Iowa - Area of significance: Landscape Architecture
| Ashby Manor Historic District |
| Aspen Grove Cemetery Historic District |
| Backbone State Park, Cabin-Bathing Area (Area A) |
| Backbone State Park, Picnicking, Hiking & Camping Area (Area B) |
| Backbone State Park, Richmond Springs (Area C) |
| Beeds Lake State Park, Civilian Conservation Corps Area |
| Benham, F. A., House |
| Bever Woods Historic District |
| Blackhawk State Park, Black Hawk Preserve (Area B) |
| Blackhawk State Park, Denison Beach Area (Area C) |
| Blackhawk State Park, Wildlife Preserve Area (Area A) |
| Carroll City-Mount Olivet Cemetery |
| Chariton Cemetery Historic District |
| Chautauqua Park Historic District |
| Civic Center Historic District |
| Clear Lake Lake Wall |
| Cook, Clarissa, Home for the Friendless |
| Crapo Park and Arboretum Historic District |
| Dolliver Memorial State Park, Entrance Area (Area A) |
| Dolliver Memorial State Park, Picnic, Hiking & Maintenance Area (Area B) |
| Eagle Point Park Historic District |
| East Park Historic District |
| Edmundson Park Historic District |
| Elmwood-St. Joseph Municipal Cemetery Historic District |
| Flynn Farm, Mansion, and Barn |
| Geode State Park, Civilian Conservation Corps Area |
| Graham Park Historic District |
| Grotto of the Redemption |
| Gull Point State Park, Area A |
| Gull Point State Park, Area B |
| Heritage Hill Historic District |
| Historic Railroad District |
| Iowa Men's Reformatory 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 Keomah State Park, Bathhouse-Lodge Area (Area A) |
| Lake Keomah State Park, Erosion Control Area (Area B) |
| Miller, Alvin, House |
| Milwaukee Railroad Shops Historic District |
| Mini-Wakan State Park Historic District |
| Oak Hill Cemetery Historic District |
| Oakland Cemetery |
| Oaklands, The, Historic District |
| Old Town Historic District |
| 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) |
| Pilot Knob State Park, Picnic Shelter (Area 3) |
| Pilot Knob State Park, Portals (Area 5a) |
| Pilot Knob State Park: Portals in Area 5b |
| Pilot Knob State Park, Trail Area (Area 6a-6c) |
| President's Cottage |
| Prospect Park Second Plat Historic District |
| Riverview Park Plat Historic District |
| Schlapp, George E., House |
| Sharon Cemetery Historic District |
| Sinnett Octagon House |
| Springbrook State Park, Civilian Conservation Corps Area |
| Spring Creek Friends Cemetery |
| Squirrel Hollow County Park Historic District |
| Starker-Leopold Historic District |
| Sylvan Theater Historic District |
| Trappers Bay State Park Picnic Shelter |
| Vander Veer Park Historic District |
| Wanata State Park Picnic Shelter |
| Wapsipinicon State Park Historic District |
| Wildwood Park Historic District |
| Winterset City Park Historic District |
Data from United States Park Service and Wikidata
