St. Charles County, MO Zip Codes
12 zip codes across 8 cities in St. Charles County, MO
About St. Charles County
St. Charles County, Missouri (MO) contains 12 unique zip codes spanning 8 cities and communities. Each zip code covers a different area within the county, with varying demographics, income levels, and housing markets.
Browse the complete list below to find detailed population, income, home values, cost of living, and climate data for any zip code in St. Charles County.
Cities in St. Charles County
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All Zip Codes in St. Charles County, MO
| Zip Code | City |
|---|---|
| 63301 | Saint Charles |
| 63303 | Saint Charles |
| 63304 | Saint Charles |
| 63332 | Augusta |
| 63341 | Defiance |
| 63348 | Foristell |
| 63366 | O Fallon |
| 63367 | O Fallon |
| 63373 | Portage Des Sioux |
| 63376 | Saint Peters |
| 63385 | Wentzville |
| 63386 | Portage Des Sioux |
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Frequently Asked Questions
How many zip codes are in St. Charles County, MO?
St. Charles County, MO has 12 zip codes across 8 cities.
What cities are in St. Charles County?
Cities in St. Charles County include Augusta, Defiance, Foristell, O Fallon, Portage Des Sioux, Saint Charles, Saint Peters, Wentzville.
What state is St. Charles County in?
St. Charles County is located in Missouri (MO).
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.