Iowa - Area of significance: Social History
| 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) |
| Pleasant Grove Community Church and Cemetery |
| Pottawattamie County Jail |
| Prairie Center Methodist Episcopal Church and Pleasand Hill Cemetery |
| Presbyterian Church |
| Price, Hiram/Henry Vollmer House |
| Pucker Street Historic District |
| Redfield GAR Hall |
| Red Oak Grove Presbyterian Church and Cemetery |
| Royal Neighbors of America National Home Historic District |
| Russell, Rensselaer, House |
| Sac City Monument Square Historic District |
| Saints Peter and Paul Roman Catholic Church Historic District |
| Sanford, Arthur and Stella, House |
| Second Baptist Church |
| Sherman, Hoyt, Place |
| Siebels' Department Store-Boyer Valley Bank |
| Sigma Sigma-Delta Chi Fraternity House |
| Snake Alley Historic District |
| Sokol Gymnasium |
| Southeast Water Trough |
| Spencer High School and Auditorium |
| Springbrook State Park, Civilian Conservation Corps Area |
| Starker-Leopold Historic District |
| Stewart Library |
| St. John's Danish Evangelical Lutheran Church Historic District |
| St. Luke's Hospital |
| Stokes, Dr. Ella, House |
| St. Olaf Auditorium |
| Storm Lake Public Library |
| Sumner School |
| Sylvan Theater Historic District |
| Tabor Congregational Church |
| Tate Arms |
| Todd House |
| Trappers Bay State Park Picnic Shelter |
| Ulysses Simpson Grant Elementary School |
| Union Cemetery Gardener's Cottage |
| Village of St. Donatus Historic District |
| Vinton Public Library |
| Wanata State Park Picnic Shelter |
| Washington Park |
| Waterloo East Commercial Historic District |
| Waterloo Masonic Temple |
| Waverly East Bremer Avenue Commercial Historic District |
| West Liberty Fairgrounds Historic District |
| West Paint Creek Synod Evangelical Lutheran Church and Cemetery |
| West Union Commercial Historic District |
| Wickiup Hill Mound Group No. 2 |
| Wickiup Hill Mound Group No. 3 |
| Wickiup Hill Mound Group No. 4 |
| Wilson, Paton and Hannah, House |
| Wilton Candy Kitchen |
| Wilton Commercial Historic District |
| Winterset Courthouse Square Commercial Historic District |
| Women's Christian Temperance Union Public Fountain |
| Woodbine Normal and Grade School |
| W. R. C. Hall |
| Young, Alexander, Cabin |
Data from United States Park Service and Wikidata
