St. Clair County Map, Illinois
St. Clair County Map Collection
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St. Clair County, Illinois
St. Clair County sits right across the Mississippi River from St. Louis. Belleville, the county seat, is the largest city. It’s a place of contrasts. You’ve got urban grit and rural areas. But there’s also blue-collar neighborhoods and upscale suburbs.
St. Clair County feels like a blend of Midwest and Gateway City. It’s complex, diverse, and always evolving. East St. Louis has seen tough times, but there’s resilience here. The county has deep roots. It was founded in 1790, making it one of the oldest in Illinois.
Scott Air Force Base is a major employer and shapes the local culture. You’ll see a lot of military folks around. The riverfront casino draws crowds. So does Cahokia Mounds, a UNESCO World Heritage site.
| Category | Details |
|---|---|
| County Name | St. Clair County |
| County Seat | Belleville |
| Population | Approximately 265,000 |
| Cities, Towns, and Communities | Belleville, East St. Louis, O’Fallon, Cahokia, Fairview Heights, Swansea, and several smaller communities |
| Interstates and Highways | Interstate 64, Interstate 55, Interstate 255, U.S. Route 50, U.S. Route 61, U.S. Route 40 |
| FIPS Code | 17-163 |
| Total Area (Land and Water) | 658 square miles (land: 657 sq mi, water: 1 sq mi) |
| Adjacent Counties (and Direction) | Madison County (North), Clinton County (Northeast), Washington County (East), Randolph County (South), Monroe County (Southwest), St. Louis, Missouri (West), St. Louis County, Missouri (West) |
| Time Zone | Central Time Zone (CT) |
| State | Illinois |
| Coordinates | 38.5369° N, 90.0734° W |
| Etymology | Named in honor of Arthur St. Clair, a major general in the American Revolutionary War |
| Major Landmarks | The Gateway Arch, Cahokia Mounds, Belleville Historic District, and Scott Air Force Base |
PHYSICAL MAP
St. Clair County Topographic Map
The landscape of St. Clair County varies from Mississippi River floodplain to rolling hills. Floodplains near the Mississippi River transition to higher, flatter land eastward.
SATELLITE IMAGERY
St. Clair County Satellite Map
Urban areas like Belleville and East St. Louis stand out near the Mississippi. Farmland and bluffs fill the rest. Major highways (I-64, I-255) cut clear paths.
OUTLINE MAP
St. Clair County Blank Map
The Mississippi River forms its western border, facing Missouri. The rest has straight lines, typical of Illinois counties.
Neighboring Counties
Here are the 7 neighboring counties of St. Clair County:
Illinois County Map
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