St. Clair County, Illinois

St. Clair County
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
Founded1790
Named forArthur St. Clair
SeatBelleville
Largest cityBelleville
Area
 • Total
674 sq mi (1,750 km2)
 • Land658 sq mi (1,700 km2)
 • Water16 sq mi (40 km2)  2.4%
Population
 (2020)
 • Total
257,400
 • Estimate 
(2023)
251,018 Decrease
 • Density380/sq mi (150/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional districts12th, 13th
Websitewww.co.st-clair.il.us
House in Lebanon, Il historic district
Mermaid House Hotel, Lebanon, Illinois

St. Clair County is the ninth most populous county in Illinois. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area in southern Illinois. As of the 2020 United States census, St. Clair County had a population of 257,400, making it the third most populous county in Illinois outside the Chicago metropolitan area. Belleville is the county’s seat and largest city.[1] Cahokia Village was founded in 1697 by French settlers and served as a Jesuit mission to convert tribes of the Illinois Confederation to Christianity. Prior to the establishment of Illinois as a state, the government of the Northwest Territory created St. Clair County in 1790 out of the western half of Knox County. In 1809, the county became the administrative center of the Illinois Territory and one of the two original counties of Illinois, alongside Randolph County. In 1970, the United States Census Bureau placed the mean center of U.S. population in St. Clair County.[2]

  1. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  2. ^ "Mean Center of Population for the United States: 1790 to 2000" (PDF). US Census Bureau. Archived from the original (PDF) on November 3, 2001. Retrieved September 17, 2011.

St. Clair County, Illinois

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