St. Clair County ZIP Codes

List of ZIP Codes in St. Clair County

The following table lists ZIP Codes associated with St. Clair County, Missouri, based on ZIP Code Tabulation Area (ZCTA) data from the U.S. Census Bureau.

About St. Clair County ZIP Codes

St. Clair County in Missouri (MO) is served by approximately 6 ZIP Codes. These codes cover residential neighborhoods, business districts, and rural areas that fall under the county's jurisdiction.

Based on ZIP-level population estimates, the total population covered by these ZIP Codes is around 8,771 people. Population and density values vary from one ZIP Code to another, reflecting the mix of dense urban communities and lower-density suburban or rural zones.

Many of the most significant population centers in St. Clair County are located in cities such as Osceola, Appleton City, Lowry City, Collins, Rockville. These cities and towns help define the economic and demographic character of the county.

Most ZIP Codes in St. Clair County, Missouri follow the America/Chicago time zone.