Belleville, Illinois

Belleville is a city and the county seat of St. Clair County, Illinois, United States. It is located within Greater St. Louis. The population was 42,404 at the 2020 census, making it the most-populated city in Southern Illinois and in the Metro East region of Greater St. Louis. Due to its proximity to Scott Air Force Base, the population receives a boost from military and federal civilian personnel, defense contractors, and military retirees. It is also the seat of the Roman Catholic Diocese of Belleville and the National Shrine of Our Lady of the Snows.

Belleville, Illinois
City
St. Clair County Courthouse
Belleville
Belleville
Coordinates: 38°31′18″N 89°59′43″W
Country United States
State Illinois
County St. Clair
Founded1814
Government
  MayorPatty Gregory
Area
  Total23.49 sq mi (60.84 km2)
  Land23.23 sq mi (60.17 km2)
  Water0.26 sq mi (0.67 km2)
Elevation
502 ft (153 m)
Population
 (2020)
  Total42,404
  Density1,825.16/sq mi (704.71/km2)
Time zoneUTC−6 (CST)
  Summer (DST)UTC−5 (CDT)
ZIP code(s)
62220-62223, 62225, 62226
Area code618
FIPS code17-163-04858
GNIS feature ID2394118
Websitebelleville.net
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