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St. Clair County, Illinois

US county information
NameSt. Clair County
StateIllinois
SeatBelleville
US Area
Total Area673.95 sq mi (1745.5 km2)
Land Area663.81 sq mi (1719.3 km2)
Water Area10.15 sq mi (26.3 km2)
Population270056 (2010)
Density151.7/km2 (393.0/sq mi)
Named forArthur St. Clair
Time zoneCentral

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St. Clair County is a county located in the U.S. state of Illinois, and determined by the U.S. Census Bureau to include the mean center of U.S. population in 1970. As of the 2010 census, the population was 270,056. Its county seat is Belleville. St. Clair County is part of the Metro-East.

It is a part of the St. Louis Metropolitan Area.


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