St. Charles, MO ZIP Codes
St. Charles, Missouri has 4 ZIP codes: 3 for street addresses (, and ) and 1 for PO boxes ().
Your street decides which one you use.
Which St. Charles ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
St. Charles ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
63302 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: St. Charles city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All St. Charles ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 63301 | street delivery; mail may be addressed to Saint Charles Saint Charles |
| 63302 | PO boxes at the Saint Charles post office Saint Charles |
| 63303 | street delivery; mail may be addressed to Saint Charles Saint Charles South |
| 63304 | street delivery; mail may be addressed to Saint Charles Saint Charles South |
Why your mail may say St. Charles when you live outside it
St. Charles ZIP codes also cover Weldon Spring, Cottleville and Weldon Spring Heights, so a letter addressed to St. Charles can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. St. Charles County property records show which city you are in.
St. Charles ZIP code questions
What is the main ZIP code for St. Charles?
63301, the ZIP code of the main Saint Charles post office at 1890 1st Capitol Dr.
Which St. Charles ZIP codes are for PO boxes only?
63302. Mail to it goes to boxes at the post office, not to street addresses.
What county is St. Charles in?
St. Charles County.
ZIP codes for towns near St. Charles
More towns near St. Charles: Wildwood, St. Louis, Wentzville, Oakville, Belleville, O'Fallon, Springfield, Jefferson City, Quincy.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections