St. Clair County, Illinois - Simple English Wikipedia, the free encyclopedia
St. Clair County | |
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![]() St. Clair County Courthouse in Belleville | |
![]() 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 | ![]() |
State | ![]() |
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 |
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.
References
[change | change source]- ↑ 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.