City · Missouri · United States
O Fallon, MO — ZIP codes
2 ZIP codes · Saint Charles County
- City
- O Fallon
- County
- Saint Charles
- State
- Missouri
- Country
- United States
- Postal codes
- 6336663368Single source
- Coordinates
- 38.8239, -90.7427 View on OpenStreetMap
ZIP codes (2)
Sources and verification
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames. Last generated : 2026-08-21. Report an error.