| name | image | heritage designation | type | Area (m²) | date founded | latitude (°) | longitude (°) | Website | Map |
|---|---|---|---|---|---|---|---|---|---|
| Indiana Dunes State Park | National Natural Landmark | Park | 1925 | 41.6666679382 | -87.0333328247 | website | Map | ||
| Gifford Woods State Park |  | National Natural Landmark | Park | 161,875 | 1931 | 43.6666679382 | -72.8000030518 | website | Map |
| Orient Beach State Park |  | National Natural Landmark | Park | 10/1929 | 41.1166648865 | -72.2500000000 | website | Map | |
| Cedars of Lebanon State Park |  | National Natural Landmark | Park | 3,642,185 | 36.0666656494 | -86.3000030518 | website | Map | |
| Harrison Spring |  | National Natural Landmark | Reservations/Natural Type | 38.2333335876 | -86.2166671753 | website | Map |