St. Peters, MO ZIP Codes
St. Peters, Missouri has 2 ZIP codes: 2 for street addresses ( and ).
Your street decides which one you use.
Which St. Peters 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. Peters ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
Dashed line: St. Peters city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All St. Peters ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 63304 | street delivery; mail may be addressed to Saint Charles Saint Charles South |
| 63376 | street delivery; mail may be addressed to Saint Peters Saint Peters |
ZIP codes from nearby towns that reach into St. Peters
- 63303, mailing town Saint Charles, covers 3 percent of St. Peters
Why your mail may say St. Peters when you live outside it
St. Peters ZIP codes also cover Weldon Spring, Cottleville and Weldon Spring Heights, so a letter addressed to St. Peters can go to a home outside the city limits.
The reverse happens too: parts of St. Peters use 63303, which mails under a neighboring town's name.
A ZIP code does not set your city, school district or tax. St. Charles County property records show which city you are in.
St. Peters ZIP code questions
What is the main ZIP code for St. Peters?
63304, the ZIP code of the main Saint Charles South post office at 1600 Woodstone Dr.
What county is St. Peters in?
St. Charles County.
ZIP codes for towns near St. Peters
More towns near St. Peters: Florissant, University City, St. Louis, Oakville, Belleville, O'Fallon, Jefferson City, Springfield, 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