St. Clair County, Illinois

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St. Clair County
St. Clair County Courthouse in Belleville
St. Clair County Courthouse in Belleville
Flag of St. Clair County
Official seal of St. Clair County
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
Named forArthur St. Clair
Largest cityBelleville
 • Total674 sq mi (1,750 km2)
 • Land658 sq mi (1,700 km2)
 • Water16 sq mi (40 km2)  2.4%
 • Total257,400
 • Density380/sq mi (150/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)

St. Clair County is the oldest county in the U.S. state of Illinois. According to the 2020 census, it had a population of 257,400,[1] making it the ninth-most populous county in Illinois. 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. 1.0 1.1 "QuickFacts: St. Clair County, Illinois". United States Census Bureau. Retrieved August 14, 2023.
  2. "Find a County". National Association of Counties. Retrieved 2011-06-07.