City · Michigan · United States
Frontier, MI — ZIP codes
1 ZIP code · Hillsdale County
- City
- Frontier
- County
- Hillsdale
- State
- Michigan
- Country
- United States
- Postal code
- 49239Single source
- Coordinates
- 41.7825, -84.6047 View on OpenStreetMap
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 49239 | Frontier | 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. Last generated : 2026-08-21. Report an error.