- Oakgrove
- Oakland
- Oakland
- Oakland
- Oakland
- Oakland
- Oakland Mobile Home Park
- Oakley
- Oakley Square
- Oakmont
- Oakmont Creek
- Oakmont Village
- Oakshade
- Oakthorpe
- Oakview
- Oakwood
- Oakwood Acres
- Oakwood Mobile Home Park
- Oakwood Village
- Oberlin
- Oberlin Beach
- Obetz
- Oceola
- Oco
- Octa
- Odell
- Offenbacher Mobile Home Park
- Ogden
- Ogontz
- Ohio City