Adams County
Former listing
Butler County
| Cherry Street Bridge | |
| Coldwater Church of the Brethren | |
| Netcott-Pfeiffer House | |
| Renke and Wubke Renken House | |
| Shell Rock Bridge | |
| Charles Wolf House |
Chickasaw County
Former listing
Clarke County
Former listing
Decatur County
| Decatur County Courthouse | |
| Grand River Bridge | |
| Liberty Hall | |
| J.J. McClung House | |
| Missouri, Iowa & Nebraska Railway Co. Depot-Weldon | |
| C.S. Stearns House | |
| Union Church |
Emmet County
Grundy County
Guthrie County
Hamilton County
Howard County
| Bohemian Savings Bank | |
| Cresco Opera House | |
| James C. Fellows House | |
| Howard County Courthouse | |
| Kellow House | |
| Lime Springs Mill Complex | |
| Polygonal Barn, New Oregon Township |
Former listing
Humboldt County
| Berkhimer Bridge | |
| Corydon Brown House | |
| Humboldt County Court House | |
| Humboldt Free Public Library | |
| Renwick Generating Plant | |
| Stephen Harris Taft House |
Former listing
Ida County
| Alvin Bushnell Bell House | |
| Ida County Courthouse | |
| Moorehead Stagecoach Inn | |
| Dr. Francis B. Warnock House | |
| Waveland Round Barn |
Kossuth County
Louisa County
Mills County
O'Brien County
Osceola County
Palo Alto County
Pocahontas County
Ringgold County
| Beaconsfield Supply Store | |
| Middlefork Methodist Episcopal Church | |
| Ringgold County Courthouse | |
| Ringgold County Jail | |
| Lee Shay Farmhouse |
Former listings
Sioux County
| Charles M. and Emma M. Fischer Fleshman House | |
| Hawarden City Hall, Fire Station and Auditorium | |
| Sioux County Courthouse | |
| Zwemer Hall, Northwestern College |
Taylor County
| Bedford Commercial Historic District | |
| Bedford House | |
| Bedford Oil Company Station | |
| Bedford Public Library | |
| Lenox Hotel | |
| Lenox Round Barn | |
| Taylor County Courthouse |
Union County
| Chicago, Burlington and Quincy Railroad-Creston Station | |
| Grand River Bridge | |
| Iowana Hotel | |
| Jefferson Elementary School | |
| Odd Fellows Block | |
| U.S. Post Office |
Wayne County
Winnebago County
Former listings
Worth County