Towns
| State | City/Town | Town Title |
|---|---|---|
| Michigan | Omena | Omena, MI |
| Michigan | Omer | Omer, MI |
| Michigan | Onaway | Onaway, MI |
| Michigan | Onekama | Onekama, MI |
| Michigan | Onondaga | Onondaga, MI |
| Michigan | Onsted | Onsted, MI |
| Michigan | Ontonagon | Ontonagon, MI |
| Michigan | Orleans | Orleans, MI |
| Michigan | Ortonville | Ortonville, MI |
| Michigan | Oscoda | Oscoda, MI |
| Michigan | Oshtemo | Oshtemo, MI |
| Michigan | Osseo | Osseo, MI |
| Michigan | Ossineke | Ossineke, MI |
| Michigan | Otisville | Otisville, MI |
| Michigan | Otsego | Otsego, MI |
| Michigan | Ottawa Lake | Ottawa Lake, MI |
| Michigan | Otter Lake | Otter Lake, MI |
| Michigan | Ovid | Ovid, MI |
| Michigan | Owendale | Owendale, MI |
| Michigan | Owosso | Owosso, MI |
| Michigan | Oxford | Oxford, MI |
| Michigan | Painesdale | Painesdale, MI |
| Michigan | Palmer | Palmer, MI |
| Michigan | Palms | Palms, MI |
| Michigan | Palmyra | Palmyra, MI |