Ontonagon County ZIP Codes
Michigan, United States · 9 codes
Ontonagon County in Michigan has 9 ZIP codes, from 49910 to 49971, serving 9 places.
ZIP codes in Ontonagon
Frequently asked questions
What is the ZIP code of Ontonagon?
Ontonagon has 9 ZIP codes, from 49910 to 49971. The table lists the places each one serves.
How many places are listed in Ontonagon County?
9 places.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.