St. Clair County Map, Illinois
Detailed road and geographic map of St. Clair County.
County Information
- State: Illinois
- FIPS Code: 17163
- Population: 257,400
- Area (sq mi): 657.8
- Density: 391.3/sq mi
- Growth Trend: +1.2%
- Households: 114,595
- Election Data: Republican
- Climate Zone: Mixed/Moderate
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Overview
St. Clair County is located in the U.S. state of Illinois. It has a land area of approximately 657.8 square miles.