City · Ohio · United States
Mason, OH — ZIP codes
1 ZIP code · Warren County
- City
- Mason
- County
- Warren
- State
- Ohio
- Country
- United States
- Postal code
- 45040Single source
- Coordinates
- 39.3357, -84.3149 View on OpenStreetMap
- Area codes
- 513, 283
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 45040 | Mason | Single source |
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 · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Last generated : 2026-08-21. Report an error.