St. Clair County, Illinois

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St. Clair County, Illinois
Downtown Belleville Illinois Courthouse.jpg
Flag of St. Clair County, Illinois
Flag
Location within Illinois
Location within Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Founded1790
Named forArthur St. Clair
SeatBelleville
Largest cityBelleville
Area
 • Total674 sq mi (1,746 km2)
 • Land658 sq mi (1,704 km2)
 • Water16 sq mi (41 km2), 2.4%
Population
 • (2010)270,056
 • Density411/sq mi (159/km2)
Congressional district12th
Time zoneCentral: UTC−6/−5
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.