Iowa - Constructed - 1890–1899
| Adair County Courthouse |
| Agriculture Hall |
| Bank of Sumner |
| Barkley, Alonzo J. and Flora, House |
| Beach School |
| Beck, James A., House |
| Berkhimer Bridge |
| Bethany Danish Evangelical Lutheran Church |
| Boerner-Fry Company/Davis Hotel |
| Buresh Farm |
| Calvary Baptist Church/First Baptist Church |
| Chicago & Northwestern Passenger Depot and Baggage Room-Carroll |
| Cornell, W. J. and Nettie J., House |
| Denny, Professor Charles O., House |
| Dubuque County Courthouse |
| Floral Hall |
| Franklin County Courthouse |
| Gillette, Guy M. and Rose (Freeman), House |
| Grand View College (Old Main) |
| Hamilton Brothers Building |
| Hammond Bridge |
| Hardin County Courthouse |
| Hays, E. R., House |
| Homestead Building |
| Interstate Power Company Building |
| I.O.O.F. (International Order of Odd Fellows) Valley Junction Lodge Hall No. 604 |
| Johnson, Mrs. Lydia, House |
| Knotts, Nellie and Thomas, House |
| Lake, John, House |
| Le Grand Bridge |
| Louden, William and Mary Jane, House |
| Marsh, E.A. and Rebecca (Johnson), House |
| McCormick Harvesting Machine Company Building |
| Morningside College Historic District |
| Netcott-Pfeiffer House |
| Odenweller, F. F.-James P. and Nettie Morey House |
| Osborne, Edmund B., House |
| Peirce, John, House |
| President's Cottage |
| Ray, Frank G., House & Carriage House |
| Reynolds, Anson O., House |
| Riekenberg, J. H., House |
| Ringgold County Jail |
| Sacred Heart Roman Catholic Cathedral Complex |
| Saints Peter and Paul Roman Catholic Church Historic District |
| Seth Richards Commercial Block |
| Seven Oaks |
| Shimek, Bohumil, House |
| Simmons, John P., House |
| Spurgin Residence |
| Stewart, Frank, House |
| Stuart, Dr. Richard and Paulina, House |
| Swedish Evangelical Lutheran Augustana Church |
| Temple, Marcellus Luther and Julia Protzman, House |
| Wapello County Courthouse |
| Ward, George H. and Loretta, House |
| Warren Opera House Block and Hetherington Block |
| Weins Commercial Building |
| West Paint Creek Synod Evangelical Lutheran Church and Cemetery |
| Wheeler, John R., Jr., House |
| Wild, Daniel and Margaret, House |
| Wolf, Charles, House |
| Worth County Courthouse |
| Wright County Courthouse |
| Zoeller Bros-Independent Malting Co. |
Data from United States Park Service and Wikidata
