Iowa - Area of significance: Social History
| Gull Point State Park, Area A |
| Gull Point State Park, Area B |
| Hamburg Historic District |
| Hamburg Public Library |
| Hardacre Theater |
| Hardin County Home Historic District |
| Harlan-Lincoln House |
| Harriman, Dr. O. B., House |
| Harris, Dr. Percy and Lileah, House |
| Harvat, Emma J., and Mary E. Stach House |
| Hauschild's Hall |
| Helvig-Olson Farm Historic District |
| Heritage Hill Historic District |
| Hibernia Hall |
| Hickman-Nietert-Odd Fellows Building |
| Historic Railroad District |
| Hitchcock, Rev. George B., House |
| Holy Ghost Catholic Historic District |
| Hotel Ottumwa |
| Hotel Russell-Lamson |
| Hotel Whitney |
| I.O.O.F. Hall |
| I.O.O.F. (International Order of Odd Fellows) Valley Junction Lodge Hall No. 604 |
| Iowa Commission for the Blind Building |
| Iowa Federation Home for Colored Girls |
| Iowan's Hotel |
| Iowa Soldiers' Orphans' Home |
| Iowa State Highway Commission, District 6 Building |
| Irwin Consolidated School |
| Jefferson Elementary School |
| Johnson County Poor Farm and Asylum Historic District |
| Johnson, George, House |
| Johnstone, Dr. Anna E. and Andrew A., House |
| Jones Business College |
| Jordan House |
| Kent Union Chapel and Cemetery |
| Keokuk Young Women's Christian Association Building |
| Kirchner, Philip and Anna Parrish, Log House |
| Kvindherred Lutheran Church, School and Cemetery |
| Lacey-Keosauqua State Park, Bathing Area (Area C) |
| Lacey-Keosauqua State Park, Lodge and Picnic Area (Area A) |
| Lacey-Keosauqua State Park, Picnic and Custodial Group (Area B) |
| Lake Ahquabi State Park, Bathhouse Area (Area B) |
| Lake Ahquabi State Park, Picnic Area (Area A) |
| Lake Ahquabi State Park, Refectory Area (Area C) |
| Lake City Community Memorial Building |
| Lake City Public Library |
| Lake City Water Standpipe |
| Lake Keomah State Park, Bathhouse-Lodge Area (Area A) |
| Lake Keomah State Park, Erosion Control Area (Area B) |
| Lane, Lucius and Maria Clinton, House |
| Laurens Carnegie Free Library |
| LeClaire, Antoine, House |
| Le Mars Municipal Park and Golf Course Historic District |
| Lenox Township Church of the New Jersalem |
| Lewelling, Henderson, House |
| Lincoln School |
| Lincoln School |
| Lisbon Methodist Church |
| Lock and Dam No. 11 Historic District |
| Lock and Dam No. 12 Historic District |
| Lock and Dam No. 14 Historic District |
| Lock and Dam No. 16 Historic District |
| Lock and Dam No. 19 Historic District |
| Logan Center School No.5 |
| Louis F. and Emma M. (Edler) Wohlert House-Emma Wohlert Maternity Home |
| Luther A. and Elinore T. Brewer House |
| Manning Commercial Historic District |
| Maple View Sanitarium |
| Maquoketa Free Public Library |
| Marion Commercial Historic District |
| Mary Elizabeth Day Nursery |
| Mason City YMCA |
| McKibben, S. M., House |
| McKinley Elementary School |
| Memorial Building |
| Methodist Deaconess Institute-Esther Hall |
| Milwaukee Railroad Shops Historic District |
| Mini-Wakan State Park Historic District |
| Modale School and Masonic Hall |
| Moorehead Stagecoach Inn |
| Moore, Josiah B. and Sara, House |
| Munson Building |
| Muscatine County Home Dairy Barn |
| Northwest Davenport Turner Society Hall |
| Oak Hill Cemetery Historic District |
| Odd Fellows Block |
| Old Settlers' Association of Johnson County Cabins |
| Old Settlers' Association Park and Rhodham Bonnifield House |
| Onawa IOOF Opera House |
| Osceola Masonic Block |
| Ottumwa Young Women's Christian Association |
| Parker's Woods Park Historic District |
| Park/Glen Avenues Historic District |
| Pella High School |
| Pierson-Betts House |
| Pikes Point State Park Shelter and Steps |
| Pillsbury Point State Park |
| Pilot Knob State Park, Amphitheater (Area 4) |
| Pilot Knob State Park, Observation Tower (Area 2) |
Data from United States Park Service and Wikidata
