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
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
Founded1790
Named forArthur St. Clair
SeatBelleville
Largest cityBelleville
Area
  Total674 sq mi (1,750 km2)
  Land658 sq mi (1,700 km2)
  Water16 sq mi (40 km2)  2.4%%
Population
 (2010)
  Total270,056
  Density411/sq mi (159/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district12th
Websitewww.co.st-clair.il.us

References

  1. "State & County QuickFacts". United States Census Bureau. Archived from the original on July 20, 2011. Retrieved July 8, 2014.
  2. "Find a County". National Association of Counties. Retrieved 2011-06-07.
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