad: Stuart Passenger Station — Stuart, Adair County, Iowa
→1981Chickasaw County Courthouse — New Hampton, Chickasaw County, Iowa
→1979Chickasaw Octagon House — Chickasaw, Chickasaw County, Iowa
→2000Chief Black Hawk Statue — Lake View, Sac County, Iowa
→1975Chief Wapello's Memorial Park — Agency, Wapello County, Iowa
→1987Christian Petersen Courtyard Sculptures, and Dairy Industry Building — Ames, Story County, Iowa
→1997Christiansen, Jens Otto, House — Elk Horn, Shelby County, Iowa
→1982Church of St. John the Baptist — Burlington, Des Moines County, Iowa
→2000Church of the Saviour Episcopal Church and David Henderson Statue — Clermont, Fayette County, Iowa
→1987Church, Seymour, House — Winterset, Madison County, Iowa
→1991City Hall — Mount Pleasant, Henry County, Iowa
→2007City Hotel — Wheatland, Clinton County, Iowa
→1984City Market — Davenport, Scott County, Iowa
→1972City National Bank Building — Mason City, Cerro Gordo County, Iowa
→1988Civic Center Historic District — Des Moines, Polk County, Iowa
→2012Civilian Conservation Corps--Prisoner of War Recreation Hall — Eldora, Hardin County, Iowa
→2014Clarinda Carnegie Library — Clarinda, Page County, Iowa
→1996Clark House — Iowa City, Johnson County, Iowa
→1986Clark Round Barn — Tyrone, Monroe County, Iowa
→1983Clark-Blackwell House — Muscatine, Muscatine County, Iowa
→1976Clark, Alexander, House — Muscatine, Muscatine County, Iowa
→1977Clark, Gerome, House — Milford, Dickinson County, Iowa
→1980Clarke, James F., House — Fairfield, Jefferson County, Iowa
→1983Claussen, William, House — Davenport, Scott County, Iowa
→1981Clay County Courthouse — Spencer, Clay County, Iowa
→1976Clayton County Courthouse — Elkader, Clayton County, Iowa
→1974Clayton School — Clayton, Clayton County, Iowa
→2023Clear Lake Lake Wall — Clear Lake, Cerro Gordo County, Iowa
→2009Clemens Automobile Company Building — Des Moines, Polk County, Iowa
→1995Clermont Public School — Clermont, Fayette County, Iowa
→1979Clifton — Davenport, Scott County, Iowa
→1981Clinton County Courthouse — Clinton, Clinton County, Iowa
→2012Clinton High School and Public Library — Clinton, Clinton County, Iowa
→1983Clinton Public Library — Clinton, Clinton County, Iowa
→1974Close House — Iowa City, Johnson County, Iowa
→1998CM and StP Railroad Underpass — Washington, Washington County, Iowa
→1998Coal Creek Bridge — Carlisle, Warren County, Iowa
→2006Coal Ridge Baptist Church and Cemetery — Knoxville, Marion County, Iowa
→1974Cody Homestead — McCausland, Scott County, Iowa
→1979Cody Road Historic District — Le Claire, Scott County, Iowa
→1977Coffin, Lorenzo S., Burial Plot — Fort Dodge, Webster County, Iowa
→2018Coffin's Grove Stagecoach House — Manchester, Delaware County, Iowa
→2016Coggon Public School — Coggon, Linn County, Iowa
→1979Coldwater Church of the Brethren — Greene, Butler County, Iowa
→1973College Block Building — Iowa City, Johnson County, Iowa
→1998College Corner Commercial Historic Business District — Des Moines, Polk County, Iowa
→1997College Green Historic District — Iowa City, Johnson County, Iowa
→1976College Hall — Fayette, Fayette County, Iowa
→1983College Square Historic District — Davenport, Scott County, Iowa
→1976Collins House — Davenport, Scott County, Iowa
→2010Collins--Bond House — Salem, Henry County, Iowa
→2012Colonials Club House — Ames, Story County, Iowa
→1984Columbia Avenue Historic District — Davenport, Scott County, Iowa
→1973Columbus Junction School 1882-1920 — Columbus Junction, Louisa County, Iowa
→2001Commercial Hotel — Wapello, Louisa County, Iowa
→2008Community Building — Princeton, Scott County, Iowa
→2000Conant's Cabin and Park — Gladbrook, Tama County, Iowa
→1974Conger, Jonathan Clark, House — Washington, Washington County, Iowa
→1973Congregational Church of Iowa City — Iowa City, Johnson County, Iowa
→1996Conover, Thomas J., House — Oskaloosa, Mahaska County, Iowa
→1998Consistory Building No. 2 — Cedar Rapids, Linn County, Iowa
→1979Cook Farm — Charles City, Floyd County, Iowa
→2010Cook-Johnson House — Salem, Henry County, Iowa
→2014Cook, Clarissa C., Library/Blue Ribbon News Bldg. — Davenport, Scott County, Iowa
→1983Cook, Clarissa, Home for the Friendless — Davenport, Scott County, Iowa
→1980Cooley-Whitney House — Decorah, Winneshiek County, Iowa
→2014Coon Rapids Bridge — Coon Rapids, Carroll County, Iowa
→1997Cooper, George and Margaret, House — Mount Pleasant, Henry County, Iowa
→1991Cooper, George, House — Maquoketa, Jackson County, Iowa
→1984Copeland, George, House — Davenport, Scott County, Iowa
→1974Coralville Public School — Coralville, Johnson County, Iowa
→1977Coralville Union Ecclesiastical Church — Coralville, Johnson County, Iowa
→1985Corbett's/Eby's Mill Bridge — Scotch Grove, Jones County, Iowa
→1984Cork Hill District — Davenport, Scott County, Iowa
→1998Cornelia Lake Bridge — Clarion, Wright County, Iowa
→2022Cornell College-Mount Vernon Historic District — Mount Vernon, Linn County, Iowa
→1991Cornell, W. J. and Nettie J., House — Winterset, Madison County, Iowa
→2012Corning Commercial Historic District — Corning, Adams County, Iowa
→1993Corning Opera House — Corning, Adams County, Iowa
→1976Corpus Christi Church — Fort Dodge, Webster County, Iowa
→1983Cottage at 1514 and 1516 W. Second Street — Davenport, Scott County, Iowa
→1985Cottage at Rock and Dubuque Streets — Solon, Johnson County, Iowa
→2016Cottage Grove Avenue Presbyterian Church — Des Moines, Polk County, Iowa
→1993Cotton Theater — Cedar Falls, Black Hawk County, Iowa
→2023Council Bluffs Federal Building and Post Office — Council Bluffs, Pottawattamie County, Iowa
→1999Council Bluffs Free Public Library — Council Bluffs, Pottawattamie County, Iowa
→2022Council Bluffs Telephone Exchange — Council Bluffs, Pottawattamie County, Iowa
→1998County Line Bridge — Columbus Junction, Louisa County, Iowa
→1998Court Avenue Bridge — Des Moines, Polk County, Iowa
→1998Court Hill Historic District — Ottumwa, Wapello County, Iowa
→1997Courthouse Square Historic District — Centerville, Appanoose County, Iowa
→2006Cowles, George H and Alice Spaulding, House — Osceola, Clarke County, Iowa
→2001Crane Building — Des Moines, Polk County, Iowa
→2023Cranford Apartment Building — Ames, Story County, Iowa
→1976Crapo Park and Arboretum Historic District — Burlington, Des Moines County, Iowa
→1984Craven, J. D., Women's Relief Corps Hall — Macksburg, Madison County, Iowa
→1981Crawford County Courthouse — Denison, Crawford County, Iowa
→1983Crawford House — Des Moines, Polk County, Iowa
→2003Crescent Warehouse Historic District — Davenport, Scott County, Iowa
→1981Cresco Opera House — Cresco, Howard County, Iowa
→1998Cretsinger, John, House — Coon Rapids, Guthrie County, Iowa
→2011Crozier, J.T. and Mollie, House — Chariton, Lucas County, Iowa
→1982Cummins, Albert Baird, House — Des Moines, Polk County, Iowa
→1991Cundill Block — Maquoketa, Jackson County, Iowa
→1998Cunningham Bridge — Bevington, Madison County, Iowa
→1983Currier House — Davenport, Scott County, Iowa
→1998Curtis, Gen. Samuel R., House — Keokuk, Lee County, Iowa
→1979Curtis, George M., House — Clinton, Clinton County, Iowa
→1976Cutler-Donahue Covered Bridge — Winterset, Madison County, Iowa
→1976Czecho Slovakian Association Hall — Iowa City, Johnson County, Iowa
→2000Dahlonega School #1 — Ottumwa, Wapello County, Iowa
→1973Dallas County Courthouse — Adel, Dallas County, Iowa
→1979Dallas County Courthouse (Boundary Increase) — Adel, Dallas County, Iowa
→1997Damour, William and Sue, House — Cedar Rapids, Linn County, Iowa
→2011Danish Lutheran Church — Alta, Buena Vista County, Iowa
→1992Darling, Jay Norwood and Genevieve Pendleton, House — Des Moines, Polk County, Iowa
→2022Darrow, George, Round Barn — Alta Vista, Chickasaw County, Iowa
→1980Darwin, Mary, House — Burlington, Des Moines County, Iowa
→1993Dau, William C. and Hertha, House — Algona, Kossuth County, Iowa
→2018Davenport Bag and Paper Company Building — Davenport, Scott County, Iowa
→2016Davenport Bank and Trust (Boundary Increase) — Davenport, Scott County, Iowa
→1982Davenport City Hall — Davenport, Scott County, Iowa
→1983Davenport Crematorium — Davenport, Scott County, Iowa
→1984Davenport Hose Station No. 3 — Davenport, Scott County, Iowa
→1983Davenport Hotel — Davenport, Scott County, Iowa
→1980Davenport Village — Davenport, Scott County, Iowa
→1984Davenport Water Co. Pumping Station No. 2 — Davenport, Scott County, Iowa
→1999Davidson Building — Sioux City, Woodbury County, Iowa
→1974Davis County Courthouse — Bloomfield, Davis County, Iowa
→1976Davis, Timothy, House — Elkader, Clayton County, Iowa
→1984Davison, Abner, House — Davenport, Scott County, Iowa
→1979Dawley House — Le Claire, Scott County, Iowa
→1981Decatur County Courthouse — Leon, Decatur County, Iowa
→1978Decker House Hotel — Maquoketa, Jackson County, Iowa
→2023Decorah Hospital — Decorah, Winneshiek County, Iowa
→1978Decorah Ice Cave — Decorah, Winneshiek County, Iowa
→2012Decorah Municipal Bathhouse and Swimming Pool — Decorah, Winneshiek County, Iowa
→2001Decorah Woolen Mill — Decorah, Winneshiek County, Iowa
→2001Deering, Nathaniel Cobb and Lucetia Baily, House — Osage, Mitchell County, Iowa
→1992DeFries House, Barn and Carpenter Shop — Andrew, Jackson County, Iowa
→1981Delaware County Courthouse — Manchester, Delaware County, Iowa
→1981Delmar Calaboose — Delmar, Clinton County, Iowa
→2010Delta Upsilon Chapter House — Ames, Story County, Iowa
→1983Democrat Building — Davenport, Scott County, Iowa
→2023Denison Opera House — Denison, Crawford County, Iowa
→1977Denmark Congregational Church — Denmark, Lee County, Iowa
→1988Denny, Professor Charles O., House — Des Moines, Polk County, Iowa
→2004Des Moines Art Center — Des Moines, Polk County, Iowa
→2013Des Moines Building — Des Moines, Polk County, Iowa
→2003Des Moines County Court House — Burlington, Des Moines County, Iowa
→2014Des Moines Fire Department Headquarters--Fire Station No. 1 and Shop Building — Des Moines, Polk County, Iowa
→1998Des Moines River Bridge — Swea City, Kossuth County, Iowa
→2019Des Moines River Bridge — Humbodlt, Humboldt County, Iowa
→1977Des Moines River Locks No. 5 and No. 7 — Bonaparte and Keosauqua, Van Buren County, Iowa
→1985Des Moines Saddlery Company Building — Des Moines, Polk County, Iowa
→2019Des Moines Township #7 — Boone, Boone County, Iowa
→2008Des Moines Western Railway Freight House — Des Moines, Polk County, Iowa
→1984Dessaint, Marie Clare, House — Davenport, Scott County, Iowa
→1975Dexter Community House — Dexter, Dallas County, Iowa
→1977Diamond Jo Boat Store and Office — Dubuque, Dubuque County, Iowa
→1974Dibble House — Eldon, Wapello County, Iowa
→2023Dick’s Diner — Sioux City, Woodbury County, Iowa
→1998Dierks, Peter, House — Clinton, Clinton County, Iowa
→1983Dillon Memorial — Davenport, Scott County, Iowa
→1983Dils-Downer House — Davenport, Scott County, Iowa
→1986Dobbin Round Barn — State Center, Marshall County, Iowa
→1978Dodd, A. B. C., House — Charles City, Floyd County, Iowa
→1980Dodge, Augustus Caesar, House — Burlington, Des Moines County, Iowa
→1966Dodge, Grenville M., House ★ NHL — Council Bluffs, Pottawattamie County, Iowa
→1980Dodge, Ruth Anne, Memorial — Council Bluffs, Pottawattamie County, Iowa
→1990Dolliver Memorial State Park, Entrance Area (Area A) — Lehigh, Webster County, Iowa
→1990Dolliver Memorial State Park, Picnic, Hiking & Maintenance Area (Area B) — Lehigh, Webster County, Iowa
→1992Dominy, John S., House — Sabula, Jackson County, Iowa
→1983Donahue Building — Davenport, Scott County, Iowa
→1982Douglas, George B., House — Cedar Rapids, Linn County, Iowa
→1972Dow House — Dow City, Crawford County, Iowa
→1976Downey Savings Bank — Downey, Cedar County, Iowa
→2019Downey School — Downey, Cedar County, Iowa
→2006Downtown Commercial Historic District — Muscatine, Muscatine County, Iowa
→2003Dows Street Historic District — Ely, Linn County, Iowa
→2000Dowtown Perry Historic District — Perry, Dallas County, Iowa
→1996Dr. Salsbury's Laboratories, Main Office and Production Laboratory Building — Charles City, Floyd County, Iowa
→1997Drake Public Library — Centerville, Appanoose County, Iowa
→1988Drake University Campus Historic District — Des Moines, Polk County, Iowa
→1987Drake, John and Amanda Bigler, House — Winterset, Madison County, Iowa
→1998Dry Run Bridge — Littleport, Clayton County, Iowa
→2006Dubuque Casket Company — Dubuque, Dubuque County, Iowa
→1972Dubuque City Hall — Dubuque, Dubuque County, Iowa
→1971Dubuque County Courthouse — Dubuque, Dubuque County, Iowa
→1972Dubuque County Jail ★ NHL — Dubuque, Dubuque County, Iowa
→1979Dubuque Freight House — Dubuque, Dubuque County, Iowa
→2008Dubuque Millworking Historic District — Dubuque, Dubuque County, Iowa
→2007Dubuque Star Brewery — Dubuque, Dubuque County, Iowa
→2002Dubuque YMCA Building — Dubuque, Dubuque County, Iowa
→1988Dubuque, Julien, Monument — Dubuque, Dubuque County, Iowa
→1993Duff Barn — Winterset, Madison County, Iowa
→2001Dugan's Saloon — Grand Mound, Clinton County, Iowa
→1994Duncan--Duitsman Farm Historic District — George, Lyon County, Iowa
→1987Duncan, John M., House — Winterset, Madison County, Iowa
→1993Dunham, Z. T., Pioneer Stock Farm — Dunlap, Crawford County, Iowa
→1998Dunkerton Bridge — Dunkerton, Black Hawk County, Iowa
→2013Dunleith and Dubuque Bridge — Dubuque, Dubuque County, Iowa
→2013Dunn, William and Phebe C., House — Marion, Linn County, Iowa
→1977Dunsmore House — Waterloo, Black Hawk County, Iowa
→1986Dyas Hexagonal Barn — Bellevue, Jackson County, Iowa
→1991Dyas, George, House — Bellevue, Jackson County, Iowa
→1991Dyas, William, Barn — Bellevue, Jackson County, Iowa
→1977Eagle Grove Public Library — Eagle Grove, Wright County, Iowa
→2009Earle & LeBosquet Block — Des Moines, Polk County, Iowa
→1982Earlham Public School — Earlham, Madison County, Iowa
→1993Early, John and Elizabeth McMurn, House — Earlham, Madison County, Iowa
→1983East 14th Street Historic District — Davenport, Scott County, Iowa
→2000East Amsterdam School — Pella, Marion County, Iowa
→1997East College Street Historic District — Iowa City, Johnson County, Iowa
→1999East Hill House and Carraige House — Riverdale, Scott County, Iowa
→1998East Indian Creek Bridge — Nevada, Story County, Iowa
→2009East Park Band Shell — Mason City, Cerro Gordo County, Iowa
→2020East Soldier River Bridge — Charter Oak, Crawford County, Iowa
→1984Ebeling, Arthur, House — Davenport, Scott County, Iowa
→1984Ebeling, Henry, House — Davenport, Scott County, Iowa
→1984Eckert House — Guttenberg, Clayton County, Iowa
→1986Eckle Round Barn — Shelby, Pottawattamie County, Iowa
→1986Economy Advertising Company — Iowa City, Johnson County, Iowa
→1983Edel, Matthew, Blacksmith Shop and House — Haverhill, Marshall County, Iowa
→1979Edgewood School of Domestic Arts — Iowa Falls, Hardin County, Iowa
→1983Edinger, Edward, House — Davenport, Scott County, Iowa
→2007Edmundson Park Historic District — Oskaloosa, Mahaska County, Iowa
→1978Edwards-Swayze House — Nevada, Story County, Iowa
→2015Edwards, Joseph A. and Lydia A., House — Salem, Henry County, Iowa
→1966Effigy Mounds National Monument — Marquette, Allamakee County, Iowa
→2017Egloff, William C. & Margaret, House — Mason City, Cerro Gordo County, Iowa
→1998Eisenhower Bridge — Milton, Van Buren County, Iowa
→1985Elbert-Bates House — Albia, Monroe County, Iowa
→1996Eldon Carnegie Public Library — Eldon, Wapello County, Iowa
→2009Eldora Downtown Historic District — Eldora, Hardin County, Iowa
→1983Eldora Public Library — Eldora, Hardin County, Iowa
→1998Eldorado Bridge — Eldorado, Fayette County, Iowa
→2019Eldridge Turn--Halle — Eldridge, Scott County, Iowa
→1984Eldridge, D. C., House — Davenport, Scott County, Iowa
→1984Eldridge, Theodore, House — Davenport, Scott County, Iowa
→2008Elgin Block, The — Elgin, Fayette County, Iowa
→2012Elkader Downtown Historic District — Elkader, Clayton County, Iowa
→1976Elkader Keystone Bridge — Elkader, Clayton County, Iowa
→1976Elkader Opera House — Elkader, Clayton County, Iowa
→1982Elks-Rogers Hotel — Clear Lake, Cerro Gordo County, Iowa
→2015Elliott Furniture Company — Des Moines, Polk County, Iowa
→1985Ellis, Evan F., Farmhouse — Bussey, Marion County, Iowa
→2015Ellis, William and Amanda J., Farmstead Historic District — Elliott, Montgomery County, Iowa
→1998Ellsworth Ranch Bridge — Armstrong, Emmet County, Iowa
→1993Ellsworth--Jones Building — Iowa Falls, Hardin County, Iowa
→1975Ellsworth-Porter House — Decorah, Winneshiek County, Iowa
→2006Ely School House — Ely, Linn County, Iowa
→1979Ely's Stone Bridge — Monticello, Jones County, Iowa
→2002Emerson Hough Elementary School — Newton, Jasper County, Iowa
→2004Emerson School — Waterloo, Black Hawk County, Iowa
→1983Emmetsburg Public Library — Emmetsburg, Palo Alto County, Iowa
→1983Engineering Hall — Ames, Story County, Iowa
→2001Englert Theatre — Iowa City, Johnson County, Iowa
→2004Epworth School — Epworth, Dubuque County, Iowa
→2015Equitable Life Insurance Company of Iowa Building — Des Moines, Polk County, Iowa
→1983Ericson Public Library — Boone, Boone County, Iowa
→1993Estes Park Band Shell — Iowa Falls, Hardin County, Iowa
→1983Etzel, John L., House — Clear Lake, Cerro Gordo County, Iowa
→1985Evans Block — Sioux City, Woodbury County, Iowa
→1999Evans Manufacturing Company Building — Cedar Rapids, Linn County, Iowa
→2002Evans, Edward B. and Nettie E., House — Des Moines, Polk County, Iowa
→1987Evans, Henry and Elizabeth Adkinson, House — Winterset, Madison County, Iowa
→1998Eveland Bridge — Oskaloosa, Mahaska County, Iowa
→2018Everett School — Sioux City, Woodbury County, Iowa
→2007Evergreen Ridge Stock Farm Historic District — Fairfield, Jefferson County, Iowa
→1983Everist, H. H., House — Sioux City, Woodbury County, Iowa
→1983Ewert, Ferdinand, Building — Davenport, Scott County, Iowa
→2005Faeth Farmstead and Orchard District — Fort Madison, Lee County, Iowa
→1983Fairfield Public Library — Fairfield, Jefferson County, Iowa
→1992Farm No. 1, Iowa Men's Reformatory — Ahnamosa, Jones County, Iowa
→2001Farmers and Merchants Savings Bank — Grand Mound, Clinton County, Iowa
→2013Farmers Mutual Reinsurance Company Building — Grinnell, Poweshiek County, Iowa
→2010Farmers Savings Bank — Salem, Henry County, Iowa
→2018Farmers' State Bank — Volga, Clayton County, Iowa
→2019Farmhouse, Olmsted Family — Urbandale, Polk County, Iowa
→1979Farwell, S. S., House — Monticello, Jones County, Iowa
→1998Fay, Pliny and Adelia, House — Muscatine, Muscatine County, Iowa
→1981Fayette County Courthouse — West Union, Fayette County, Iowa
→1999Feller, Robert William Andrew, Farmstead — Van Meter, Dallas County, Iowa
→1982Fellows, James C., House — Riceville, Howard County, Iowa
→1978Fenelon Place Elevator — Dubuque, Dubuque County, Iowa
→1984Fennern, Henry P., House — Davenport, Scott County, Iowa
→1983Ficke Block — Davenport, Scott County, Iowa
→1998Fifth Street Bluff Historic District — Ottumwa, Wapello County, Iowa
→1998Fillmore Block — Dows, Wright County, Iowa
→1983Finch, Fred, House — Davenport, Scott County, Iowa
→1978Findley, William, House — Bloomfield, Davis County, Iowa
→1988Fire Station No. 2 — Waterloo, Black Hawk County, Iowa
→1979Fire Station No. 4 — Des Moines, Polk County, Iowa
→2022Firestone District Office and Warehouse — Des Moines, Polk County, Iowa
→1998First Avenue Bridge — Cedar Rapids, Linn County, Iowa
→2020First Avenue East Historic District — Newton, Jasper County, Iowa
→2020First Avenue West Historic District — Newton, Jasper County, Iowa
→1999First Baptist Church of West Union — West Union, Fayette County, Iowa
→1983First Bible Missionary Church — Davenport, Scott County, Iowa
→2007First Christian Church — Pella, Marion County, Iowa
→1997First Church of Christ Scientist — Mason City, Cerro Gordo County, Iowa
→1984First Church of Christ, Scientist — Davenport, Scott County, Iowa
→2017First Church of Christ, Scientist — Cedar Rapids, Linn County, Iowa
→1977First Congregational Church — Garnavillo, Clayton County, Iowa
→1976First Congregational Church — Burlington, Des Moines County, Iowa
→1996First Congregational Church — Eldora, Hardin County, Iowa
→2016First Federal Savings and Loan Association Building — Davenport, Scott County, Iowa
→1978First Johnson County Asylum — Iowa City, Johnson County, Iowa
→1976First Lutheran Church — St. Ansgar, Mitchell County, Iowa
→1978First Methodist Church — Rock Rapids, Lyon County, Iowa
→1984First Methodist Episcopal Church — Des Moines, Polk County, Iowa
→2000First Methodist Episcopal Church — Kensett, Worth County, Iowa
→1985First National Bank — Clinton, Clinton County, Iowa
→1989First National Bank — Boone, Boone County, Iowa
→1991First National Bank — Maquoketa, Jackson County, Iowa
→1991First National Bank — Mount Pleasant, Henry County, Iowa
→1993First National Bank — Iowa Falls, Hardin County, Iowa
→1995First National Bank — Ottumwa, Wapello County, Iowa
→1983First National Bank Building — Davenport, Scott County, Iowa
→2003First National Bank Building — Fort Dodge, Webster County, Iowa
→2018First National Bank of Davenport — Davenport, Scott County, Iowa
→1997First National Bank of Mason City — Mason City, Cerro Gordo County, Iowa
→2023First National Bank of Pomeroy — Pomeroy, Calhoun County, Iowa
→1983First Presbyterian Church — Davenport, Scott County, Iowa
→1977First Presbyterian Church — Muscatine, Muscatine County, Iowa
→2010First Presbyterian Church — West Bend, Palo Alto County, Iowa
→1992First Presbyterian Church of Marion, Iowa — Marion, Linn County, Iowa
→2018First Unitarian Church — Iowa City, Johnson County, Iowa
→2017First United Brethren Church — Toledo, Tama County, Iowa
→2002First United Methodist Church — Chariton, Lucas County, Iowa
→1978First Universalist Church of Cedar Rapids — Cedar Rapids, Linn County, Iowa
→1977First Welsh Congregational Church — Iowa City, Johnson County, Iowa
→1991Fish and Game Pavilion and Aquarium — Des Moines, Polk County, Iowa
→1998Fish Creek Bridge — Salem, Henry County, Iowa
→1997Fisher--Plane Commercial Building — Independence, Buchanan County, Iowa
→2016Fisher, Lewis M., House — Davenport, Scott County, Iowa
→2013Fitch, F.W., Company Historic District — Des Moines, Polk County, Iowa
→2002Fleming Building — Des Moines, Polk County, Iowa
→1993Fleshman, Charles M. and Emma M. Fischer, House — Hawarden, Sioux County, Iowa
→2014Flint River Bridge — Burlington, Des Moines County, Iowa
→1985Floral Hall — Harlan, Shelby County, Iowa
→1976Floral Hall — Tipton, Cedar County, Iowa
→2018Florence Crittenton Home and Maternity Hospital — Sioux City, Woodbury County, Iowa
→2003Floyd County Court House — Charles City, Floyd County, Iowa
→1973Flynn Farm, Mansion, and Barn — Des Moines, Polk County, Iowa
→2016Flynn--Griffin Building — Des Moines, Polk County, Iowa
→1986Fobes Octagon Barn — Lanesboro, Carroll County, Iowa
→1979Foley, John, House — New Hampton, Chickasaw County, Iowa
→1986Ford, Arthur Hillyer, House — Iowa City, Johnson County, Iowa
→1987Ford, W. T., House — Earlham, Madison County, Iowa
→1991Forest Cemetery Entrance — Oskaloosa, Mahaska County, Iowa
→2016Forest City Public Library — Forest City, Winnebago County, Iowa
→1991Former US Post Office Building — Fairfield, Jefferson County, Iowa
→1986Forney, James M., House — Burlington, Des Moines County, Iowa
→1983Forrest Block — Davenport, Scott County, Iowa
→1998Fort Atkinson Bridge — Fort Atkinson, Winneshiek County, Iowa
→1974Fort Des Moines Provisional Army Officer Training School ★ NHL — Des Moines, Polk County, Iowa
→2019Fort Dodge Downtown Historic District — Fort Dodge, Webster County, Iowa
→2015Fort Dodge Junior High School — Fort Dodge, Webster County, Iowa
→2015Fort Dodge Senior High School — Fort Dodge, Webster County, Iowa
→1999Fort Madison Bridge — Fort Madison, Lee County, Iowa
→2007Fort Madison Downtown Commercial Historic District — Fort Madison, Lee County, Iowa
→2008Foster Park Historic District — Le Mars, Plymouth County, Iowa
→1983Foster/Bell House — Ottumwa, Wapello County, Iowa
→2002Four Mounds Estate Historic District — Dubuque, Dubuque County, Iowa
→1995Fourth Street Historic District — Sioux City, Woodbury County, Iowa
→2009Fowler Company Building, The — Waterloo, Black Hawk County, Iowa
→1980Franke, C. F., House — Mason City, Cerro Gordo County, Iowa
→1996Franklin Apartments — Des Moines, Polk County, Iowa
→1976Franklin County Courthouse — Hampton, Franklin County, Iowa
→1991Franklin County G. A. R. Soldiers' Memorial Hall — Hampton, Franklin County, Iowa
→1996Franklin County Sheriff's Residence and Jail — Hampton, Franklin County, Iowa
→1999Franklin Hotel — Strawberry Point, Clayton County, Iowa
→1986Franklin Printing House — Iowa City, Johnson County, Iowa
→2008Franklin Regular Baptist Church — Seymour, Appanoose County, Iowa
→1978Frankville School — Frankville, Winneshiek County, Iowa
→1986Frantz Round Barn — Grand Junction, Greene County, Iowa
→2010Fred Maytag Park Historic District — Newton, Jasper County, Iowa
→1981Fremont County Courthouse — Sidney, Fremont County, Iowa
→1998Fremont Mill Bridge — Anamosa, Jones County, Iowa
→1983French, Alice, House — Davenport, Scott County, Iowa
→1974Frick's Tavern — Davenport, Scott County, Iowa
→1991Fritz Chapel — Bellevue, Jackson County, Iowa
→1984Front Street (River Park Drive) Historic District — Guttenberg, Clayton County, Iowa
→2004Front Street Historic District (Boundary Increase) — Guttenberg, Clayton County, Iowa
→1999Fryer, O.F. and Lulu E., House — Fairfield, Jefferson County, Iowa
→1984Fuerste House — Guttenberg, Clayton County, Iowa
→1998Fuhrman, Mathias C. and Eva B. Crowell, Farm — Independence, Buchanan County, Iowa
→1982Fuller, W. Joseph, House — Muscatine, Muscatine County, Iowa
→1999Fulton, Fred and Rosa, Barn — Selma, Jefferson County, Iowa
→2014G.A.R. Memorial Hall — Algona, Kossuth County, Iowa
→1983Gabbert, William, House — Davenport, Scott County, Iowa
→1978Gabriel, Rees, House — Des Moines, Polk County, Iowa
→1985Gallup, George H., House — Jefferson, Greene County, Iowa
→1979Gamble, James, House — Le Claire, Scott County, Iowa
→1983Gannon, M. V., House — Davenport, Scott County, Iowa
→1983Garland House — Dubuque, Dubuque County, Iowa
→1998Garnavillo Township Bridge — Garnavillo, Clayton County, Iowa
→1998Garnavillo Township Culvert — Garnavillo, Clayton County, Iowa
→2010Garner, J.W., Building — Ottumwa, Wapello County, Iowa
→1999Garretson Outlet Bridge — Whiting, Monona County, Iowa
→2015Garretson, Owen A. and Emma J., House — Salem, Henry County, Iowa
→2009Garst, Roswell and Elizabeth, Farmstead Historic District — Coon Rapids, Guthrie County, Iowa
→1983Gaspard, D. Julius, House — Davenport, Scott County, Iowa
→1979Gehlen House and Barn — St. Donatus, Jackson County, Iowa
→1989GEO. M. VERITY ★ NHL — Keokuk, Lee County, Iowa
→1990Geode State Park, Civilian Conservation Corps Area — Danville, Henry County, Iowa
→1978German Bank — Dubuque, Dubuque County, Iowa
→1991German Bank Building of Walnut, Iowa — Walnut, Pottawattamie County, Iowa
→1979German Evangelical Reformed Church — Newton, Jasper County, Iowa
→1977German Methodist Episcopal Church — Burlington, Des Moines County, Iowa
→1983Germania-Miller/Standard Hotel — Davenport, Scott County, Iowa
→1991Gibbs, E. H., House — Oskaloosa, Mahaska County, Iowa
→1980Gibson, E. R., House — Mason City, Cerro Gordo County, Iowa
→2005Gilbert--Linn Street Historic District — Iowa City, Johnson County, Iowa
→2019Gillette, Guy M. and Rose (Freeman), House — Cherokee, Cherokee County, Iowa
→1998Gilliece Bridge — Bluffton, Winneshiek County, Iowa
→1996Gingrich, Clement B., House — La Porte City, Black Hawk County, Iowa
→1998Gipple's Quarry Bridge — Columbus Junction, Louisa County, Iowa
→1983Glaspell, Isaac, House — Davenport, Scott County, Iowa
→1993Glick--Sower House — Marshalltown, Marshall County, Iowa
→2015Gobble and Heer--Spurgeons Building — Fairfield, Jefferson County, Iowa
→1992Godard, Milton, House — Maquoketa, Jackson County, Iowa
→2000Goddard Bungalow Court Historic District — Des Moines, Polk County, Iowa
→2022Goedert Meat Market — McGregor, Clayton County, Iowa
→1983Goering, Jacob, House — Davenport, Scott County, Iowa
→1994Goldenrod Schoolhouse — Clarinda, Page County, Iowa
→2019Goldfield Bridge — Goldfield, Wright County, Iowa
→1998Goode, Lowry W., and Hattie N., First North Des Moines House — Des Moines, Polk County, Iowa
→2016Goodin Building — Farmington, Van Buren County, Iowa
→1979Goodnow Hall — Grinnell, Poweshiek County, Iowa
→1983Goodrich, William T., House — Davenport, Scott County, Iowa
→2017Gordon--Van Tine Company Historic District — Davenport, Scott County, Iowa
→2011Grace Methodist Episcopal Church — Waterloo, Black Hawk County, Iowa
→1977Gracehill Moravian Church and Cemetery — Washington, Washington County, Iowa
→1986Graceland Cemetery Chapel — Avoca, Pottawattamie County, Iowa
→1980Grand Auditorium and Hotel Block — Story City, Story County, Iowa
→2004Grand Avenue Historic Commercial District — Spencer, Clay County, Iowa
→2001Grand Mound Town Hall and Waterworks Historic District — Grand Mound, Clinton County, Iowa
→2002Grand Opera House — Dubuque, Dubuque County, Iowa
→1998Grand River Bridge — Arispe, Union County, Iowa
→1998Grand River Bridge — Leon, Decatur County, Iowa
→1978Grand View College (Old Main) — Des Moines, Polk County, Iowa
→2011Grandview Park Music Pavilion — Sioux City, Woodbury County, Iowa
→1976Granger House — Marion, Linn County, Iowa
→2002Grant Commercial Historic District — Grant, Montgomery County, Iowa
→2015Grant Vocational High School — Cedar Rapids, Linn County, Iowa
→2003Grant Wood's "Fall Plowing" Rural Historic Landscape District — Viola, Linn County, Iowa
→1988Grant, Douglas and Charlotte, House — Marion, Linn County, Iowa
→2004Great Northern Railway Steam Locomotive No. 1355 and Tender 1451 — Sioux City, Woodbury County, Iowa
→2019Greater Second Street Historic District — Ottumwa, Wapello County, Iowa
→1997Greek Orthodox Church of Saint George — Des Moines, Polk County, Iowa
→2019Green Mill Ford Bridge — Janesville, Bremer County, Iowa
→1978Green, John A., Estate — Anamosa, Jones County, Iowa
→1999Green, William, House — Rochester, Cedar County, Iowa
→1978Greene County Courthouse — Jefferson, Greene County, Iowa
→2001Greenwood Cemetery Chapel — Muscatine, Muscatine County, Iowa
→2013Greenwood Park Plats Historic District — Des Moines, Polk County, Iowa
→1984Grilk, Charles, House — Davenport, Scott County, Iowa
→1986Grimes Octagon Barn — West Union, Fayette County, Iowa
→1991Grinnell Herald Building — Grinnell, Poweshiek County, Iowa
→1991Grinnell Historic Commercial District — Grinnell, Poweshiek County, Iowa
→2013Grinnell Historic District (Boundary Increase) — Grinnell, Poweshiek County, Iowa
→1979Grinnell, Levi P., House — Grinnell, Poweshiek County, Iowa
→1979Griswold National Bank — Griswold, Cass County, Iowa
→2008Grocers Wholesale Company Building — Des Moines, Polk County, Iowa
→2001Grotto of the Redemption — West Bend, Palo Alto County, Iowa
→2020Grundy Center High School — Grundy Center, Grundy County, Iowa
→1981Grundy County Courthouse — Grundy Center, Grundy County, Iowa
→1982Gruwell and Crew General Store — West Branch, Cedar County, Iowa
→1979Guiberson House — Winterset, Madison County, Iowa
→1990Gull Point State Park, Area A — Milford, Dickinson County, Iowa
→1990Gull Point State Park, Area B — Milford, Dickinson County, Iowa
→1984Guttenberg Corn Canning Co. — Guttenberg, Clayton County, Iowa
→1991Guttenberg National Fish Hatchery and Aquarium Historic District — Guttenberg, Clayton County, Iowa
→1984Guttenberg State Bank — Guttenberg, Clayton County, Iowa
→1984Guy, Finley, Building — Davenport, Scott County, Iowa
→1980Haberkorn House and Farmstead — Sherrill, Dubuque County, Iowa
→1985Hager, Otto J., House — Waukon, Allamakee County, Iowa
→1998Hale Bridge — Anamosa, Jones County, Iowa
→1998Haley, F.E., Double House — Des Moines, Polk County, Iowa
→1998Hall, Hannah Morse Fowler, House — Buchanan, Cedar County, Iowa
→1984Hall, Israel, House — Davenport, Scott County, Iowa
→1984Hall, James Norman, House — Colfax, Jasper County, Iowa
→2000Hallett Flat--Rawson & Co. Apartment Building — Des Moines, Polk County, Iowa
→1976Ham, Mathias, House — Dubuque, Dubuque County, Iowa
→1983Hamburg Historic District — Davenport, Scott County, Iowa
→1983Hamburg Public Library — Hamburg, Fremont County, Iowa
→1994Hamilton Brothers Building — Cedar Rapids, Linn County, Iowa
→1998Hammond Bridge — Hamilton, Marion County, Iowa
→2003Hampton Double Square Historic District — Hampton, Franklin County, Iowa
→1981Hancock County Courthouse — Garner, Hancock County, Iowa
→2014Hancock Savings Bank — Hancock, Pottawattamie County, Iowa
→1986Hancock, Charles T., House — Dubuque, Dubuque County, Iowa
→1986Haner, William, Polygonal Barn — Pisgah, Harrison County, Iowa
→1991Hansen, Andrew P., Farmstead — Brayton, Audubon County, Iowa
→1984Hanson, Alfred, House — Oelwein, Fayette County, Iowa
→2016Hardacre Theater — Tipton, Cedar County, Iowa
→1981Hardin County Courthouse — Eldora, Hardin County, Iowa
→2010Hardin County Home Historic District — Eldora, Hardin County, Iowa
→1977Hardware Building — Wadena, Fayette County, Iowa
→1990Harker House — Storm Lake, Buena Vista County, Iowa
→1994Harlan Courthouse Square Commercial District — Harlan, Shelby County, Iowa
→1987Harlan House Hotel — Mount Pleasant, Henry County, Iowa
→1973Harlan-Lincoln House — Mount Pleasant, Henry County, Iowa
→2015Harper and McIntire Company Warehouse — Cedar Rapids, Linn County, Iowa
→1987Harriman, Dr. O. B., House — Hampton, Franklin County, Iowa
→1992Harris Wagon and Carriage Shop — LaMotte, Jackson County, Iowa
→2021Harris, Dr. Percy and Lileah, House — Cedar Rapids, Linn County, Iowa
→1981Harrison County Courthouse — Logan, Harrison County, Iowa
→1984Harrison, E. H., House — Keokuk, Lee County, Iowa
→1980Hart, Charles Walter, House — Charles City, Floyd County, Iowa
→2000Harvat, Emma J., and Mary E. Stach House — Iowa City, Johnson County, Iowa
→1998Harvey Railroad Bridge — Harvey, Marion County, Iowa
→1998Hatton, Dr. John B. and Anna M., House — Des Moines, Polk County, Iowa
→1983Hauschild's Hall — Davenport, Scott County, Iowa
→2009Hawarden City Hall, Fire Station and Auditorium — Hawarden, Sioux County, Iowa
→1998Hawkeye Creek Bridge — Mediapolis, Des Moines County, Iowa
→1986Hawkeye Insurance Company Building — Des Moines, Polk County, Iowa
→1998Hawkeye Street Underpass — Nora Springs, Floyd County, Iowa
→2010Hawkeye Transfer Company Warehouse — Des Moines, Polk County, Iowa
→2014Hawthorne Glove and Novelty Company--Shrader Drug Company Building — Iowa City, Johnson County, Iowa
→1996Hayes, William B., House — Des Moines, Polk County, Iowa
→2014Hayesville Independent School — Hayesville, Keokuk County, Iowa
→1985Haymarket Commercial Historic District — Council Bluffs, Pottawattamie County, Iowa
→1984Hays, E. R., House — Knoxville, Marion County, Iowa
→2004Hazen, Allen, Water Tower — Des Moines, Polk County, Iowa
→1984Hebard, Alfred, House — Red Oak, Montgomery County, Iowa
→1983Hebert, Louis, House — Davenport, Scott County, Iowa
→1982Hedge Block — Burlington, Des Moines County, Iowa
→1983Heinz, Bonaventura, House (second) — Davenport, Scott County, Iowa
→2000Helvig--Olson Farm Historic District — Grand Mound, Clinton County, Iowa
→1987Henderson, Daniel and Nancy Swaford, House — Earlham, Madison County, Iowa
→1983Henn Mansion — Fairfield, Jefferson County, Iowa
→1983Henne, Robert, House — Davenport, Scott County, Iowa
→1981Henry County Courthouse — Mount Pleasant, Henry County, Iowa
→1991Henry County Savings Bank — Mount Pleasant, Henry County, Iowa
→2005Henryson, Henry T. and Emilie (Wiese), House — Story City, Story County, Iowa
→2001Henshie--Briggs Row House — Des Moines, Polk County, Iowa
→2004Henyon--Kasper--Duffy Barn — Solon, Johnson County, Iowa
→1973Hepburn, Col. William Peters, House ★ NHL — Clarinda, Page County, Iowa
→1966Herbert Hoover National Historic Site ★ NHL — West Branch, Cedar County, Iowa
→2013Herbert Hoover National Historic Site (Boundary Increase) — West Branch, Cedar County, Iowa
→1982Heritage Hill Historic District — Burlington, Des Moines County, Iowa
→1989Herman, John H., House — Boone, Boone County, Iowa
→1977Herndon Hall — Des Moines, Polk County, Iowa
→2008Herring Hotel — Belle Plaine, Benton County, Iowa
→2004Herring Motor Car Company Building — Des Moines, Polk County, Iowa
→1998Herrold Bridge — Herrold, Polk County, Iowa
→1986Herschel--Spillman Two-Row Portable Menagerie Carousel — Story City, Story County, Iowa
→1996Herschler, Christian and Katharina, House, Barn and Outbuildings Historic District — Franklin, Lee County, Iowa
→1983Hibernia Hall — Davenport, Scott County, Iowa
→1984Highland Historic District — Waterloo, Black Hawk County, Iowa
→1998Highland Park Historic Business District at Euclid and Sixth Avenues — Des Moines, Polk County, Iowa
→2014Highlandville School — Decorah, Winneshiek County, Iowa
→1977Highwater Rock — Cedar Rapids, Linn County, Iowa
→1974Hiller Building — Davenport, Scott County, Iowa
→1982Hillside — Davenport, Scott County, Iowa
→2011Historic Railroad District — Ottumwa, Wapello County, Iowa
→1977Hitchcock, Rev. George B., House ★ NHL — Lewis, Cass County, Iowa
→1976Hoag, J. J., House — Manchester, Delaware County, Iowa
→2008Hobson Block — West Union, Fayette County, Iowa
→1984Hoersch, John, House — Davenport, Scott County, Iowa
→1983Hoffman Building — Davenport, Scott County, Iowa
→1991Hoffman, Phil, House — Oskaloosa, Mahaska County, Iowa
→1983Hoffman, Samuel, Jr., House — Davenport, Scott County, Iowa
→2010Hofmann Building — Ottumwa, Wapello County, Iowa
→1976Hogback Covered Bridge — Winterset, Madison County, Iowa
→2002Hohberger Building — Des Moines, Polk County, Iowa
→1984Holbrook, William, House — Davenport, Scott County, Iowa
→1992Holdoegel, Perry C. and Mattie Forrest, House — Rockwell City, Calhoun County, Iowa
→1986Holland, Ora, House — Dubuque, Dubuque County, Iowa
→1977Hollenfelz House — Dubuque, Dubuque County, Iowa
→1976Holliwell Covered Bridge — Winterset, Madison County, Iowa
→1987Holmes, John S. and Elizabeth Beem, Barn — St. Charles, Madison County, Iowa
→1986Holtkamp Round Barn — Salem, Henry County, Iowa
→2011Holy Ghost Catholic Historic District — Dubuque, Dubuque County, Iowa
→2019Holy Guardian Angels Church and Cemetery Historic District — Roselle, Carroll County, Iowa
→1998Holy Trinity Greek Orthodox Church — Sioux City, Woodbury County, Iowa
→2017Home Federal Savings and Loan Association of Des Moines Building — Des Moines, Polk County, Iowa
→1998Home of Marshall's Horseradish — Des Moines, Polk County, Iowa
→1982Homestead Building — Des Moines, Polk County, Iowa
→1980Honey Creek Friends' Meetinghouse — New Providence, Hardin County, Iowa
→2011Hoosier Row School — Indianola, Warren County, Iowa
→1983Hope Fire Company Engine House — Toledo, Tama County, Iowa
→1977Horn House — Decorah, Winneshiek County, Iowa
→1987Hornback, Emily, House — Winterset, Madison County, Iowa
→1979Horton-Suiter House — Le Claire, Scott County, Iowa
→1983Hose Station No. 1 — Davenport, Scott County, Iowa
→1983Hose Station No. 6 — Davenport, Scott County, Iowa
→1983Hose Station No. 7 — Davenport, Scott County, Iowa
→1987Hotel Burlington — Burlington, Des Moines County, Iowa
→2006Hotel Charitone — Chariton, Lucas County, Iowa
→2014Hotel Chieftain — Council Bluffs, Pottawattamie County, Iowa
→1982Hotel Fort Des Moines — Des Moines, Polk County, Iowa
→2011Hotel Greenfield — Greenfield, Adair County, Iowa
→1989Hotel Hurst — Maquoketa, Jackson County, Iowa
→1989Hotel Hurst Garage — Maquoketa, Jackson County, Iowa
→1987Hotel Iowa — Keokuk, Lee County, Iowa
→2003Hotel Kirkwood — Des Moines, Polk County, Iowa
→2002Hotel Lester--Lester Cafe — Mason City, Cerro Gordo County, Iowa
→1973Hotel Manning — Keosauqua, Van Buren County, Iowa
→1983Hotel Mealey — Oelwein, Fayette County, Iowa
→1998Hotel Mississippi--RKO Orpheum Theater — Davenport, Scott County, Iowa
→2012Hotel Ottumwa — Ottumwa, Wapello County, Iowa
→2017Hotel President — Waterloo, Black Hawk County, Iowa
→2009Hotel Randolph — Des Moines, Polk County, Iowa
→2020Hotel Rea — Corydon, Wayne County, Iowa
→1991Hotel Roosevelt — Cedar Rapids, Linn County, Iowa
→1988Hotel Russell--Lamson — Waterloo, Black Hawk County, Iowa
→2022Hotel Tipton — Tipton, Cedar County, Iowa
→2016Hotel Whitney — Atlantic, Cass County, Iowa
→1991House at 111 E. Maple Street — Maquoketa, Jackson County, Iowa
→1983House at 1646 W. Second Street — Davenport, Scott County, Iowa
→1983House at 2123 W. Second Street — Davenport, Scott County, Iowa
→1984House at 2212 W. River Drive — Davenport, Scott County, Iowa
→1983House at 318-332 Marquette Street — Davenport, Scott County, Iowa
→1991House at 505 Court Street — Bellevue, Jackson County, Iowa
→1984House at 919 Oneida Street — Davenport, Scott County, Iowa
→1981Howard County Courthouse — Cresco, Howard County, Iowa
→2004Howes Building — Clinton, Clinton County, Iowa
→2023Hubbard Park — Sioux City, Woodbury County, Iowa
→2004Hubbell Building — Des Moines, Polk County, Iowa
→2010Hubbell Warehouse — Des Moines, Polk County, Iowa
→2011Hughes--Irons Motor Company — Council Bluffs, Pottawattamie County, Iowa
→1996Hughes, David and M. Maria, House — Williamsburg, Iowa County, Iowa
→1984Hughes, Martin, House — Council Bluffs, Pottawattamie County, Iowa
→2019Hulme, Samuel and Sarah, House — Trenton, Henry County, Iowa
→1999Hult, Charles E., House, Summer Kitchen and Wood Shed — Swedesburg, Henry County, Iowa
→1999Hultquist, John, House — Swedesburg, Henry County, Iowa
→2003Humboldt County Court House — Dakota City, Humboldt County, Iowa
→1983Humboldt Free Public Library — Humboldt, Humboldt County, Iowa
→2007Hunter School — Tabor, Fremont County, Iowa
→1991Hurst, A. A., House — Maquoketa, Jackson County, Iowa
→1979Hurstville Historic District — Maquoketa, Jackson County, Iowa
→2017I.O.O.F. (International Order of Odd Fellows) Valley Junction Lodge Hall No. 604 — West Des Moines, Polk County, Iowa
→1979I.O.O.F. Hall — Garnavillo, Clayton County, Iowa
→2011I.O.O.F. Hall — Dunlap, Harrison County, Iowa
→1998IANR Railroad Underpass — Cedar Rapids, Linn County, Iowa
→1974Ida County Courthouse — Ida Grove, Ida County, Iowa
→1990Illinois Central Combination Depot--Ackley — Ackley, Hardin County, Iowa
→1990Illinois Central Passenger Depot--Storm Lake — Storm Lake, Buena Vista County, Iowa
→1990Illinois Central Railroad Yard--Cherokee — Cherokee, Cherokee County, Iowa
→1979Imes Covered Bridge — St. Charles, Madison County, Iowa
→1991Immanuel Danish Evangelical Lutheran Church — Kimballton, Audubon County, Iowa
→1998Indian Creek Bridge — Cedar Rapids, Linn County, Iowa
→2017Indianola Carnegie Library — Indianola, Warren County, Iowa
→2002Indianola High School — Indianola, Warren County, Iowa
→2012Ingemann Danish Evangelical Lutheran Church and Cemetery — Moorhead, Monona County, Iowa
→2000Ingersoll Place Plat Historic District — Des Moines, Polk County, Iowa
→1992Insane Asylum at the County Poor Farm — Andrew, Jackson County, Iowa
→1990Interior Telephone Company Building — Grinnell, Poweshiek County, Iowa
→2008Interstate Power Company Building — Dubuque, Dubuque County, Iowa
→1991IOOF Building — Maquoketa, Jackson County, Iowa
→2014Iowa Beta Chapter of Sigma Phi Epsilon — Ames, Story County, Iowa
→1983Iowa Building — Cedar Rapids, Linn County, Iowa
→2012Iowa Canning Company Seed House Building — Vinton, Benton County, Iowa
→2010Iowa Commission for the Blind Building — Des Moines, Polk County, Iowa
→1981Iowa County Courthouse — Marengo, Iowa County, Iowa
→1998Iowa Falls Bridge — Iowa Falls, Hardin County, Iowa
→1990Iowa Falls Union Depot — Iowa Falls, Hardin County, Iowa
→2019Iowa Federation Home for Colored Girls — Iowa City, Johnson County, Iowa
→2021Iowa Ford Tractor Company Repair and Warehouse Building — Des Moines, Polk County, Iowa
→1991Iowa Lakeside Laboratory Historic District — Milford, Dickinson County, Iowa
→1999Iowa Malleable Iron Company — Fairfield, Jefferson County, Iowa
→1992Iowa Men's Reformatory Cemetery — Anamosa, Jones County, Iowa
→1992Iowa Men's Reformatory Historic District — Anamosa, Jones County, Iowa
→1983Iowa Reform Building — Davenport, Scott County, Iowa
→1982Iowa Soldiers' Orphans' Home — Davenport, Scott County, Iowa
→1976Iowa State Capitol — Des Moines, Polk County, Iowa
→1987Iowa State Fair and Exposition Grounds Historic District — Des Moines, Polk County, Iowa
→2017Iowa State Highway Commission, District 6 Building — Cedar Rapids, Linn County, Iowa
→1978Iowa State Historical Building — Des Moines, Polk County, Iowa
→1992Iowa State Penitentiary Cellhouses Historic District — Fort Madison, Lee County, Iowa
→2012Iowa Wind Mill and Pump Company Office and Warehouse — Cedar Rapids, Linn County, Iowa
→1996Iowa Yearly Meeting House--College Avenue Friends Church — Oskaloosa, Mahaska County, Iowa
→1979Iowa-Des Moines National Bank Building — Des Moines, Polk County, Iowa
→2009Iowan's Hotel — Essex, Page County, Iowa
→2009Iowana Hotel — Creston, Union County, Iowa
→1976Iron Post — New Albin, Allamakee County, Iowa
→2002Irwin Consolidated School — Irwin, Shelby County, Iowa
→1999Irwin, John N. and Mary L. (Rankin), House — Keokuk, Lee County, Iowa
→1981Jackson County Courthouse — Bellevue, Jackson County, Iowa
→1978Jackson County Jail — Andrew, Jackson County, Iowa
→1986Jackson Park Historic District — Dubuque, Dubuque County, Iowa
→1982Jackson-Swisher House and Carriage House — Iowa City, Johnson County, Iowa
→1982Jacobson Farm — Decorah, Winneshiek County, Iowa
→1982Jagger-Churchill House — Burlington, Des Moines County, Iowa
→2000Janko, Jan F. and Antonie, Farmstead District — Ely, Linn County, Iowa
→1983Jansen, Theodore, House — Davenport, Scott County, Iowa
→2017Japanese Garden — Muscatine, Muscatine County, Iowa
→1981Jasper County Courthouse — Newton, Jasper County, Iowa
→1995Jay Funeral Home — Ottumwa, Wapello County, Iowa
→1979Jefferis, Thomas, House — Council Bluffs, Pottawattamie County, Iowa
→1981Jefferson County Courthouse — Fairfield, Jefferson County, Iowa
→2002Jefferson Elementary School — Creston, Union County, Iowa
→2022Jefferson Square Commercial Historic District — Jefferson, Greene County, Iowa
→2004Jefferson Street Historic District — Iowa City, Johnson County, Iowa
→1998Jefferson Street Viaduct — Ottumwa, Wapello County, Iowa
→1987Jenkins, Dr. George A., House — Albia, Monroe County, Iowa
→1980Jewell Apartments — Mason City, Cerro Gordo County, Iowa
→1975Johnson County Courthouse — Iowa City, Johnson County, Iowa
→2017Johnson County Savings Bank — Iowa City, Johnson County, Iowa
→1990Johnson, Capt. Nicholas W. and Emma, House — Des Moines, Polk County, Iowa
→2000Johnson, George, House — Calamus, Clinton County, Iowa
→1991Johnson, Mrs. Lydia, House — Maquoketa, Jackson County, Iowa
→1990Johnson, Sylvanus, House — Iowa City, Johnson County, Iowa
→2014Johnson, Thomas, Polygonal Barn — Wellman, Washington County, Iowa
→1996Johnson, William A. and Ida C., House — Oskaloosa, Mahaska County, Iowa
→1996Johnstone, Dr. Anna E. and Andrew A., House — Des Moines, Polk County, Iowa
→2000Jones Business College — Perry, Dallas County, Iowa
→2003Jones County Court House — Anamosa, Jones County, Iowa
→1991Jones Creek Watershed Historic District — Moorhead, Monona County, Iowa
→2016Jones, G.W., Building — Des Moines, Polk County, Iowa
→1973Jordan House — West Des Moines, Polk County, Iowa
→1991Jorgensen, Hans J., Barn — Kimballton, Audubon County, Iowa
→1997Joy, C. R., House — Keokuk, Lee County, Iowa
→1999Julien Dubuque Bridge — Dubuque, Dubuque County, Iowa
→1983Kahl Building — Davenport, Scott County, Iowa
→1983Kahl, Henry, House — Davenport, Scott County, Iowa
→1979Kattenbracher House — Le Claire, Scott County, Iowa
→1978Keck, Joseph, House — Washington, Washington County, Iowa
→1993Keeler, Rev. R. W. and Fannie E., House — Des Moines, Polk County, Iowa
→2002Keerl--Decker House — Mason City, Cerro Gordo County, Iowa
→1985Kegler Gonner Store and Post Office — Springbrook, Jackson County, Iowa
→1998Keigley Branch Bridge — Gilbert, Story County, Iowa
→1978Kelley House — Dubuque, Dubuque County, Iowa
→2017Kellogg, Miles and Elizabeth Smith, House — Winterset, Madison County, Iowa
→1977Kellow House — Cresco, Howard County, Iowa
→1983Kendall Young Public Library — Webster City, Hamilton County, Iowa
→2009Kent Union Chapel and Cemetery — Brooklyn, Poweshiek County, Iowa
→1981Keokuk County Courthouse — Sigourney, Keokuk County, Iowa
→1978Keokuk Lock and Dam — Keokuk, Lee County, Iowa
→1997Keokuk National Cemetery — Keokuk, Lee County, Iowa
→2013Keokuk Union Depot — Keokuk, Lee County, Iowa
→2004Keokuk Young Women's Christian Association Building — Keokuk, Lee County, Iowa
→1979Kerndt G., and Brothers Elevator and Warehouses, No. 11, No.12 and No. 13 — Lansing, Allamakee County, Iowa
→1982Kerndt, G., & Brothers Office Block — Lansing, Allamakee County, Iowa
→1978Kidder, Zephaniah, House — Epworth, Dubuque County, Iowa
→1984Kiene, Albert, House — Davenport, Scott County, Iowa
→1998Kilbourn Bridge — Kilbourn, Van Buren County, Iowa
→1983Kimball-Stevenson House — Davenport, Scott County, Iowa
→1995Kimballton Commercial District — Kimballton, Audubon County, Iowa
→1995Kimballton West 2nd--West 3rd Street Residential District — Kimballton, Audubon County, Iowa
→1976King Memorial Chapel — Mount Vernon, Linn County, Iowa
→2000Kingman Place Historic District — Des Moines, Polk County, Iowa
→1986Kinney Octagon Barn — Burr Oak, Winneshiek County, Iowa
→1993Kirchner, Philip and Anna Parrish, Log House — Peterson, Clay County, Iowa
→1982Kirk, The — Mason City, Cerro Gordo County, Iowa
→1988Kirkham, Francis M., House — Des Moines, Polk County, Iowa
→2005Kirkpatrick, Robert Round Barn — Coggon, Delaware County, Iowa
→1974Kirkwood House — Iowa City, Johnson County, Iowa
→1998Kittyhawk Avenue Bridge — Carroll, Carroll County, Iowa
→1983Klindt, George, House — Davenport, Scott County, Iowa
→1984Klindt, Henry, House — Davenport, Scott County, Iowa
→1998Klondike Bridge — Larchwood, Lyon County, Iowa
→1996Klondike Hotel — Manilla, Crawford County, Iowa
→1996Klose, Dr. William H. and Mae R., House — Oskaloosa, Mahaska County, Iowa
→1966Knapp-Wilson House ★ NHL — Ames, Story County, Iowa
→2020Knott, Adams R., Frederick L. and Martha (Taylor), House — Mount Vernon, Linn County, Iowa
→1999Knott, Dr. Van Buren, House — Sioux City, Woodbury County, Iowa
→1988Knotts, Nellie and Thomas, House — Des Moines, Polk County, Iowa
→2012Knoxville Veterans Administration Hospital Historic District — Knoxville, Marion County, Iowa
→2007Knoxville WPA Athletic Field Historic District — Knoxville, Marion County, Iowa
→1984Koch Drug Store — Davenport, Scott County, Iowa
→1991Koch, Hans M., House — Kimballton, Audubon County, Iowa
→2005Koelman, Philipus J. and Cornelia, House — Pella, Marion County, Iowa
→1983Koenig Building — Davenport, Scott County, Iowa
→1983Koester, Nicholas, Building — Davenport, Scott County, Iowa
→1984Kolker House — Guttenberg, Clayton County, Iowa
→1984Koren Library — Decorah, Winneshiek County, Iowa
→2000Kreinbring Phillips 66 Gas Station — Lowden, Cedar County, Iowa
→1996Kromer Flats — Des Moines, Polk County, Iowa
→1991Kucheman Building — Bellevue, Jackson County, Iowa
→1983Kuhnen, Nicholas J., House — Davenport, Scott County, Iowa
→1977Kurtz House — Washington, Washington County, Iowa
→2014Kurtz, Glenn and Nell, Lustron Home and Garage — Iowa Falls, Hardin County, Iowa
→2000Kvindherred Lutheran Church, School and Cemetery — Calamus, Clinton County, Iowa
→2000Kyte, John and Mary Jane, Farmstead District — Weldon, Clarke County, Iowa
→1979La Porte City Station — La Porte City, Black Hawk County, Iowa
→1990Lacey--Keosauqua State Park, Bathing Area (Area C) — Keosauqua, Van Buren County, Iowa
→1990Lacey--Keosauqua State Park, Lodge and Picnic Area (Area A) — Keosauqua, Van Buren County, Iowa
→1990Lacey--Keosauqua State Park, Picnic and Custodial Group (Area B) — Keosauqua, Van Buren County, Iowa
→1990Ladora Savings Bank — Ladora, Iowa County, Iowa
→2013Lagomarcino--Grupe Company — Burlington, Des Moines County, Iowa
→1990Lake Ahquabi State Park, Bathhouse Area (Area B) — Indianola, Warren County, Iowa
→1990Lake Ahquabi State Park, Picnic Area (Area A) — Indianola, Warren County, Iowa
→1990Lake Ahquabi State Park, Refectory Area (Area C) — Indianola, Warren County, Iowa
→1990Lake City Community Memorial Building — Lake City, Calhoun County, Iowa
→1990Lake City Public Library — Lake City, Calhoun County, Iowa
→1990Lake City Water Standpipe — Lake City, Calhoun County, Iowa
→1990Lake Keomah State Park, Bathhouse--Lodge Area (Area A) — Oskaloosa, Mahaska County, Iowa
→1990Lake Keomah State Park, Erosion Control Area (Area B) — Oskaloosa, Mahaska County, Iowa
→1991Lake, John, House — Maquoketa, Jackson County, Iowa
→2002Lakeside Ballroom — Guttenberg, Clayton County, Iowa
→1991Lakeside Park Historic District — Lake View, Sac County, Iowa
→1979Lamb, Lafayette, House — Clinton, Clinton County, Iowa
→1988Lamberson, Jack, House — Oskaloosa, Mahaska County, Iowa
→2010Lamm-Pollmiller Farmstead District — Salem, Henry County, Iowa
→1984Lancaster School — Sigourney, Keokuk County, Iowa
→1998Land and Loan Office Building — Algona, Kossuth County, Iowa
→1995Lane, Lucius and Maria Clinton, House — Charles City, Floyd County, Iowa
→2002Lane, Samuel M., House — Marion, Linn County, Iowa
→1997Lange, August H. J. and Justena, Farmstead Historic District — La Porte City, Black Hawk County, Iowa
→2004Langworthy Historic District — Dubuque, Dubuque County, Iowa
→1975Langworthy House — Dubuque, Dubuque County, Iowa
→1991Lansing Fisheries Building — Lansing, Allamakee County, Iowa
→2014Lansing Main Street Historic District — Lansing, Allamakee County, Iowa
→1973Lansing Stone School — Lansing, Allamakee County, Iowa
→1977LaPorte City Town Hall and Fire Station — La Porte City, Black Hawk County, Iowa
→1991Larsen, Chris, House — Elk Horn, Shelby County, Iowa
→1991Larsen, Jens T., House — Kimballton, Audubon County, Iowa
→1983Lattner Auditorium Building — Cedar Rapids, Linn County, Iowa
→1974Laurens Carnegie Free Library — Laurens, Pocahontas County, Iowa
→1998Lawrence Bridge — Jackson Junction, Winneshiek County, Iowa
→1998Le Grand Bridge — Le Grand, Marshall County, Iowa
→1998Le Grand Bridge — Le Grand, Tama County, Iowa
→1999Le Mars Central High School — Le Mars, Plymouth County, Iowa
→2012Le Mars Downtown Commercial Historic District — Le Mars, Plymouth County, Iowa
→2001Le Mars Municipal Park and Golf Course Historic District — Le Mars, Plymouth County, Iowa
→1979Le Mars Public Library — Le Mars, Plymouth County, Iowa
→1974LeClaire, Antoine, House — Davenport, Scott County, Iowa
→1976Lee County Courthouse — Fort Madison, Lee County, Iowa
→2010Lee, Captain Daniel S. and Fannie L. (Brooks), House — Independence, Buchanan County, Iowa
→2002Leeds Junior High School — Sioux City, Woodbury County, Iowa
→1999Leet, William A., and Frederick Hassler Farmstead District — Manning, Carroll County, Iowa
→2020Leith, Doctor Alexander R. (A.R.) and Louisa J., House — Wilton, Muscatine County, Iowa
→2014Lend-A-Hand Club — Davenport, Scott County, Iowa
→2002Lenox Hotel — Lenox, Taylor County, Iowa
→1999Lenox Round Barn — Bedford, Taylor County, Iowa
→1983Lenox Township Church of the New Jersalem — Norway, Iowa County, Iowa
→1983Lerch, Gustov C., House — Davenport, Scott County, Iowa
→1997Lesinger Block — Cedar Rapids, Linn County, Iowa
→1982Letovsky-Rohret House — Iowa City, Johnson County, Iowa
→1982Lewelling, Henderson, House — Salem, Henry County, Iowa
→1997Lewis Hotel — Cherokee, Cherokee County, Iowa
→2016Lewis System Armored Car and Detective Service Building — Sioux City, Woodbury County, Iowa
→1976Lexington, The — Des Moines, Polk County, Iowa
→2010Liberty Building — Des Moines, Polk County, Iowa
→1983Liberty Hall — Lamoni, Decatur County, Iowa
→1977Lime Springs Mill Complex — Lime Springs, Howard County, Iowa
→2002Lincoln Elementary School — Manchester, Delaware County, Iowa
→1978Lincoln Highway Bridge — Tama, Tama County, Iowa
→1993Lincoln Highway Marker (2) — Jefferson, Greene County, Iowa
→1993Lincoln Highway--Buttrick's Creek Abandoned Segment — Jefferson, Greene County, Iowa
→1993Lincoln Highway--Buttrick's Creek to Grand Junction Segment — Grand Junction, Greene County, Iowa
→1993Lincoln Highway--Grand Junction Segment — Grand Junction, Greene County, Iowa
→1993Lincoln Highway--Little Beaver Creek Bridge — Grand Junction, Greene County, Iowa
→1993Lincoln Highway--Raccoon River Rural Segment — Jefferson, Greene County, Iowa
→1993Lincoln Highway--West Beaver Creek Abandoned Segment — Grand Junction, Greene County, Iowa
→1993Lincoln Highway--West Greene County Rural Segment — Scranton, Greene County, Iowa
→1996Lincoln Hotel — Lowden, Cedar County, Iowa
→1975Lincoln School — Farley, Dubuque County, Iowa
→1991Lincoln School — Oskaloosa, Mahaska County, Iowa
→2002Lincoln School — Davenport, Scott County, Iowa
→1993Lincoln Statue — Jefferson, Greene County, Iowa
→2007Lincoln Township Mausoleum — Zearing, Story County, Iowa
→2007Lincoln--Fairview Historic District — Council Bluffs, Pottawattamie County, Iowa
→1983Linden Flats — Davenport, Scott County, Iowa
→2003Linden Heights Historic District — Des Moines, Polk County, Iowa
→1984Lindsay, James E., House — Davenport, Scott County, Iowa
→2009Linograph Company Building, The — Davenport, Scott County, Iowa
→1977Linsay House — Iowa City, Johnson County, Iowa
→1980Lippert House — Mason City, Cerro Gordo County, Iowa
→1983Lippincott, John, House — Davenport, Scott County, Iowa
→2015Lisbon Methodist Church — Lisbon, Linn County, Iowa
→1983Littig Brothers/Mengel & Klindt/Eagle Brewery — Davenport, Scott County, Iowa
→1984Littig, John, House — Davenport, Scott County, Iowa
→1998Little Sioux River Bridge — Spencer, Clay County, Iowa
→2004Lock and Dam No. 11 Historic District — Dubuque, Dubuque County, Iowa
→2004Lock and Dam No. 12 Historic District — Bellavue, Jackson County, Iowa
→2004Lock and Dam No. 14 Historic District — Pleasant Valley, Scott County, Iowa
→2004Lock and Dam No. 16 Historic District — Muscatine, Muscatine County, Iowa
→2004Lock and Dam No. 19 Historic District — Keokuk, Lee County, Iowa
→1978Locust School — Decorah, Winneshiek County, Iowa
→1989Loetscher, T. Ben, House — Dubuque, Dubuque County, Iowa
→2001Logan Center School No.5 — Dickens, Clay County, Iowa
→1989LONESTAR ★ NHL — LeClaire, Scott County, Iowa
→1997Long, J. G. and Regina, House — Prairie City, Jasper County, Iowa
→2002Longfellow Historic District — Iowa City, Johnson County, Iowa
→1988Lord, Richard T. C., and William V. Wilcox House — Des Moines, Polk County, Iowa
→1995Loucks Grove Church — Greenfield, Adair County, Iowa
→1999Louden Machinery Company — Fairfield, Jefferson County, Iowa
→1999Louden Monorail System in the Auto Repair Shop — Fairfield, Jefferson County, Iowa
→1999Louden Whirl-Around — Fairfield, Jefferson County, Iowa
→1999Louden, R. B. and Lizzie L., House — Fairfield, Jefferson County, Iowa
→2003Louden, R. Bruce and May W., House — Fairfield, Jefferson County, Iowa
→1999Louden, R.R., and Antoinette, House — Fairfield, Jefferson County, Iowa
→1999Louden, William and Mary Jane, House — Fairfield, Jefferson County, Iowa
→1991Louisa Building — Mount Pleasant, Henry County, Iowa
→1981Louisa County Courthouse — Wapello, Louisa County, Iowa
→1998Lower Road Bridge — Anamosa, Jones County, Iowa
→1992Lu Verne City Jail — Lu Verne, Kossuth County, Iowa
→1992Lubben, Henry, House, Smokehouse and Springhouse — Baldwin, Jackson County, Iowa
→1981Lucas County Courthouse — Chariton, Lucas County, Iowa
→1999Luedtke, August and Vera, Barn — Fairfield, Jefferson County, Iowa
→1984Lueschen, John, House — Davenport, Scott County, Iowa
→2004Lustron Home #02102 — Cedar Rapids, Linn County, Iowa
→2020Lustron House #02437 — Windsor Heights, Polk County, Iowa
→1979Luther College Farm — Decorah, Winneshiek County, Iowa
→1977Lynnville Mill and Dam — Lynnville, Jasper County, Iowa
→1991Lyon Block — Maquoketa, Jackson County, Iowa
→1979Lyon County Courthouse — Rock Rapids, Lyon County, Iowa
→1998Maas Commercial Building — Independence, Buchanan County, Iowa
→1992MacDonald, Gilmour B. and Edith Craig, House — Ames, Story County, Iowa
→2017Mack--International Motor Truck Corporation Building — Des Moines, Polk County, Iowa
→1993Macumber, John Andrew and Sara, Ice House — Winterset, Madison County, Iowa
→1976Madison County Courthouse — Winterset, Madison County, Iowa
→1981Mahaska County Courthouse — Oskaloosa, Mahaska County, Iowa
→1983Mahnke House — Des Moines, Polk County, Iowa
→1999Main Street Bridge — Charles City, Floyd County, Iowa
→1996Maine, The — Des Moines, Polk County, Iowa
→1977Maish House — Des Moines, Polk County, Iowa
→2009Malek Theatre — Independence, Buchanan County, Iowa
→1983Mallet, Joseph, House — Davenport, Scott County, Iowa
→1998Mallory Township Bridge — Osterdock, Clayton County, Iowa
→1997Manatt, William, House — Brooklyn, Poweshiek County, Iowa
→2001Mann School No. 2 — Moorhead, Monona County, Iowa
→2016Manning Water Tower — Manning, Carroll County, Iowa
→2012Manufacturing and Wholesale Historic District — Burlington, Des Moines County, Iowa
→1998Maple View Sanitarium — West Union, Fayette County, Iowa
→1991Maquoketa Caves State Park Historic District — Maquoketa, Jackson County, Iowa
→2006Maquoketa Company--Clinton Machine Company Administration Building — Maquoketa, Jackson County, Iowa
→1989Maquoketa Free Public Library — Maquoketa, Jackson County, Iowa
→1982Marble Rock Bank — Marble Rock, Floyd County, Iowa
→1994Marion Carnegie Public Library — Marion, Linn County, Iowa
→2009Marion Commercial Historic District — Marion, Linn County, Iowa
→1981Marion County Courthouse — Knoxville, Marion County, Iowa
→1974Mars Hill — Ottumwa, Wapello County, Iowa
→1989Marsh Rainbow Arch Bridge — Lake City, Calhoun County, Iowa
→1998Marsh--Place Building — Waterloo, Black Hawk County, Iowa
→1999Marsh, E.A. and Rebecca (Johnson), House — Grinnell, Poweshiek County, Iowa
→1972Marshall County Courthouse — Marshalltown, Marshall County, Iowa
→2002Marshalltown Downtown Historic District — Marshalltown, Marshall County, Iowa
→1982Marston Water Tower — Ames, Story County, Iowa
→1983Martin Hotel — Sioux City, Woodbury County, Iowa
→1984Martin, Abner, House — Mount Zion, Van Buren County, Iowa
→1991Martin, Dr. G. S., House — Maquoketa, Jackson County, Iowa
→1984Martin, S. F., House — Atlantic, Cass County, Iowa
→1998Martin, T.S., and Company — Sioux City, Woodbury County, Iowa
→1983Martzahn, August F., House — Davenport, Scott County, Iowa
→1997Mary Elizabeth Day Nursery — Sioux City, Woodbury County, Iowa
→2004Marycrest College Historic District — Davenport, Scott County, Iowa
→2005Mason City Downtown Historic District — Mason City, Cerro Gordo County, Iowa
→1989Mason City Public Library — Mason City, Cerro Gordo County, Iowa
→2002Mason City YMCA — Mason City, Cerro Gordo County, Iowa
→1973Masonic Opera House — What Cheer, Keokuk County, Iowa
→2016Masonic Temple — Ames, Story County, Iowa
→1996Masonic Temple Building — Stuart, Guthrie County, Iowa
→1997Masonic Temple of Des Moines — Des Moines, Polk County, Iowa
→1991Masonic Temple Theater — Mount Pleasant, Henry County, Iowa
→2011Master Service Station — Waterloo, Black Hawk County, Iowa
→1991Masters Building — Mount Pleasant, Henry County, Iowa
→1998Matsell Bridge — Springville, Linn County, Iowa
→1984Matt-Bahls House — Guttenberg, Clayton County, Iowa
→2009Mattes, Minnie Y. and Frank P., House — Des Moines, Polk County, Iowa
→1978May's Island Historic District — Cedar Rapids, Linn County, Iowa
→1997Maynard Town Hall and Jail — Maynard, Fayette County, Iowa
→1981Maysville Schoolhouse — Hampton, Franklin County, Iowa
→2002MBA (Modern Brotherhood of America) Building — Mason City, Cerro Gordo County, Iowa
→1983McBride-Hickey House — Davenport, Scott County, Iowa
→2011McBride, Charles H. & Theresa H., Bungalow — Shell Rock, Butler County, Iowa
→1979McCaffrey House — Le Claire, Scott County, Iowa
→1991McCandless Building — Mount Pleasant, Henry County, Iowa
→1984McCarthy, Patrick F., House — Davenport, Scott County, Iowa
→2020McCartney, James H. and Mayetta (Degrush), House — Mount Vernon, Linn County, Iowa
→1984McClaine House — Guttenberg, Clayton County, Iowa
→1993McClanahan Block — Iowa Falls, Hardin County, Iowa
→2015McCleery Calendar Factory — Washington, Washington County, Iowa
→1984McClellan Heights Historic Dictrict — Davenport, Scott County, Iowa
→2003McClellan's General Store — New London, Henry County, Iowa
→1990McClung, J. J., House — Garden Grove, Decatur County, Iowa
→1987McColl, Anthony M., House — Woodward, Dallas County, Iowa
→1976McCollister, James, Farmstead — Iowa City, Johnson County, Iowa
→2000McConn, Daniel, Barn — Fort Madison, Lee County, Iowa
→2012McCormick Harvesting Machine Company Building — Council Bluffs, Pottawattamie County, Iowa
→1986McCoy Polygonal Barn — Hepburn, Page County, Iowa
→1993McDonald House — Winterset, Madison County, Iowa
→1977McElhinny House — Fairfield, Jefferson County, Iowa
→1999McGee School — Manchester, Delaware County, Iowa
→2001McGreer, John, Barn and Crib — Donnellson, Lee County, Iowa
→2021McGregor Commercial Historic District — McGregor, Clayton County, Iowa
→1995McHaffey Opera House — Eldon, Wapello County, Iowa
→1985McHarg, Joseph S., House — Davenport, Scott County, Iowa
→1976McHenry, William A., House — Denison, Crawford County, Iowa
→2021McKee Button Company — Muscatine, Muscatine County, Iowa
→1986McKenzie, Erza, Round Barn — Hazleton, Buchanan County, Iowa
→1974McKibben, S. M., House — Muscatine, Muscatine County, Iowa
→2002McKinley Elementary School — Davenport, Scott County, Iowa
→1983McKinney House — Davenport, Scott County, Iowa
→1976McMahon House — Dubuque, Dubuque County, Iowa
→1983McManus House — Davenport, Scott County, Iowa
→1985McMullin, Maj. James W., House — Oskaloosa, Mahaska County, Iowa
→1999McNeill, W.A., House — Oskaloosa, Mahaska County, Iowa
→1987McQuie, Peter and Isabelle McCulloch, Milkhouse — Earlham, Madison County, Iowa
→1994McQuilken, John N. and Mary, House — La Porte City, Black Hawk County, Iowa
→1986McQuilkin, James Greer, Round Barn — Eagle Center, Benton County, Iowa
→1994McWaid, Job A. and Rebecca E., House — Atlantic, Cass County, Iowa
→1984Meadly House — Davenport, Scott County, Iowa
→1979Mears Hall — Grinnell, Poweshiek County, Iowa
→1998Mederville Bridge — Mederville, Clayton County, Iowa
→1983Meek's Flour Mill — Bonaparte, Van Buren County, Iowa
→1986Meier, Fred W., Round Barn — Ludlow, Allamakee County, Iowa
→1983Meiser Drug Store — Davenport, Scott County, Iowa
→1974Melan Bridge — Rock Rapids, Lyon County, Iowa
→2003Melcher, Dennis Melcher, Pottery and House — Danville, Des Moines County, Iowa
→2004Melrose Historic District — Iowa City, Johnson County, Iowa
→2013Memorial Building — Dyersville, Dubuque County, Iowa
→1982Mentzer, Joseph P., House — Marion, Linn County, Iowa
→1976Merchants' National Bank ★ NHL — Grinnell, Poweshiek County, Iowa
→1991Merrero Building — Maquoketa, Jackson County, Iowa
→2009Methodist Deaconess Institute--Esther Hall — Des Moines, Polk County, Iowa
→1975Metropolitan Opera House — Iowa Falls, Hardin County, Iowa
→2021Metz Manufacturing Company — Dubuque, Dubuque County, Iowa
→1990Middlefork Methodist Episcopal Church — Redding, Ringgold County, Iowa
→2000Middlesex Plat Historic District — Des Moines, Polk County, Iowa
→1982Middleton, Dr. George McLelland, House and Garage — Davenport, Scott County, Iowa
→2019Midland Packing Company — Sioux City, Woodbury County, Iowa
→2019Midway Stock Farm Barn — Keosauqua, Van Buren County, Iowa
→1998Mill Creek Bridge — Cherokee, Cherokee County, Iowa
→1998Mill Creek Bridge — Clarence, Cedar County, Iowa
→1998Mill Race Bridge — West Union, Fayette County, Iowa
→1992Mill Rock School — Baldwin, Jackson County, Iowa
→1998Miller Bridge — Winterset, Madison County, Iowa
→1983Miller Building — Davenport, Scott County, Iowa
→1986Miller Round Barn — Sharon Center, Johnson County, Iowa
→1978Miller, Alvin, House — Charles City, Floyd County, Iowa
→1983Miller, F. H., House — Davenport, Scott County, Iowa
→1972Miller, Justice Samuel Freeman, House — Keokuk, Lee County, Iowa
→1976Miller, Norris, House — Decorah, Winneshiek County, Iowa
→1983Miller, Severin, House — Davenport, Scott County, Iowa
→1990Mills Tower Historic District — Iowa Falls, Hardin County, Iowa
→2016Milwaukee and St. Paul Railway Combination Depot — Decorah, Winneshiek County, Iowa
→2015Minburn Railroad Depot — Minburn, Dallas County, Iowa
→1998Minerva Creek Bridge — Clemons, Marshall County, Iowa
→2010Mini-Wakan State Park Historic District — Spirit Lake, Dickinson County, Iowa
→2000Minor, Josias L. and Elizabeth A., Farmstead District — Ely, Linn County, Iowa
→1991Missouri, Iowa & Nebraska Railway Co. Depot--Weldon — Weldon, Decatur County, Iowa
→1977Mitchell County Courthouse — Osage, Mitchell County, Iowa
→1978Mitchell Powerhouse and Dam — Mitchell, Mitchell County, Iowa
→1991Mitchell--Maskrey Mill — Maquoketa, Jackson County, Iowa
→2014Modale School and Masonic Hall — Modale, Harrison County, Iowa
→2006Moeszinger--Marquis Hardware Co. — Clinton, Clinton County, Iowa
→1981Monona County Courthouse — Onawa, Monona County, Iowa
→1998Monona Township Culvert — Luana, Clayton County, Iowa
→1981Monroe County Courthouse — Albia, Monroe County, Iowa
→2015Monroe Elementary School Historic District — Cedar Rapids, Linn County, Iowa
→2022Monsrud Bridge — Waterville, Allamakee County, Iowa
→1973Montauk — Clermont, Fayette County, Iowa
→2012Montezuma Downtown Historic District — Montezuma, Poweshiek County, Iowa
→1981Montgomery County Courthouse — Red Oak, Montgomery County, Iowa
→1992Montgomery County Jail — Red Oak, Montgomery County, Iowa
→1997Moore, Josiah B. and Sara, House — Villisca, Montgomery County, Iowa
→1998Moore's Ford Bridge — Monticello City, Jones County, Iowa
→1974Moorehead Stagecoach Inn — Ida Grove, Ida County, Iowa
→2000Moorhead, Joseph and Clara Amanda H., House — Ely, Linn County, Iowa
→1998Morgan Bridge — Peru, Madison County, Iowa
→1997Morningside College Historic District — Sioux City, Woodbury County, Iowa
→1996Morrill Hall — Ames, Story County, Iowa
→1984Moser Stone House — Guttenberg, Clayton County, Iowa
→1996Moslem Temple — Cedar Rapids, Linn County, Iowa
→1983Motie, Joseph, House — Davenport, Scott County, Iowa
→1977Motor Inn — Elkader, Clayton County, Iowa
→1993Motor Mart Building — Sioux City, Woodbury County, Iowa
→1983Mount Pleasant Public Library — Mount Pleasant, Henry County, Iowa
→1974Mount Saint Bernard Seminary and Barn — Dubuque, Dubuque County, Iowa
→1999Mount Sinai Temple — Sioux City, Woodbury County, Iowa
→1993Mount Vernon Commercial Historic District — Mount Vernon, Linn County, Iowa
→1997Moyce--Steffens House — Fort Madison, Lee County, Iowa
→2004Mulcahy Barn — Colo, Story County, Iowa
→2006Municipal Auditorium — Sioux City, Woodbury County, Iowa
→1977Municipal Building — Des Moines, Polk County, Iowa
→1997Municipal Building — Ames, Story County, Iowa
→1976Munson Building — Independence, Buchanan County, Iowa
→2009Murillo Flats — Des Moines, Polk County, Iowa
→2008Murphy, Thos. D. Co. Factory And Power Plant — Red Oak, Montgomery County, Iowa
→1998Murray General Merchandise Store — Little Sioux, Harrison County, Iowa
→1984Murray, Thomas, House — Davenport, Scott County, Iowa
→1993Muscatine Avenue Moffitt Cottage Historic District — Iowa City, Johnson County, Iowa
→1981Muscatine County Courthouse — Muscatine, Muscatine County, Iowa
→2019Muscatine County Home Dairy Barn — Muscatine, Muscatine County, Iowa
→2004Mylius--Eaton House — Sioux City, Woodbury County, Iowa
→2009National Biscuit Company Building — Des Moines, Polk County, Iowa
→1991National State Bank — Mount Pleasant, Henry County, Iowa
→1974Naylor House — Des Moines, Polk County, Iowa
→1986Nebergall "Knoll Crest" Round Barn — Blue Grass, Scott County, Iowa
→1984Neessen, Chris, House — Wellsburg, Grundy County, Iowa
→1986Nelson Round Barn — Allerton, Wayne County, Iowa
→1974Nelson, Daniel, House and Barn — Oskaloosa, Mahaska County, Iowa
→2007Netcott--Pfeiffer House — Parkersburg, Butler County, Iowa
→2003Nevada Downtown Historic District — Nevada, Story County, Iowa
→1979New Carroll House Hotel — Montezuma, Poweshiek County, Iowa
→1991New Era Building — Maquoketa, Jackson County, Iowa
→1996New Lawn, The — Des Moines, Polk County, Iowa
→2000New Orpheum Theatre — Sioux City, Woodbury County, Iowa
→2016New Providence Building Association Stores — New Providence, Hardin County, Iowa
→1996New Providence School Gymnasium — New Providence, Hardin County, Iowa
→1977New Sweden Chapel — Fairfield, Jefferson County, Iowa
→1983Newcome, Daniel T., Double House — Davenport, Scott County, Iowa
→2022Newell, James, Barn — Cedar Falls, Black Hawk County, Iowa
→2003Newens Sanitary Dairy Historic District — Des Moines, Polk County, Iowa
→1983Newhall, Lucian, House — Davenport, Scott County, Iowa
→2000Newton, James P., House and Maid Cottage — Sioux City, Woodbury County, Iowa
→1983Nichols, Oscar, House — Davenport, Scott County, Iowa
→1978Nichols, Samuel, House — Nichols, Muscatine County, Iowa
→1987Nichols, William Anzi, House — Winterset, Madison County, Iowa
→1975Nicking House — Iowa City, Johnson County, Iowa
→2017Nicolaus, Henry E. and Ella M. (Knott), House — Wilton, Muscatine County, Iowa
→1984Nieland House — Guttenberg, Clayton County, Iowa
→1991Niemann, Theodore, House and Spring House — Bellevue, Jackson County, Iowa
→1984Nighswander, Benjamin, House — Davenport, Scott County, Iowa
→2001Nishnabotna Ferry House — Lewis, Cass County, Iowa
→1998Nishnabotna River Bridge — Henderson, Mills County, Iowa
→1998Nishnabotna River Bridge — Manilla, Crawford County, Iowa
→1999Nishnabotna River Bridge — Manilla, Crawford County, Iowa
→1984Noble-Kendall House — Albia, Monroe County, Iowa
→1998Nodaway River Bridge — Grant, Montgomery County, Iowa
→1988Norman Apartment Building — Des Moines, Polk County, Iowa
→1980Norris, F. M., House — Mason City, Cerro Gordo County, Iowa
→2010North Fellows Historic District — Ottumwa, Wapello County, Iowa
→2008North Grinnell Historic District — Grinnell, Poweshiek County, Iowa
→1973North Presbyterian Church — Iowa City, Johnson County, Iowa
→1977North River Stone Schoolhouse — Winterset, Madison County, Iowa
→1998North Skunk River Bridge — New Sharon, Mahaska County, Iowa
→1984Northwest Davenport Savings Bank — Davenport, Scott County, Iowa
→1979Northwest Davenport Turner Society Hall — Davenport, Scott County, Iowa
→1984Northwestern Hotel — Des Moines, Polk County, Iowa
→2006Northwood Central Avenue Historic District — Northwood, Worth County, Iowa
→2004Norton, Charles Henry and Charlotte, House — Avoca, Pottawattamie County, Iowa
→1986Nus, August, Polygonal Barn — Arlington, Fayette County, Iowa
→1981O'Brien County Courthouse — Primghar, O Brien County, Iowa
→2013Oak Hill Cemetery Historic District — Cedar Rapids, Linn County, Iowa
→1977Oak Hill Historic District — Fort Dodge, Webster County, Iowa
→1984Oak Lane Historic District — Davenport, Scott County, Iowa
→1978Oakes-Wood House — Iowa City, Johnson County, Iowa
→2000Oakland Cemetery — Fort Dodge, Webster County, Iowa
→1998Oakland Mills Bridge — Oakland Mills State Park, Henry County, Iowa
→1986Oakland, William, Round Barn — Blairsburg, Hamilton County, Iowa
→1996Oaklands, The, Historic District — Des Moines, Polk County, Iowa
→1984Ockershausen, Henry, House — Davenport, Scott County, Iowa
→1986Octagon Barn, Otter Township — Milo, Warren County, Iowa
→1986Octagon Barn, Richland Township — Jamaica, Guthrie County, Iowa
→1986Octagon Round Barn, Indian Creek Township — Iowa Center, Story County, Iowa
→2014Odd Fellows Block — Afton, Union County, Iowa
→1985Odd Fellows Hall — Troy Mills, Linn County, Iowa
→1985Odd Fellows Hall — Monticello, Jones County, Iowa
→2022Odell, Noah, House — Nodaway, Adams County, Iowa
→1988Odenweller, F. F.--James P. and Nettie Morey House — Des Moines, Polk County, Iowa
→1987Ogburn, William, House — East Peru, Madison County, Iowa
→1998Okoboji Bridge — Milford, Dickinson County, Iowa
→1983Old Allamakee County Courthouse — Lansing, Allamakee County, Iowa
→1972Old Capitol ★ NHL — Iowa City, Johnson County, Iowa
→1983Old Chapel Hall — Dubuque, Dubuque County, Iowa
→1983Old City Hall — Davenport, Scott County, Iowa
→1983Old East Paint Creek Lutheran Church — Waterville, Allamakee County, Iowa
→2013Old Fourth Ward Southeast Historic District — Waverly, Bremer County, Iowa
→1983Old Harrison County Courthouse — Magnolia, Harrison County, Iowa
→1974Old Jail — Muscatine, Muscatine County, Iowa
→1974Old Lenox College — Hopkinton, Delaware County, Iowa
→1973Old Main — Mount Pleasant, Henry County, Iowa
→1983Old Main Historic District — Dubuque, Dubuque County, Iowa
→1979Old Mill House — Le Claire, Scott County, Iowa
→1979Old Post Office — Iowa City, Johnson County, Iowa
→2013Old Settlers' Association of Johnson County Cabins — Iowa City, Johnson County, Iowa
→1986Old Settlers' Association Park and Rhodham Bonnifield House — Fairfield, Jefferson County, Iowa
→2004Old Town Historic District — Ames, Story County, Iowa
→1981Old Worth County Courthouse — Northwood, Worth County, Iowa
→2003Oleson Park Music Pavilion — Fort Dodge, Webster County, Iowa
→1998Olympic Avenue Bridge — Carroll, Carroll County, Iowa
→1990Onawa IOOF Opera House — Onawa, Monona County, Iowa
→1979Onawa Public Library — Onawa, Monona County, Iowa
→1991Organ, Alexander, House — Maquoketa, Jackson County, Iowa
→1977Ormsby-Kelly House — Emmetsburg, Palo Alto County, Iowa
→1972Orpheum Theatre and Site — Dubuque, Dubuque County, Iowa
→2002Osage Commercial Historic District — Osage, Mitchell County, Iowa
→1997Osborne, Edmund B., House — Red Oak, Montgomery County, Iowa
→1981Osceola County Courthouse — Sibley, Osceola County, Iowa
→2010Osceola Masonic Block — Osceola, Clarke County, Iowa
→1991Oskaloosa City Hall — Oskaloosa, Mahaska County, Iowa
→1983Oskaloosa City Park and Band Stand — Oskaloosa, Mahaska County, Iowa
→1986Oskaloosa City Square Commercial Historic District — Oskaloosa, Mahaska County, Iowa
→1991Oskaloosa Fire Station — Oskaloosa, Mahaska County, Iowa
→1996Oskaloosa Monthly Meeting of Friends Parsonage — Oskaloosa, Mahaska County, Iowa
→2020Oskaloosa Post Office — Oskaloosa, Mahaska County, Iowa
→1991Oskaloosa Public Library — Oskaloosa, Mahaska County, Iowa
→1979Ossian Opera House — Ossian, Winneshiek County, Iowa
→2020Otranto Bridge — St. Ansgar, Mitchell County, Iowa
→1998Otter Creek Bridge — Oelwein, Fayette County, Iowa
→1995Ottumwa Cemetery Historic District — Ottumwa, Wapello County, Iowa
→1984Ottumwa Public Library — Ottumwa, Wapello County, Iowa
→2005Ottumwa Young Women's Christian Association — Ottumwa, Wapello County, Iowa
→2015Our Mother of Sorrows Grotto Historic District — Cedar Rapids, Linn County, Iowa
→1977Outing Club — Davenport, Scott County, Iowa
→2007Oversen, Julius and Anine House — Sioux City, Woodbury County, Iowa
→1978Owl's Head Historic District — Des Moines, Polk County, Iowa
→1997Oxford Commercial Historic District — Oxford, Johnson County, Iowa
→1981Page County Courthouse — Clarinda, Page County, Iowa
→1983Pahl, Henry, House — Davenport, Scott County, Iowa
→2022Paine, Samuel and Mercy, House — Bentonsport, Van Buren County, Iowa
→1974Painter-Bernatz Mill — Decorah, Winneshiek County, Iowa
→1984Palmer, B. J., House — Davenport, Scott County, Iowa
→1979Palmyra Methodist Episcopal Church — Palmyra, Warren County, Iowa
→1991Paradise Block Historic District — Oskaloosa, Mahaska County, Iowa
→1977Paradise Farm — Bellevue, Jackson County, Iowa
→1976Paramount Theater Building — Cedar Rapids, Linn County, Iowa
→2017Park Hotel — Sac City, Sac County, Iowa
→1978Park House Hotel — Iowa City, Johnson County, Iowa
→1972Park Inn Hotel — Mason City, Cerro Gordo County, Iowa
→2000Park Motel — Denison, Crawford County, Iowa
→2010Park/Glen Avenues Historic District — Council Bluffs, Pottawattamie County, Iowa
→1984Parker House — Guttenberg, Clayton County, Iowa
→1998Parker's Opera House — Mason City, Cerro Gordo County, Iowa
→1980Parr, Charles Henry, House — Charles City, Floyd County, Iowa
→1986Paul--Helen Building — Iowa City, Johnson County, Iowa
→1983Paulsen, Peter J., House — Davenport, Scott County, Iowa
→1983Paustian, Henry, House — Davenport, Scott County, Iowa
→1979Payne, O. E., House — Chariton, Lucas County, Iowa
→1978Peak, George B., House — Des Moines, Polk County, Iowa
→1978Pearson, Franklin, House — Keosauqua, Van Buren County, Iowa
→2020Pease, Dr. Luther L. and Susette E. (Baker), House — Mount Vernon, Linn County, Iowa
→1978Peirce, John, House — Sioux City, Woodbury County, Iowa
→2020Pella High School — Pella, Marion County, Iowa
→1992Pella Opera House — Pella, Marion County, Iowa
→1996Penn College Historic District — Oskaloosa, Mahaska County, Iowa
→1978Pentacrest — Iowa City, Johnson County, Iowa
→1978People's Savings Bank — Cedar Rapids, Linn County, Iowa
→2010Peoples Nationals Bank — Pella, Marion County, Iowa
→1991Perham House — Maquoketa, Jackson County, Iowa
→2002Perkins, Charles W. and Nellie, House — Cedar Rapids, Linn County, Iowa
→2016Perkins, George and Lola, House — Sac City, Sac County, Iowa
→1994Perrigo-Holmes House — Boone, Boone County, Iowa
→1996Perry and Brainard Block — Des Moines, Polk County, Iowa
→1996Perry Carnegie Library Building — Perry, Dallas County, Iowa
→1983Perry, T. B., House — Albia, Monroe County, Iowa
→1984Peters, J. C., House — Davenport, Scott County, Iowa
→1984Peters' Barber Shop — Davenport, Scott County, Iowa
→1979Petersen, Max, House — Davenport, Scott County, Iowa
→1983Petersen, W. D., Memorial Music Pavillion — Davenport, Scott County, Iowa
→1983Petersen's, J. H. C., Sons Store — Davenport, Scott County, Iowa
→2014Petersen's, J. H. C., Sons Wholesale Building — Davenport, Scott County, Iowa
→1997Peterson Manufacturing Building — New London, Henry County, Iowa
→1984Picklum, Frank, House — Davenport, Scott County, Iowa
→1983Pierce School No. 13 — Davenport, Scott County, Iowa
→1996Pierson--Betts House — Oskaloosa, Mahaska County, Iowa
→1990Pikes Point State Park Shelter and Steps — Spirit Lake, Dickinson County, Iowa
→1993Pillsbury Point State Park — Arnolds Park, Dickinson County, Iowa
→1977Pilot Grove — Williamsburg, Iowa County, Iowa
→1990Pilot Knob State Park, Amphitheater (Area 4) — Forest City, Hancock County, Iowa
→1990Pilot Knob State Park, Observation Tower (Area 2) — Forest City, Hancock County, Iowa
→1990Pilot Knob State Park, Picnic Shelter (Area 3) — Forest City, Hancock County, Iowa
→1990Pilot Knob State Park, Portals (Area 5a) — Forest City, Hancock County, Iowa
→1990Pilot Knob State Park, Trail Area (Area 6a--6c) — Forest City, Hancock County, Iowa
→1995Pilot Knob State Park: Portals in Area 5b — Forest City, Hancock County, Iowa
→1996Pilotburg Church — Wellman, Washington County, Iowa
→1979Pine Creek Gristmill — Muscatine, Muscatine County, Iowa
→1998Pine Mill Bridge — Muscatine, Muscatine County, Iowa
→2003Pine Mills German Methodist Episcopal Church — Muscatine, Muscatine County, Iowa
→2008Pioneer Implement Company — Council Bluffs, Pottawattamie County, Iowa
→2013Pioneer Oil Company Filling Station — Grinnell, Poweshiek County, Iowa
→1986Plagmann Round Barn — Conroy, Iowa County, Iowa
→1984Plambeck, Joachim, House — Davenport, Scott County, Iowa
→1999Plane, Robert R., and Julia L., House — Independence, Buchanan County, Iowa
→2010Pleasant Grove Community Church and Cemetery — Ames, Story County, Iowa
→2017Pleasant Grove Presbyterian Church — Chatham, Buchanan County, Iowa
→1975Pleasant Hill School — Lineville, Wayne County, Iowa
→1987Pleasant Lawn School Historic District — Mt. Pleasant, Henry County, Iowa
→1973Plum Grove — Iowa City, Johnson County, Iowa
→1981Plymouth County Courthouse — Le Mars, Plymouth County, Iowa
→2015Plymouth Place — Des Moines, Polk County, Iowa
→1981Pocahontas County Courthouse — Pocahontas, Pocahontas County, Iowa
→2000Podhajsky--Jansa Farmstead District — Ely, Linn County, Iowa
→1984Pohlmann, Elizabeth, House — Davenport, Scott County, Iowa
→1984Pohlmann, Henry, House — Davenport, Scott County, Iowa
→1991Poldberg, Chris, Farmstead — Jacksonville, Shelby County, Iowa
→1979Polk County Courthouse — Des Moines, Polk County, Iowa
→1983Polled Hereford Breed Origin Site — Indianola, Warren County, Iowa
→1986Polygonal Barn, Lincoln Township — West Liberty, Johnson County, Iowa
→1986Polygonal Barn, New Oregon Township — Cresco, Howard County, Iowa
→1986Polygonal Barn, Van Buren Township — Van Buren, Jackson County, Iowa
→1971Pony Creek Park — Glenwood, Mills County, Iowa
→1992Poplar Rural District — Jacksonville, Audubon County, Iowa
→1980Porter Hall — Centerville, Appanoose County, Iowa
→2003Porter--Rhynsburger House — Pella, Marion County, Iowa
→1972Pottawattamie County Jail — Council Bluffs, Pottawattamie County, Iowa
→1981Pottawattamie County Sub Courthouse — Avoca, Pottawattamie County, Iowa
→1984Potter-Williams House — Davenport, Scott County, Iowa
→1984Potter's, E. G., Jasper Flour Mill — Bellevue, Jackson County, Iowa
→1981Poweshiek County Courthouse — Montezuma, Poweshiek County, Iowa
→2004Prairie Center Methodist Episcopal Church and Pleasand Hill Cemetery — Yale, Dallas County, Iowa
→2019Prairie Grove School — W. Burlington, Des Moines County, Iowa
→1983Pratt, A. W., House — Iowa City, Johnson County, Iowa
→2022Presbyterian Church — West Point, Lee County, Iowa
→1996President's Cottage — Oskaloosa, Mahaska County, Iowa
→2020Preston’s Station Historic District — Belle Plaine, Benton County, Iowa
→1983Price, Hiram/Henry Vollmer House — Davenport, Scott County, Iowa
→1976Price, Rialto, House — Elkader, Clayton County, Iowa
→1983Prien Building — Davenport, Scott County, Iowa
→2017Priester Building, The — Davenport, Scott County, Iowa
→1983Primrose Mill — Primrose, Lee County, Iowa
→1993Princess--Sweet Shop — Iowa Falls, Hardin County, Iowa
→1984Prospect Park Historic District — Davenport, Scott County, Iowa
→1998Prospect Park Second Plat Historic District — Des Moines, Polk County, Iowa
→1977Public Library of Des Moines — Des Moines, Polk County, Iowa
→1999Public Square Historic District — Sigourney, Keokuk County, Iowa
→2002Pucker Street Historic District — Marion, Linn County, Iowa
→1996Purdy, Eliphalet W. and Catherine E. Jaquish, House — Independence, Buchanan County, Iowa
→2011Putnam--Parker Block — Davenport, Scott County, Iowa
→2002Pyle, Glenn O. and Lucy O., House — Marion, Linn County, Iowa
→1998Quail Avenue Bridge — Carroll, Carroll County, Iowa
→1998Quarry Bridge — Marshalltown, Marshall County, Iowa
→1994Quasdorf Blacksmith and Wagon Shop — Dows, Wright County, Iowa
→1987Queen, Hogan and Martha A. Runkle, House — St. Charles, Madison County, Iowa
→1984Quickel, Jacob, House — Davenport, Scott County, Iowa
→1984Radcliff, Willam, House — Davenport, Scott County, Iowa
→1983Raible, F. J., House — Davenport, Scott County, Iowa
→1979Rambo House — Le Claire, Scott County, Iowa
→2012Ranshaw, Samuel and Emma A., House — North Liberty, Johnson County, Iowa
→1983Ranzow-Sander House — Davenport, Scott County, Iowa
→1983Raphael, Jacob, Building — Davenport, Scott County, Iowa
→2008Rath Packing Company Administration Building — Waterloo, Black Hawk County, Iowa
→1977Rath, Johann Christian Frederick, House — Dubuque, Dubuque County, Iowa
→1982Ray, Frank G., House & Carriage House — Vinton, Benton County, Iowa
→1985Raymond, P. P., House — Malcom, Poweshiek County, Iowa
→1999Read Township Culvert — Elkader, Clayton County, Iowa
→1986Reburn, Thomas, Polygonal Barn — New Albin, Allamakee County, Iowa
→2002Rector, Jason and Elizabeth Baylor, House — Thurman, Fremont County, Iowa
→1999Red Ball Garage — Swedesburg, Henry County, Iowa
→1998Red Bridge — Monroe, Jasper County, Iowa
→1998Red Bridge — Postville, Allamakee County, Iowa
→2006Red Oak Firehouse and City Jail — Red Oak, Montgomery County, Iowa
→2010Red Oak Grove Presbyterian Church and Cemetery — Tipton, Cedar County, Iowa
→2020Red Oak High School — Red Oak, Montgomery County, Iowa
→1983Red Oak Public Library — Red Oak, Montgomery County, Iowa
→2001Redmond Park--Grande Avenue Historic District — Cedar Rapids, Linn County, Iowa
→1976Redstone — Dubuque, Dubuque County, Iowa
→1990Reeve Electric Association Plant — Hampton, Franklin County, Iowa
→1979Reeve, Leander, House — Hampton, Franklin County, Iowa
→2020Reeves Farmstead Historic District — LeMars, Plymouth County, Iowa
→2010Reeves, Isaac and Agnes (Bells), House — Salem, Henry County, Iowa
→1994Regina Coeli Monastery — Bettendorf, Scott County, Iowa
→2016Register and Tribune Building — Des Moines, Polk County, Iowa
→1991Reichert, John Christian and Bertha Landrock, House — Tipton, Cedar County, Iowa
→2014Renken, Renke and Wubke, House — Parkersburg, Butler County, Iowa
→1983Renwick Building — Davenport, Scott County, Iowa
→1995Renwick Generating Plant — Renwick, Humboldt County, Iowa
→1983Renwick House — Davenport, Scott County, Iowa
→1982Reverend Little's Young Ladies Seminary — Council Bluffs, Pottawattamie County, Iowa
→1991Rewerts, George, House — Defiance, Shelby County, Iowa
→1988Reynolds, Anson O., House — Des Moines, Polk County, Iowa
→1999Reynolds, Charles B., Round Barn — Doon, Lyon County, Iowa
→1982Reynolds, Joseph "Diamond Jo," Office Building and House — McGregor, Clayton County, Iowa
→1978Rhodes Mill — Fertile, Worth County, Iowa
→1985Richardson-Jakway House — Aurora, Buchanan County, Iowa
→1999Rick's Brewery — Anamosa, Jones County, Iowa
→1979Ricker, B. J., House — Grinnell, Poweshiek County, Iowa
→1988Riekenberg, J. H., House — Boone, Boone County, Iowa
→2014Riepe Drug Store/G. Ott Block — Davenport, Scott County, Iowa
→1981Ringgold County Courthouse — Mount Ayr, Ringgold County, Iowa
→1979Ringgold County Jail — Mount Ayr, Ringgold County, Iowa
→1979Rittenmeyer, F. X., House — Iowa City, Johnson County, Iowa
→1998River Street Bridge — Iowa Falls, Hardin County, Iowa
→1998River Street Bridge — Marble Rock, Floyd County, Iowa
→1996Riverview Park Plat Historic District — Des Moines, Polk County, Iowa
→1984Riverview Terrace Historic District — Davenport, Scott County, Iowa
→1991Robb House and Spring House — Bellevue, Jackson County, Iowa
→1986Roberts Octagon Barn — Sharon Center, Johnson County, Iowa
→1984Roberts, Edward C., House — Davenport, Scott County, Iowa
→1998Robin Avenue Bridge — Carroll, Carroll County, Iowa
→2020Robinson, George W. and Mary J. (Maxwell), House — Mount Vernon, Linn County, Iowa
→1979Rock Crest-Rock Glen Historic District — Mason City, Cerro Gordo County, Iowa
→2016Rock Crest-Rock Glen Historic District (Boundary Decrease) — Mason City, Cerro Gordo County, Iowa
→1998Rock Falls Bridge — Rock Falls, Cerro Gordo County, Iowa
→1989Rock Island Passenger Depot — Oskaloosa, Mahaska County, Iowa
→1983Rockford Mill — Rockford, Floyd County, Iowa
→1998Rockwell City Bridge — Rockwell City, Calhoun County, Iowa
→1982Rogers-Knutson House — Clear Lake, Cerro Gordo County, Iowa
→1976Rogers, George W. Company Shot Tower — Dubuque, Dubuque County, Iowa
→1991Roling, Henry, House — Bellevue, Jackson County, Iowa
→1978Rollins, Ralph, House — Des Moines, Polk County, Iowa
→1980Romey, George, House — Mason City, Cerro Gordo County, Iowa
→2004Roosevelt Elementary School — Waterloo, Black Hawk County, Iowa
→2010Roosevelt School — Ames, Story County, Iowa
→1992Rose Hill — Iowa City, Johnson County, Iowa
→2002Rose Hill Historic District — Sioux City, Woodbury County, Iowa
→2003Rose Hill Methodist Episcopal Church — Rose Hill, Mahaska County, Iowa
→1976Roseman Covered Bridge — Winterset, Madison County, Iowa
→2010Roshek Brothers Department Store — Dubuque, Dubuque County, Iowa
→1983Roslyn Flats — Davenport, Scott County, Iowa
→1986Round Barn, Bruce Township Section 3 — Eagle Center, Benton County, Iowa
→2019Round Barn, Bruce Township Section 6 — La Porte, Benton County, Iowa
→1986Round Barn, Buckingham Township — Buckingham, Tama County, Iowa
→1986Round Barn, Cooper Township — Mapleton, Monona County, Iowa
→1986Round Barn, Dubuque Township — Dubuque, Dubuque County, Iowa
→1986Round Barn, Millville Township — Millville, Clayton County, Iowa
→1987Round Barn, Norway Township — Scarville, Winnebago County, Iowa
→1986Round Barn, Pilot Grove Township — Sennett, Montgomery County, Iowa
→1986Round Barn, Washington Township — Janesville, Black Hawk County, Iowa
→1986Round Barn, Washington Township — Sciola, Montgomery County, Iowa
→1984Rowhouses at 702-712 Kirkwood Boulevard — Davenport, Scott County, Iowa
→1986Rownd, C. A., Round Barn — Cedar Falls, Black Hawk County, Iowa
→1979Rule, Duncan, House — Mason City, Cerro Gordo County, Iowa
→1989Rumely--Des Moines Drug Company Building — Des Moines, Polk County, Iowa
→1973Russell, Rensselaer, House — Waterloo, Black Hawk County, Iowa
→1980Rye, Chris, House — Mason City, Cerro Gordo County, Iowa
→2016Sac City Chicago and North Western Depot — Sac City, Sac County, Iowa
→1981Sac County Courthouse — Sac City, Sac County, Iowa
→2022Sacred Heart Catholic Church — Fort Dodge, Webster County, Iowa
→2010Sacred Heart Hospital — LeMars, Plymouth County, Iowa
→1984Sacred Heart Roman Catholic Cathedral Complex — Davenport, Scott County, Iowa
→2018Sacred Heart School — Dubuque, Dubuque County, Iowa
→1983Saengerfest Halle — Davenport, Scott County, Iowa
→2020Saint Ansgar Public School — St. Ansgar, Mitchell County, Iowa
→1986Saint Barnabas Episcopal Church — Montrose, Lee County, Iowa
→1991Saint Boniface Catholic Church District — Westphalia, Shelby County, Iowa
→2012Saint Boniface Church — Clinton, Clinton County, Iowa
→2010Saint Irenaeus Church — Clinton, Clinton County, Iowa
→1987Saint John's Roman Catholic Church — Des Moines, Polk County, Iowa
→2011Saint Patrick's Catholic Church and Rectory — Perry, Dallas County, Iowa
→1992Saint Patrick's Roman Catholic Church — Albia, Monroe County, Iowa
→2019SAINTE GENEVIEVE (dredge) — Davenport, Scott County, Iowa
→1994Saints Peter and Paul Catholic Church — Pocahontas, Pocahontas County, Iowa
→1997Saints Peter and Paul Catholic Church — Solon, Johnson County, Iowa
→1995Saints Peter and Paul Church — Petersburg, Delaware County, Iowa
→2021Saints Peter and Paul Roman Catholic Church — Harper, Keokuk County, Iowa
→1977Salisbury House — Des Moines, Polk County, Iowa
→1995Sample, Hugh W. and Sarah, House — Keokuk, Lee County, Iowa
→1991Sanborn, C. M., Building — Maquoketa, Jackson County, Iowa
→2003Sanford, Arthur and Stella, House — Sioux City, Woodbury County, Iowa
→1995Sankot Motor Company — Belle Plaine, Benton County, Iowa
→1998Sargent's Garage — Des Moines, Polk County, Iowa
→1983Sauser-Lane House — Cascade, Dubuque County, Iowa
→1999Savanna--Sabula Bridge — Sabula, Jackson County, Iowa
→1998Savery Hotel — Des Moines, Polk County, Iowa
→2021Schantz, Christian K. and Margaret (Rich), House and Carpentry Shop — Wayland, Henry County, Iowa
→2014Schauder Hotel — Davenport, Scott County, Iowa
→1983Schebler, Richard, House — Davenport, Scott County, Iowa
→1998Scheibe, Julius, Cottage — Des Moines, Polk County, Iowa
→2014Schick's Express and Transfer Co. — Davenport, Scott County, Iowa
→1994Schindhelm--Drews House — Iowa City, Johnson County, Iowa
→1982Schlapp, George E., House — Fort Madison, Lee County, Iowa
→1983Schmidt Block — Davenport, Scott County, Iowa
→1977Schmidt House — Elkader, Clayton County, Iowa
→1983Schmidt, F. Jacob, House — Davenport, Scott County, Iowa
→2007Schmidt, Louis C. and Amelia L., House — Davenport, Scott County, Iowa
→2010Schmitt and Henry Manufacturing Company — Des Moines, Polk County, Iowa
→1987Schnellbacher, John and Fredericka Meyer, House — Winterset, Madison County, Iowa
→1984Schoenenberger, Nicholas, House and Barn — Winterset, Madison County, Iowa
→1982Scholte, Dominie Henry P., House — Pella, Marion County, Iowa
→2011School Number 6 — Davenport, Scott County, Iowa
→1999Schramm Building — Burlington, Des Moines County, Iowa
→1983Schricker, John C., House — Davenport, Scott County, Iowa
→1985Schricker, John, House — Davenport, Scott County, Iowa
→1983Schroeder Bros, Meat Market — Davenport, Scott County, Iowa
→2011Schroeder--Klein Grocery Company Warehouse — Dubuque, Dubuque County, Iowa
→2009Schrup, John and Marie (Palen) Farmstead Historic District — Dubuque, Dubuque County, Iowa
→1997Schulein, Ben and Harriet, House — Sioux City, Woodbury County, Iowa
→1996Schultz Brothers Drug Store — Williams, Hamilton County, Iowa
→1991Science Hall — Indianola, Warren County, Iowa
→1983Sciola Missionary Baptist Church — Sciola, Montgomery County, Iowa
→2014Scotch Grove Historic District — Monticello, Jones County, Iowa
→1983Scott County Jail — Davenport, Scott County, Iowa
→1988Scott, Mary A. and Caleb D., House — Des Moines, Polk County, Iowa
→1983Scottish Rite Consistory Building — Des Moines, Polk County, Iowa
→2019Seaman, Roy C. and Lena (Johnson), House — Cherokee, Cherokee County, Iowa
→2000Second and Third Avenue Historic District — Cedar Rapids, Linn County, Iowa
→1999Second Baptist Church — Centerville, Appanoose County, Iowa
→2014Second Baptist Church — Mount Pleasant, Henry County, Iowa
→1974Secrest Octagon Barn — Downey, Johnson County, Iowa
→1977Security Building — Cedar Rapids, Linn County, Iowa
→2006Security Building — Dubuque, Dubuque County, Iowa
→1983Seeberger-Loring-Kilburn House — Oskaloosa, Mahaska County, Iowa
→2009Seerley, William and Mary (Messersmith) Barn and Milkhouse--Smokehouse — Earlham, Madison County, Iowa
→1976Seminole Valley Farmstead — Cedar Rapids, Linn County, Iowa
→1980Seney, Charles, House — Mason City, Cerro Gordo County, Iowa
→1993Sentinel Block — Iowa Falls, Hardin County, Iowa
→1989SERGEANT FLOYD ★ NHL — Sioux City, Woodbury County, Iowa
→1966Sergeant Floyd Monument ★ NHL — Sioux City, Woodbury County, Iowa
→2005Seth Richards Commercial Block — Des Moines, Polk County, Iowa
→1996Seven Oaks — Sac City, Sac County, Iowa
→1977Severson, Nels, Barn — Carpenter, Mitchell County, Iowa
→2013Sexton Hotel — Stuart, Guthrie County, Iowa
→2020Shantz, Martin L. and Mary Jane (Yount), House — Mount Vernon, Linn County, Iowa
→1991Sharon Cemetery Historic District — Farmington, Lee County, Iowa
→2003Sharon Methodist Episcopal Church — Lost Nation, Clinton County, Iowa
→1983Sharon, Fred B., House — Davenport, Scott County, Iowa
→1992Shaw, Col. William T. and Elizabeth C., House — Anamosa, Jones County, Iowa
→1984Shaw, E. A., House — Davenport, Scott County, Iowa
→1986Shay, Lee, Farmhouse — Maloy, Ringgold County, Iowa
→1995Shea, John J. and Agnes, House — Council Bluffs, Pottawattamie County, Iowa
→1993Sheaffer, Craig and Virginia, House — Fort Madison, Lee County, Iowa
→2006Sheaffer, Walter A., House — Fort Madison, Lee County, Iowa
→2014Shelby Consolidated School — Shelby, Shelby County, Iowa
→1978Shelby County Courthouse — Harlan, Shelby County, Iowa
→1984Sheldahl First Norwegian Evangelical Lutheran Church — Sheldahl, Story County, Iowa
→1999Shell Rock Bridge — Shell Rock, Butler County, Iowa
→1997Shellito, Dr. Judd C. and Margaret S. Clarke, House — Independence, Buchanan County, Iowa
→1998Shellsburg Bridge — Shellsburg, Benton County, Iowa
→2017Sherman Hill Historic District — Des Moines, Polk County, Iowa
→2012Sherman Hill Historic District (Boundary Increase and Decrease) — Des Moines, Polk County, Iowa
→1977Sherman, Hoyt, Place — Des Moines, Polk County, Iowa
→1988Sherman, Lampson P., House — Des Moines, Polk County, Iowa
→2002Sherrill Mount House — Sherrill, Dubuque County, Iowa
→1983Shields Woolen Mill — Davenport, Scott County, Iowa
→1991Shimek, Bohumil, House — Iowa City, Johnson County, Iowa
→1980Shipley, C. P., House — Mason City, Cerro Gordo County, Iowa
→1984Shoemake, John H., House — Oskaloosa, Mahaska County, Iowa
→1993Shriver, William R. and Martha Foster, House — Winterset, Madison County, Iowa
→2012Siebels' Department Store--Boyer Valley Bank — Woodbine, Harrison County, Iowa
→1992Sieben, Mrs. Margaret, House — Baldwin, Jackson County, Iowa
→1977Siemer House — Davenport, Scott County, Iowa
→2013Sigma Pi Fraternity House — Iowa City, Johnson County, Iowa
→2008Sigma Sigma-Delta Chi Fraternity House — Ames, Story County, Iowa
→1983Sigourney Public Library — Sigourney, Keokuk County, Iowa
→2008Simmons Hardware Company Warehouse — Sioux City, Woodbury County, Iowa
→1988Simmons, John P., House — Des Moines, Polk County, Iowa
→1983Simpson, Charles S., House — Davenport, Scott County, Iowa
→2016Sinclair Building-Smulekoffs Furniture Store — Cedar Rapids, Linn County, Iowa
→2021Sinclair, T. M., Mansion — Cedar Rapids, Linn County, Iowa
→1998Singmaster, C.F. and Mary, House — Keota, Keokuk County, Iowa
→1974Sinnett Octagon House — Muscatine, Muscatine County, Iowa
→1979Sioux City Baptist Church — Sioux City, Woodbury County, Iowa
→1974Sioux City Central High School — Sioux City, Woodbury County, Iowa
→2016Sioux City Central High School and Central Annex (Boundary Increase) — Sioux City, Woodbury County, Iowa
→2008Sioux City Fire Station Number 3 — Sioux City, Woodbury County, Iowa
→1997Sioux City Free Public Library — Sioux City, Woodbury County, Iowa
→2008Sioux City Linseed Oil Works — Sioux City, Woodbury County, Iowa
→2004Sioux City Masonic Temple — Sioux City, Woodbury County, Iowa
→1983Sioux City Public Library (Smith Villa Branch) — Sioux City, Woodbury County, Iowa
→2000Sioux City Public Library--North Side Branch — Sioux City, Woodbury County, Iowa
→1977Sioux County Courthouse — Orange City, Sioux County, Iowa
→2012Sioux Theatre — Sioux Rapids, Buena Vista County, Iowa
→1983Sitz, Rudolph H., Building — Davenport, Scott County, Iowa
→1996Sixth and Forest Historic District — Des Moines, Polk County, Iowa
→1998Skunk River Bridge — Ames, Story County, Iowa
→1999Slayton Farms--Round Barn — Iowa Falls, Hardin County, Iowa
→1992Slye, Thomas, House — Andrew, Jackson County, Iowa
→2020Smith and Weller Building — New London, Henry County, Iowa
→1990Smith Farmhouse — Lake City, Calhoun County, Iowa
→1977Smith-Johnson House — Oskaloosa, Mahaska County, Iowa
→1983Smith, Alvord I., House — Davenport, Scott County, Iowa
→1990Smith, Gen. Cass and Belle, House — Lake City, Calhoun County, Iowa
→1983Smith, Henry H./J.H. Murphy House — Davenport, Scott County, Iowa
→1987Smith, Hiram C., House — Winterset, Madison County, Iowa
→1987Smith, Hiram C., Milking Shed — Winterset, Madison County, Iowa
→2020Smith, James J. and Anna J. (Linean), House #1 — Mount Vernon, Linn County, Iowa
→2020Smith, James J. and Anna J. (Linean), House #2 — Mount Vernon, Linn County, Iowa
→1984Smith, James, House — Davenport, Scott County, Iowa
→1979Smith, John, House — Le Claire, Scott County, Iowa
→1990Smith, Peter and Mary, House — Lake City, Calhoun County, Iowa
→1984Smith, William G., House — Davenport, Scott County, Iowa
→2002Smouse, David W., Opportunity School — Des Moines, Polk County, Iowa
→1983Smouse, Winfield, House — Washington, Washington County, Iowa
→1974Snake Alley — Burlington, Des Moines County, Iowa
→1975Snake Alley Historic District — Burlington, Des Moines County, Iowa
→1998Snider Bridge — Corning, Adams County, Iowa
→1977Snowden House — Waterloo, Black Hawk County, Iowa
→2013Sokol Gymnasium — Cedar Rapids, Linn County, Iowa
→1973South Summit Street District — Iowa City, Johnson County, Iowa
→2019South Ward School — Cresco, Howard County, Iowa
→1976Southeast Water Trough — Des Moines, Polk County, Iowa
→1998Southwest Fifth St. Bridge — Des Moines, Polk County, Iowa
→1978Spaulding Manufacturing Company — Grinnell, Poweshiek County, Iowa
→2010Spencer High School and Auditorium — Spencer, Clay County, Iowa
→1980Spencer, Charles H., House — Grinnell, Poweshiek County, Iowa
→1982Spencer, Roswell, House — Pleasant Valley, Scott County, Iowa
→1973Spirit Lake Massacre Log Cabin — Arnolds Park, Dickinson County, Iowa
→1980Spirit Lake Public Library — Spirit Lake, Dickinson County, Iowa
→1986Spotts Round Barn — Charles City, Floyd County, Iowa
→1987Sprague, Brown, and Knowlton Store — Winterset, Madison County, Iowa
→1996Spring Creek Friends Cemetery — Oskaloosa, Mahaska County, Iowa
→1996Spring Creek Meeting House--H Street Mission — Oskaloosa, Mahaska County, Iowa
→1990Spring Side — Bellevue, Jackson County, Iowa
→1990Springbrook State Park, Civilian Conservation Corps Area — Guthrie Center, Guthrie County, Iowa
→1996Spurgin Residence — Oskaloosa, Mahaska County, Iowa
→2022Squaw Creek Bridge — Ridgeport, Boone County, Iowa
→1998Squaw Creek Bridge 2 — Ridgeport, Boone County, Iowa
→1995Squiers, J. E., House — Maquoketa, Jackson County, Iowa
→1991Squirrel Hollow County Park Historic District — Jefferson, Greene County, Iowa
→1980St Mary of the Assumption Church — Fort Madison, Lee County, Iowa
→1979St. Ambrose Cathedral and Rectory — Des Moines, Polk County, Iowa
→2021St. Anthony’s Church — Des Moines, Polk County, Iowa
→1984St. Anthony's Roman Catholic Church Complex — Davenport, Scott County, Iowa
→1998St. Boniface Historic District — Sioux City, Woodbury County, Iowa
→1999St. Boniface of New Vienna Historic District — New Vienna, Dubuque County, Iowa
→1976St. George's Episcopal Church — Le Mars, Plymouth County, Iowa
→1991St. James Episcopal Church — Oskaloosa, Mahaska County, Iowa
→2015St. James United Methodist Church — Cedar Rapids, Linn County, Iowa
→2002St. John Baptist Church — Mason City, Cerro Gordo County, Iowa
→1989St. John's Episcopal Church and Parish Hall — Keokuk, Lee County, Iowa
→1977St. John's Lutheran Church — Kalona, Johnson County, Iowa
→1983St. John's Methodist Episcopal Church — Davenport, Scott County, Iowa
→1976St. Joseph Church and Parish Hall — Elkader, Clayton County, Iowa
→1983St. Joseph's Catholic Church — Davenport, Scott County, Iowa
→2005St. Joseph's Roman Catholic Church — Stone City, Jones County, Iowa
→1995St. Joseph's Roman Catholic Church and Cemetery Historic District — Lacona, Marion County, Iowa
→1984St. Katherine's Historic District — Davenport, Scott County, Iowa
→1992St. Lawrence Catholic Church — Otter Creek, Jackson County, Iowa
→1983St. Luke's Hospital — Davenport, Scott County, Iowa
→2002St. Luke's Methodist Church — Monticello, Jones County, Iowa
→1998St. Luke's Methodist Episcopal Church — Dubuque, Dubuque County, Iowa
→2005St. Luke's School and Recreation Center — St. Lucas, Fayette County, Iowa
→1984St. Mary's Academy — Davenport, Scott County, Iowa
→2004St. Mary's Catholic Church Historic District — Guttenberg, Clayton County, Iowa
→1980St. Mary's Church and Rectory — Iowa City, Johnson County, Iowa
→1979St. Mary's Parish Church Buildings — Riverside, Washington County, Iowa
→1995St. Mary's Rectory — Iowa City, Johnson County, Iowa
→2022St. Mary’s Roman Catholic Church — Nichols, Muscatine County, Iowa
→1984St. Mary's Roman Catholic Church Complex — Davenport, Scott County, Iowa
→1993St. Matthew's by the Bridge Episcopal Church — Iowa Falls, Hardin County, Iowa
→1983St. Michael's Church, Cemetery, Rectory and Ancient Order of Hibernians Hall — Parnell, Iowa County, Iowa
→1994St. Olaf Auditorium — St. Olaf, Clayton County, Iowa
→1983St. Patrick Church — Imogene, Fremont County, Iowa
→1992St. Patrick's Catholic Church, Cedar — Churdan, Greene County, Iowa
→1978St. Patrick's Church — Cumming, Madison County, Iowa
→1992St. Patrick's Church--Garryowen — Garryowen, Jackson County, Iowa
→1985St. Paul Methodist Episcopal Church — Cedar Rapids, Linn County, Iowa
→1983St. Paul's English Lutheran Church — Davenport, Scott County, Iowa
→1978St. Paul's Episcopal Church — Harlan, Shelby County, Iowa
→2010St. Paul's Episcopal Church — Des Moines, Polk County, Iowa
→1985St. Paul's Episcopal Church and Parish Hall — Durant, Cedar County, Iowa
→1983St. Peter Church — Keokuk, Lee County, Iowa
→1992St. Peter's Church and Rectory — Council Bluffs, Pottawattamie County, Iowa
→1976St. Peters United Evangelical Lutheran Church — Ceres, Clayton County, Iowa
→1977St. Stephen's Episcopal Church — Newton, Jasper County, Iowa
→1984St. Thomas Episcopal Church — Sioux City, Woodbury County, Iowa
→2004Standard Glass and Paint Company Building — Des Moines, Polk County, Iowa
→1975Star-Clipper-Canfield Building and Winding Stairway — Traer, Tama County, Iowa
→1983Starker-Leopold Historic District — Burlington, Des Moines County, Iowa
→1983State Bank of Stratford — Stratford, Hamilton County, Iowa
→2002State Center Commercial Historic District — State Center, Marshall County, Iowa
→1992State Quarry, Iowa Men's Reformatory — Anamosa, Jones County, Iowa
→1998State Quarry, Old — North Liberty, Johnson County, Iowa
→1984State Savings Bank — Council Bluffs, Pottawattamie County, Iowa
→1985State Savings Bank — Logan, Harrison County, Iowa
→1999State Savings Bank — Quasqueton, Buchanan County, Iowa
→1998State Street Bridge — Mason City, Cerro Gordo County, Iowa
→2003Stauer, Peter, House — McGregor, Clayton County, Iowa
→2004Steamboat Rock Consolidated Schools Building — Steamboat Rock, Hardin County, Iowa
→1978Stearns, C. S., House — Garden Grove, Decatur County, Iowa
→1976Stemmer, J. C., House — Elkader, Clayton County, Iowa
→1987Stephens, A. J., House — Chariton, Lucas County, Iowa
→1985Stevenson, Samuel A. and Margaret, House — Des Moines, Polk County, Iowa
→1998Stewart Avenue Bridge — Mason City, Cerro Gordo County, Iowa
→1976Stewart Library — Grinnell, Poweshiek County, Iowa
→1987Stewart, Frank, House — Washington, Washington County, Iowa
→1983Stewart, J. W., House — Davenport, Scott County, Iowa
→1983Steyer Bridge — Decorah, Winneshiek County, Iowa
→1980Steyer Opera House — Decorah, Winneshiek County, Iowa
→1984Stock Judging Pavilion — Oskaloosa, Mahaska County, Iowa
→1992Stockman, Dr. G. C., House — Mason City, Cerro Gordo County, Iowa
→1998Stoe Creek Bridge — Oelwein, Fayette County, Iowa
→1996Stokes, Dr. Ella, House — Oskaloosa, Mahaska County, Iowa
→1997Stoll Building Works — Boone, Boone County, Iowa
→2001Stone Academy — Solon, Johnson County, Iowa
→1984Stone Barn — Guttenberg, Clayton County, Iowa
→2008Stone City Historic District — Anamosa, Jones County, Iowa
→1983Stone House — Le Claire, Scott County, Iowa
→1977Stone School — Le Claire, Scott County, Iowa
→1992Stoner, Thomas I., House — Des Moines, Polk County, Iowa
→1998Storm Creek Bridge — Carroll, Carroll County, Iowa
→1998Storm Creek Bridge 2 — Carroll, Carroll County, Iowa
→2017Storm Lake High School — Storm Lake, Buena Vista County, Iowa
→1983Storm Lake Public Library — Storm Lake, Buena Vista County, Iowa
→1996Stranahan, Prof. Edgar H. and Irene D., House — Oskaloosa, Mahaska County, Iowa
→1975Stratton House — Centerville, Appanoose County, Iowa
→1974Stringtown House — Centerville, Davis County, Iowa
→1984Struck, Dr. Kuno, House — Davenport, Scott County, Iowa
→1988Stuart, Dr. Richard and Paulina, House — Des Moines, Polk County, Iowa
→1999Stubbins, George E., House — Britt, Hancock County, Iowa
→1979Stuckslager, Harrison, House — Lisbon, Linn County, Iowa
→2015Studebaker Corporation Branch Office Building — Des Moines, Polk County, Iowa
→1984Sturdivant-Sawyer House — Centerville, Appanoose County, Iowa
→1977Suckow, Ruth, House — Earlville, Delaware County, Iowa
→1979Suiter, Jacob, House — Le Claire, Scott County, Iowa
→1979Suiter, John H., House — Le Claire, Scott County, Iowa
→1979Suiter, William, House — Le Claire, Scott County, Iowa
→1983Summit Apartment Building — Iowa City, Johnson County, Iowa
→1998Sumner Bridge — Sumner, Fayette County, Iowa
→2004Sumner High School — Sumner, Bremer County, Iowa
→2013Sumner School — Mount Vernon, Linn County, Iowa
→1988Sunday, Robert H., House — Marshalltown, Marshall County, Iowa
→2011Surf Ballroom — Clear Lake, Cerro Gordo County, Iowa
→1998Sutliff Bridge — Iowa City, Johnson County, Iowa
→1983Swan, George B., House — Davenport, Scott County, Iowa
→1999Swedesburg Historic Commercial District — Swedesburg, Henry County, Iowa
→1983Swedish Baptist Church — Davenport, Scott County, Iowa
→2006Swedish Evangelical Lutheran Augustana Church — Sioux City, Woodbury County, Iowa
→1999Swedish Evangelical Lutheran Church — Swedesburg, Henry County, Iowa
→1991Swigert, W. B., House — Maquoketa, Jackson County, Iowa
→1995Sylvan Theater Historic District — Des Moines, Polk County, Iowa
→2001Syndicate Block — Des Moines, Polk County, Iowa
→2005Syndicate Block — La Porte City, Black Hawk County, Iowa
→2007Tabor Antislavery Historic District — Tabor, Fremont County, Iowa
→2011Tabor Congregational Church — Tabor, Fremont County, Iowa
→2006Taft--West Warehouse — Des Moines, Polk County, Iowa
→2002Taft, Stephen Harris, House — Humboldt, Humboldt County, Iowa
→1981Tama County Courthouse — Toledo, Tama County, Iowa
→1981Tama County Jail — Toledo, Tama County, Iowa
→2019Tate Arms — Iowa City, Johnson County, Iowa
→1991Taubman, Henry, House — Maquoketa, Jackson County, Iowa
→1981Taylor County Courthouse — Bedford, Taylor County, Iowa
→1983Taylor School — Davenport, Scott County, Iowa
→1985Taylor-Van Note — Cedar Rapids, Linn County, Iowa
→1979Taylor, Wenzil, Building — Spillville, Winneshiek County, Iowa
→1998Taylor's Ford Bridge — Independence, Buchanan County, Iowa
→1999Teachout Building — Des Moines, Polk County, Iowa
→1979Tedford, W. H., House — Corydon, Wayne County, Iowa
→1996Temple, Marcellus Luther and Julia Protzman, House — Osceola, Clarke County, Iowa
→1983Templeton, I. Edward, House — Davenport, Scott County, Iowa
→2008Ten Hagen Cottage-Stegman Store — Pella, Marion County, Iowa
→2017Ten Mile Creek Bridge — Decorah, Winneshiek County, Iowa
→2003Terrace Hill ★ NHL — Des Moines, Polk County, Iowa
→1972Terrace Hill — Des Moines, Polk County, Iowa
→2006Terrace Park Historic District — Marion, Linn County, Iowa
→1983Tevoet, Lambert, House — Davenport, Scott County, Iowa
→1996The Capitol Theater — Burlington, Des Moines County, Iowa
→2002The Park Place--Grand Avenue Residential District — Keokuk, Lee County, Iowa
→1976Thedinga, J. H., House — Dubuque, Dubuque County, Iowa
→2002Theodore Roosevelt High School — Des Moines, Polk County, Iowa
→2018Third Street Bridge (FHWA No. 012250) — Waverly, Bremer County, Iowa
→1978Thompson, Charles J., House — Forest City, Winnebago County, Iowa
→1986Thomsen Round Barn — Armstrong, Emmet County, Iowa
→1993Tidrick, Miller Richard and Mary Fisher, House — Winterset, Madison County, Iowa
→1991Timmerman--Burd Building — Mount Pleasant, Henry County, Iowa
→2000Tipton State Bank — Tipton, Cedar County, Iowa
→1975Todd House — Tabor, Fremont County, Iowa
→1986Tonsfeldt Round Barn — Le Mars, Plymouth County, Iowa
→1983Torrance House — Lisbon, Linn County, Iowa
→2002Town Clock Building — Dubuque, Dubuque County, Iowa
→1990Trappers Bay State Park Picnic Shelter — Lake Park, Dickinson County, Iowa
→1998Tremaine Bridge — Webster City, Hamilton County, Iowa
→1996Trent--Beaver House — Des Moines, Polk County, Iowa
→1988Trier, Paul J. and Ida, House — Johnston, Polk County, Iowa
→2003Trimble--Parker Historic Farmstead District — Bloomfield, Davis County, Iowa
→1974Trinity Episcopal Cathedral — Davenport, Scott County, Iowa
→1974Trinity Episcopal Church — Muscatine, Muscatine County, Iowa
→1974Trinity Episcopal Church — Iowa City, Johnson County, Iowa
→1990Trinity Memorial Episcopal Church — Mapleton, Monona County, Iowa
→1998Trinity Methodist Episcopal Church — Des Moines, Polk County, Iowa
→1979Tromley, George, Jr., House — Le Claire, Scott County, Iowa
→1979Tromley, George, Sr., House — Le Claire, Scott County, Iowa
→1976Troy Academy — Troy, Davis County, Iowa
→1979Tulleys, Lysander, House — Council Bluffs, Pottawattamie County, Iowa
→2014Turkey River Bridge — Festina, Winneshiek County, Iowa
→2000Turner Hall — Postville, Allamakee County, Iowa
→1997Turner, Francis A. and Rose M., House — Avoca, Pottawattamie County, Iowa
→1985Turner, Fred G., House — North English, Iowa County, Iowa
→1998Turner, Susie P., Double House — Des Moines, Polk County, Iowa
→2015Tuttle, Thomas F. and Nancy, House — Pella, Marion County, Iowa
→1998Twin Bridge — Fayette, Fayette County, Iowa
→1993Twombley, Voltaire, Building — Keosauqua, Van Buren County, Iowa
→2009Tyden Farm No. 6 Farmstead Historic District — Dougherty, Floyd County, Iowa
→1978U. S. Post Office — Creston, Union County, Iowa
→1978U.S. Post Office — Centerville, Appanoose County, Iowa
→1976U.S. Post Office — Ottumwa, Wapello County, Iowa
→1974U.S. Post Office — Des Noines, Polk County, Iowa
→1974U.S. Post Office and Courthouse — Keokuk, Lee County, Iowa
→2008Ulysses Simpson Grant Elementary School — Oskaloosa, Mahaska County, Iowa
→2015Union Bakery — Iowa City, Johnson County, Iowa
→1991Union Block — Mount Pleasant, Henry County, Iowa
→1986Union Brewery — Iowa City, Johnson County, Iowa
→2002Union Cemetery Gardener's Cottage — Iowa Falls, Hardin County, Iowa
→1976Union Church — Davis City, Decatur County, Iowa
→1983Union Electric Telephone & Telegraph — Davenport, Scott County, Iowa
→1977Union Presbyterian Church — Stacyville, Mitchell County, Iowa
→1983Union Savings Bank and Trust — Davenport, Scott County, Iowa
→1983Union Station and Burlington Freight House — Davenport, Scott County, Iowa
→1974Union Sunday School — Clermont, Fayette County, Iowa
→1976United Presbyterian Church, Summerset — Scotch Ridge, Warren County, Iowa
→2005United States Post Office and Court House — Davenport, Scott County, Iowa
→2013United States Post Office and Courthouse — Sioux City, Woodbury County, Iowa
→2005Universalist Church — Mitchellville, Polk County, Iowa
→1984Untiedt, Claus, House — Davenport, Scott County, Iowa
→1998Upper Bluffton Bridge — Bluffton, Winneshiek County, Iowa
→2012Upper Central Avenue Commercial Historic District — Dubuque, Dubuque County, Iowa
→1998Upper Iowa River Bridge — Dorchester, Allamakee County, Iowa
→2005Upper Main Street Historic District — Dubuque, Dubuque County, Iowa
→2011Upper Main Street Historic District (Boundary Increase) — Dubuque, Dubuque County, Iowa
→1991Upper Paradise — Bellevue, Jackson County, Iowa
→1998Upper Paris Bridge — Coggin, Linn County, Iowa
→1966Upper South Hotel ★ NHL — Middle Amana, Iowa County, Iowa
→1983Upper Stone Schoolhouse — Vinton, Benton County, Iowa
→1994US Post Office--Iowa Falls — Iowa Falls, Hardin County, Iowa
→1988Vail, Mrs. Marian D.--Prof. Charles Noyes Kinney House — Des Moines, Polk County, Iowa
→2022Val-Air Ballroom — West Des Moines, Polk County, Iowa
→2021Valley Auto Co.-Morgan Auto Co. Garage — West Des Moines, Polk County, Iowa
→1983Valley Junction-West Des Moines City Hall and Engine House — West Des Moines, Polk County, Iowa
→1976Valley Mills — Garnavillo, Clayton County, Iowa
→1976Van Allen Store ★ NHL — Clinton, Clinton County, Iowa
→1987Van Asch, William, House--Huibert Debooy Commercial Room — Pella, Marion County, Iowa
→1977Van Buren County Courthouse — Keosauqua, Van Buren County, Iowa
→2003Van Den Berg, Hendrik J. and Wilhelmina H., Cottage — Pella, Marion County, Iowa
→1977Van Loon, Dirk, House — Pella, Marion County, Iowa
→2008Van Maren, Henry and Johanna, House--Diamond Filling Station — Pella, Marion County, Iowa
→2016Van Patten House — Iowa City, Johnson County, Iowa
→1979Van Sant, Samuel, House — Le Claire, Scott County, Iowa
→1990Van Spanckeren, B. H. and J. H. H., Row Houses — Pella, Marion County, Iowa
→1985Vander Veer Park Historic District — Davenport, Scott County, Iowa
→2004Vander Wilt Farmstead Historic District — Leighton, Mahaska County, Iowa
→2001Vander Wilt, Dirk and Cornelia J., Cottage — Pella, Marion County, Iowa
→1987Vawter, J. G. and Elizabeth S., House — Winterset, Madison County, Iowa
→2000Veneman's Bungalow Court Historic District — Des Moines, Polk County, Iowa
→2018Vermeer, Gary J. and Matilda, Farmstead — Pella, Mahaska County, Iowa
→1978Vermilion Estate — Centerville, Appanoose County, Iowa
→2002Vernon School — Vernon, Van Buren County, Iowa
→1989Village of St. Donatus Historic District — St. Donatus, Jackson County, Iowa
→2015Villisca National Guard Armory — Villisca, Montgomery County, Iowa
→1973Vincent House — Fort Dodge, Webster County, Iowa
→1998Vine Street Bridge — West Union, Fayette County, Iowa
→1983Vinton Public Library — Vinton, Benton County, Iowa
→1995Vogel Place Historic District — Ottumwa, Wapello County, Iowa
→1978Vogt House — Iowa City, Johnson County, Iowa
→1984Von Ach, Frank J., House — Davenport, Scott County, Iowa
→1982Voorhees, John K., House — Oskaloosa, Mahaska County, Iowa
→1993W. R. C. Hall — Iowa Falls, Hardin County, Iowa
→1996Wabash Combination Depot--Moravia — Moravia, Appanoose County, Iowa
→1990Wabash Combination Depot--Shenandoah — Shenandoah, Page County, Iowa
→1998Wabash Railroad Bridge — Pella, Marion County, Iowa
→1978Wagner-Mozart Music Hall — Mason City, Cerro Gordo County, Iowa
→2008Wahkonsa Hotel — Fort Dodge, Webster County, Iowa
→1985Wallace, Henry C., House — Winterset, Madison County, Iowa
→1993Wallace, Henry, House — Des Moines, Polk County, Iowa
→2020Waln, Elijah D. and Mary J. (Adams), House — Mount Vernon, Linn County, Iowa
→2002Walnut Grove School — Osage, Mitchell County, Iowa
→2000Walnut Street Baptist Church — Waterloo, Black Hawk County, Iowa
→2017Walnut Tire and Battery Co.--Globe Publishing Company Building — Des Moines, Polk County, Iowa
→1984Walsh Flats/Langworth Building — Davenport, Scott County, Iowa
→1983Walter-Gimble House — Davenport, Scott County, Iowa
→1983Walter, Lowell E., House — Quasqueton, Buchanan County, Iowa
→1990Wanata State Park Picnic Shelter — Peterson, Clay County, Iowa
→1981Wapello County Courthouse — Ottumwa, Wapello County, Iowa
→1975Wapsipinicon Mill — Independence, Buchanan County, Iowa
→1998Wapsipinicon River Bridge — Independence, Buchanan County, Iowa
→1997Ward, George H. and Loretta, House — West Liberty, Muscatine County, Iowa
→1979Warde, J. C. B., House — Muscatine, Muscatine County, Iowa
→1985Warfield, Pratt and Howell Company Warehouse — Des Moines, Polk County, Iowa
→1983Warner Apartment Building — Davenport, Scott County, Iowa
→2023Warnock Building — Sioux City, Woodbury County, Iowa
→1988Warnock, Dr. Francis B., House — Battle Creek, Ida County, Iowa
→2019Warren County Court House — Indianola, Warren County, Iowa
→1979Warren Opera House Block and Hetherington Block — Greenfield, Adair County, Iowa
→1985Warrior Hotel — Sioux City, Woodbury County, Iowa
→1978Wartburg Teachers' Seminary — Waverly, Bremer County, Iowa
→1998Washington Avenue Bridge — Iowa Falls, Hardin County, Iowa
→2012Washington Avenue Commercial Historic District — Iowa Falls, Hardin County, Iowa
→1981Washington County Courthouse — Washington, Washington County, Iowa
→2013Washington Downtown Historic District — Washington, Washington County, Iowa
→1984Washington Flats — Davenport, Scott County, Iowa
→1984Washington Gardens — Davenport, Scott County, Iowa
→1998Washington Mill Bridge — Bernard, Dubuque County, Iowa
→1977Washington Park — Dubuque, Dubuque County, Iowa
→1980Washington Prairie Methodist Church — Decorah, Winneshiek County, Iowa
→2011Washington Street and East 22nd Street Historic District — Dubuque, Dubuque County, Iowa
→1979Washington Township Center High School — Amish, Johnson County, Iowa
→1999Wasson, Dr. Jesse, Building — La Porte City, Black Hawk County, Iowa
→1978Waterfield, William, House — Raymond, Black Hawk County, Iowa
→2011Waterloo East Commercial Historic District — Waterloo, Black Hawk County, Iowa
→2013Waterloo Masonic Temple — Waterloo, Black Hawk County, Iowa
→1983Waterloo Public Library (West Branch) — Waterloo, Black Hawk County, Iowa
→1988Waterloo Public Library--East Side Branch — Waterloo, Black Hawk County, Iowa
→2015Waterloo Ridge Menigheds Kirke og Kirkegard Historic District — Dorchester, Allamakee County, Iowa
→1998Watson's Grocery — State Center, Marshall County, Iowa
→1986Waveland Round Barn — Cushing, Ida County, Iowa
→1976Waverly House — Waverly, Bremer County, Iowa
→2013Waverly Municipal Hydroelectric Powerhouse — Waverly, Bremer County, Iowa
→1975Weaver, James B., House ★ NHL — Bloomfield, Davis County, Iowa
→1984Weber House — Guttenberg, Clayton County, Iowa
→2002Weber, Alois and Annie, House — Keokuk, Lee County, Iowa
→1982Webster City Post Office — Webster City, Hamilton County, Iowa
→1981Webster County Courthouse — Fort Dodge, Webster County, Iowa
→1977Webster, Dickinson, House — Osceola, Clarke County, Iowa
→1978Weess, Frank J., House — Keokuk, Lee County, Iowa
→1984Wehmer House — Guttenberg, Clayton County, Iowa
→2013Wehner, Roland and Marilyn, House — Iowa City, Johnson County, Iowa
→1997Weins Commercial Building — Independence, Buchanan County, Iowa
→1989Weis, Henry, House — Waterloo, Black Hawk County, Iowa
→1998Weitz, Charles H. and Lena May, House — Des Moines, Polk County, Iowa
→1979Welch Apartments — Muscatine, Muscatine County, Iowa
→1985Wells--Stubbs House — Fairfield, Jefferson County, Iowa
→1983Wells, George A., House — Fairfield, Jefferson County, Iowa
→1974Wentz, Jacob, House — Iowa City, Johnson County, Iowa
→1984Werthman Grocery — Davenport, Scott County, Iowa
→1998West Auburn Bridge — West Union, Fayette County, Iowa
→1987West Branch Commercial Historic District — West Branch, Cedar County, Iowa
→1995West Branch Commercial Historic District (Boundary Increase) — West Branch, Cedar County, Iowa
→1990West Branch Commercial Historic District (Boundary Increase) — West Branch, Cedar County, Iowa
→1984West Chester — Des Moines, Polk County, Iowa
→2004West Eleventh Street Historic District — Dubuque, Dubuque County, Iowa
→2004West Grove United Methodist Church — West Grove, Davis County, Iowa
→2008West Hill Historic District — Muscatine, Muscatine County, Iowa
→1991West Jefferson Street Historic District — Burlington, Des Moines County, Iowa
→2002West Liberty Commercial Historic District — West Liberty, Muscatine County, Iowa
→1998West Ninth Streetcar Line Historic District — Des Moines, Polk County, Iowa
→2019West Paint Creek Synod Evangelical Lutheran Church and Cemetery — Waterville, Allamakee County, Iowa
→1991West Pleasant Street Historic District — Maquoketa, Jackson County, Iowa
→1983West Third Street Historic District — Davenport, Scott County, Iowa
→1985West, Wesley, House — Mount Vernon, Linn County, Iowa
→1976Western Hotel — Holy Cross, Dubuque County, Iowa
→1984Westphal-Schmidt House — Davenport, Scott County, Iowa
→2009Wetherby, Isaac A., House — Iowa City, Johnson County, Iowa
→1986Wheeler, John R., Jr., House — Dunlap, Harrison County, Iowa
→1998Wherry Block — Des Moines, Polk County, Iowa
→1985Whitaker, Charles, House — Davenport, Scott County, Iowa
→2014White, Abiathar and Nancy, House — Burlington, Des Moines County, Iowa
→1994White, Arvine and Elizabeth W., House — Albia, Monroe County, Iowa
→1984White, H. A., General Store and House — North Liberty, Johnson County, Iowa
→1987White, Munger and Company, Store — Winterset, Madison County, Iowa
→1983White, Theodore, House — South English, Keokuk County, Iowa
→1994White, W. T. S., House and Carriage House — Clarinda, Page County, Iowa
→1979Whitehead, C. H., House — Marshalltown, Marshall County, Iowa
→1990Whiting, Newell A., House — Onawa, Monona County, Iowa
→1993Whittier Friends Meeting House — Whittier, Linn County, Iowa
→2004Whittier School — Waterloo, Black Hawk County, Iowa
→1986Wickfield Round Barn — Cantril, Van Buren County, Iowa
→1995Wickham--De Vol House — Council Bluffs, Pottawattamie County, Iowa
→1979Wickham, O. P., House — Council Bluffs, Pottawattamie County, Iowa
→1979Wieting Theater — Toledo, Tama County, Iowa
→2017Wild, Daniel and Margaret, House — Cedar Falls, Black Hawk County, Iowa
→2020Wilds, Col. John Q. and Rowena (Camp), House — Mount Vernon, Linn County, Iowa
→1998Wildwood Park Historic District — Charles City, Floyd County, Iowa
→1984Wilkinson, Thomas C., House — Davenport, Scott County, Iowa
→1976Willard, Leroy R., House — Marshalltown, Marshall County, Iowa
→1982WILLIAM M. BLACK (dredge) ★ NHL — Dubuque, Dubuque County, Iowa
→1976Williams, Seneca, Mill — Maquoketa, Jackson County, Iowa
→1998Williamson School — Williamson, Lucas County, Iowa
→2007Williges Building — Siouz City, Woodbury County, Iowa
→2005Willow--Bluff--3rd Street Historic District — Council Bluffs, Pottawattamie County, Iowa
→1991Wilson Building — Fairfield, Jefferson County, Iowa
→2014Wilson Buildings — Clinton, Clinton County, Iowa
→2004Wilson District #7 School — Delmar, Clinton County, Iowa
→1977Wilson, Anson, House — Maquoketa, Jackson County, Iowa
→1982Wilson, Asa, House — Bloomfield, Davis County, Iowa
→1979Wilson, John, House — DeSoto, Dallas County, Iowa
→2010Wilson, Paton and Hannah, House — Salem, Henry County, Iowa
→1987Wilson, Seth and Elizabeth, House — Earlham, Madison County, Iowa
→1991Wilson, US Senator James F., House — Fairfield, Jefferson County, Iowa
→1993Wilton Candy Kitchen — Wilton, Muscatine County, Iowa
→1977Windrem House — Iowa City, Johnson County, Iowa
→1981Winnebago County Courthouse — Forest City, Winnebago County, Iowa
→1998Winnebago River Bridge — Mason City, Cerro Gordo County, Iowa
→1976Winnishiek County Courthouse — Decorah, Winneshiek County, Iowa
→2020Winterset High School — Winterset, Madison County, Iowa
→2004Wishard, Henry, House — Bloomfield, Davis County, Iowa
→1998Witwer Grocery Company Building — Cedar Rapids, Linn County, Iowa
→2021WOC Broadcasting Center — Davenport, Scott County, Iowa
→1979Wolf, Charles, House — Parkersburg, Butler County, Iowa
→1980Wolf, Mier, House — Mason City, Cerro Gordo County, Iowa
→1982Wolff, Philip A., House and Carriage House — Cedar Rapids, Linn County, Iowa
→1984Wolters Filling Station — Davenport, Scott County, Iowa
→1984Women's Christian Temperance Union Public Fountain — Shenandoah, Page County, Iowa
→1986Wood, Herman, Round Barn — Iowa Falls, Franklin County, Iowa
→1982Wood, Jeremiah, House — Sabula, Jackson County, Iowa
→1995Wood, William Kennison, House — Iowa Center, Story County, Iowa
→2002Woodbine Normal and Grade School — Woodbine, Harrison County, Iowa
→1997Woodbine Public Library — Woodbine, Harrison County, Iowa
→2012Woodbine Savings Bank — Woodbine, Harrison County, Iowa
→1973Woodbury County Courthouse ★ NHL — Sioux City, Woodbury County, Iowa
→2000Woodland Place Historic District — De Moines, Polk County, Iowa
→2016Woodlawn Cemetery Gates and Shelter — Washington, Washington County, Iowa
→1979Woodlawn Historic District — Iowa City, Johnson County, Iowa
→1984Woods, Oscar C., House — Davenport, Scott County, Iowa
→1983Worley, Philip, House — Davenport, Scott County, Iowa
→1981Worth County Courthouse — Northwood, Worth County, Iowa
→1981Wright County Courthouse — Clarion, Wright County, Iowa
→1983Wupperman Block/I.O.O.F. Hall — Davenport, Scott County, Iowa
→1979Y.M.C.A. Building — Council Bluffs, Pottawattamie County, Iowa
→1980Yelland, Curtis, House — Mason City, Cerro Gordo County, Iowa
→2021Yellow River State Forest Fire Tower — Harpers Ferry, Allamakee County, Iowa
→1998Yellow Smoke Park Bridge — Denison, Crawford County, Iowa
→1983YMCA Building — Waterloo, Black Hawk County, Iowa
→1973Young, Alexander, Cabin — Washington, Washington County, Iowa
→2014Young, Col. Joseph, Block — Davenport, Scott County, Iowa
→1986Young, John W., Round Barn — Traer, Tama County, Iowa
→1980Youngblood, Tessa, House — Mason City, Cerro Gordo County, Iowa
→2009Youngerman Block — Des Moines, Polk County, Iowa
→2007Youngville Cafe — Watkins, Benton County, Iowa
→2010Younker Brothers Department Store — Des Moines, Polk County, Iowa
→2012Zalesky, Frank E. and Katie (Cherveny), House — Belle Plaine, Benton County, Iowa
→2002Ziepprecht Block — Dubuque, Dubuque County, Iowa
→1996Zitterell, William J. and Hattie J., House — Webster City, Hamilton County, Iowa
→1983Zoeller Bros-Independent Malting Co. — Davenport, Scott County, Iowa
→1991Zuhn Building — Mount Pleasant, Henry County, Iowa
→1975Zwemer Hall, Northwestern College — Orange, Sioux County, Iowa
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