St. Clair County, Illinois

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St. Clair County is a county located in the state of Illinois, and determined by the U.S. Census Bureau to include the mean center of U.S. population in 1970. As of 2000, the population is 256,082. Its county seat is Belleville, Illinois.

Related Topics:
County - State - Illinois - U.S. Census Bureau - Mean center of U.S. population - 1970 - 2000 - County seat - Belleville, Illinois

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It is a part of the St. Louis metropolitan area. St. Clair County is also the first county established in the state of Illinois. Its existence actually precedes the state of Illinois as it was one of two counties established in the Northwestern Territories in 1790.

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