St. Clair County, Illinois
county in Illinois, United States
St. Clair County is the oldest county in the U.S. state of Illinois. According to the 2020 census, it had a population of 257,400,[1] making it the ninth-most populous county in Illinois. Its county seat is Belleville.[2] The county was founded in 1790, before the establishment of Illinois as a state.
St. Clair County | |
|---|---|
 St. Clair County Courthouse in Belleville | |
 Flag  Seal | |
 Location within the U.S. state of Illinois | |
 Illinois's location within the U.S. | |
| Coordinates: 38°28′N 89°56′W / 38.47°N 89.93°W | |
| Country |  United States |
| State |  Illinois |
| Founded | 1790 |
| Named for | Arthur St. Clair |
| Seat | Belleville |
| Largest city | Belleville |
| Area | |
| • Total | 674 sq mi (1,750 km2) |
| • Land | 658 sq mi (1,700 km2) |
| • Water | 16 sq mi (40 km2) 2.4% |
| Population | |
| • Total | 257,400 |
| • Density | 380/sq mi (150/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Website | www |
References
change- ↑ 1.0 1.1 "QuickFacts: St. Clair County, Illinois". United States Census Bureau. Retrieved August 14, 2023.
- ↑ "Find a County". National Association of Counties. Retrieved 2011-06-07.
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