| Ortschaft | Postleitzahl |
|---|---|
| Bergland, Ontonagon | 49910 |
| Bruce Crossing, Ontonagon | 49912 |
| Ewen, Ontonagon | 49925 |
| Greenland, Ontonagon | 49929 |
| Marenisco, Ontonagon | 49947 |
| Mass City, Ontonagon | 49948 |
| Ontonagon, Ontonagon | 49953 |
| Rockland, Ontonagon | 49960 |
| Trout Creek, Ontonagon | 49967 |
| White Pine, Ontonagon | 49971 |