St. Clair County

St. Clair County

POPULATION
257,400
AREA
674 mi²

About

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.

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Details

Location

Illinois United States

Coordinates

38.47020° N, 89.92855° W