Saint Clair County, county in Missouri, United States. As of 2020 county had an estimated population of 9,689 inhabitants. The county was created 181 years ago in 1841. Its county seat is "Osceola".
There are 1 city/town in Saint Clair County, MO. The largest city of Saint Clair County is Appleton City with a population of 1,080.
Cities, Towns, Neighborhoods & Other Populated Places in Saint Clair County.
|Appleton City||City in St.||Saint Clair||1,080|