There are 6 zip codes in St. Clair County, Missouri. The most populated is 64776, located in Osceola. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
647763,521Osceola
647242,090Appleton City
647631,462Lowry City
647381,337Collins
64780423Rockville
64781110Roscoe

Zip Codes in St. Clair County, Missouri by Population (2024)