Frontier zip code
Zip code in Frontier, MI
The location Frontier belongs to Hillsdale County, state of Michigan. Frontier has been assigned with the zip code 49239.
Frontier is the official name of the location so if you want to use the US Postal Service you must use that name.
| Zip code | Type | Population |
|---|---|---|
| 49239 | PO BOX | 109 |
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