ZIP Codes in Ontonagon, MI
Ontonagon uses 1 ZIP code, all in Ontonagon County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 1 Ontonagon ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 49953 | standard | Ontonagon | 2,368 |
Finding a ZIP+4 in Ontonagon
Knowing which of these 1 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Ontonagon street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Ontonagon addresses and download it complete.