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St. Clair County, Illinois
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St. Clair County, Illinois Map
An detailed map of St. Clair County. Click on a nearby County to view more information about that County.
Map of Townships in St. Clair County, Illinois
An interactive map of county subdivisions in St. Clair County. In Illinois, that can include Townships, Precincts, and Villages. Find what township you are in now.
Map of Counties in Illinois
An interactive map of Counties in Illinois. Click on a County to view more information about that County.
About St. Clair County, 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.
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This site has an interactive map of Illinois Counties. Click on the map to find your Illinois county, and view more details. You can also search for your address and use your GPS to find your Illinois County.
Find what County you are in, and see official Illinois County resources and information. Find any county in the United Stated, along with resources and links to official County websites. See a County map and local details. Looking for what county you are currently in? Find out on this map or use your device GPS to see what county you are in.