St. Clair County, Illinois
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, Illinois | |
| |
| Map | |
 Location in the state of Illinois | |
 Illinois's location in the U.S. | |
| Statistics | |
| Founded | 1790 |
|---|---|
| Seat | Belleville |
| Largest City | Belleville |
| Area - Total - Land - Water |
674 sq mi (1,746 km²) 658 sq mi (1,704 km²) 16 sq mi (41 km²), 2.4 |
| Population - Density |
|
| Time zone | Central: UTC-6/-5 |
| Website: www.co.st-clair.il.us | |
| Named for: Arthur St. Clair | |
| County flag | 
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St. Clair County, Illinois Media
House in Lebanon, Il historic district
Mermaid House Hotel, Lebanon, Illinois
Map of the East St. Louis and Suburban Company c 1912
St. Clair County as it was re-established in 1809. This diagonal border line had been drawn by the Indiana Territorial government in 1803.
St. Clair County between 1812 and 1813
St. Clair County between 1813 and 1816
St. Clair County between 1816 and 1818
St. Clair County between 1818 and 1825
St. Clair County between 1825 and 1827
St. Clair County from 1827 to present
References
- ↑ "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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