St. Clair County, Illinois
St. Clair County is the oldest county in the U.S. state of Illinois. According to the 2010 census, it had a population of 270,056,[1] making it the eighth-most populous county in Illinois and the most populous in the southern part of the state. 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, Belleville | |
 Flag | |
 Location within the U.S. state of Illinois | |
 Illinois's location within the U.S. | |
| Coordinates: 38°28′N 89°56′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 (2010) | |
| • Total | 270,056 |
| • Density | 411/sq mi (159/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 12th |
| Website | www |
References
- "State & County QuickFacts". United States Census Bureau. Archived from the original on July 20, 2011. Retrieved July 8, 2014.
- "Find a County". National Association of Counties. Retrieved 2011-06-07.
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