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| Lighthouse |
| Metro and City Park |
| National Forest |
| National Historic Landmark |
| National Historic Site |
| National Historical Park |
| National Memorial |
| National Park |
| National Recreation Area |
| National Seashore |
| National Wildlife Area |
| National Wildlife Refuge |
| State Fish Hatchery |
| State Fishery Area |
| State Forest |
| State Historic Site |
| State Memorial |
| State Natural Area |
| State Nature Preserve |
| State Nursery |
| State Park |
| State Preserve |
| State Recreation Area |
| State Reserve |
| State Wildlife Area |
| State Wildlife Management Area |
| State Wildlife Refuge |
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| Clinton Lake State Recreation Area | State Recreation Area | 15.8 | De Witt | Illinois |
| Weldon Springs State Park | State Park | 22.3 | Clinton | Illinois |
| Railsplitter State Park | State Park | 40.3 | Lincoln | Illinois |
| Spitler Woods State Park | State Park | 44.1 | Mount Zion | Illinois |
| Lincoln Trail Homestead State Park | State Park | 46.3 | Decatur | Illinois |
| Fort Creve Coeur State Park | State Park | 48.5 | Creve Coeur | Illinois |
| Middle Fork State Fish and Wildlife Areas | State Wildlife Area | 51 | Oakwood | Illinois |
| West Okaw River State Fish and Wildlife Mgmt Area | State Wildlife Area | 54.8 | Sullivan | Illinois |
| Kickapoo State Park | State Park | 56.1 | Oakwood | Illinois |
| Cameron National Wildlife Refuge | National Wildlife Refuge | 57.1 | Henry | Illinois |