- Osceola
- Oscoda
- Oscoda Mobile Home Park
- Oshtemo
- Oskar
- Ossawinamakee Beach
- Osseo
- Ossineke
- Otisville
- Otsego
- Otsego Lake
- Ottawa
- Ottawa Center
- Ottawa Lake
- Otter Lake
- Ottogan Mobile Home Estates
- Outer Hill Island
- Outer Island
- Overisel
- Ovid
- Owendale
- Owasso
- Owosso Trailer Park
- Oxbow
- Oxbow
- Oxbow
- Oxbow
- Oxbow Park
- Oxford
- Ozark