St. Clair County, Missouri

St. Clair County is a county in Missouri with an estimated population of 9,752 in 2023. 3 cities, towns and Census places in it are indexed here.

Largest places in St. Clair County

About St. Clair County

St. Clair County is one of the counties of Missouri. County governments in Missouri handle local services such as courts, property records and elections; cities and towns inside the county run their own municipal services. Population figures come from the Census Bureau's Vintage 2023 estimates, which are updated annually.