St. Clair County, Illinois

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St. Clair County
St. Clair County Courthouse, Belleville
Flag of St. Clair County
Flag
Map of Illinois highlighting St. Clair County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 38°28′N 89°56′W / 38.47°N 89.93°W / 38.47; -89.93
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

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.

References[change | change source]

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