- Otterbein
- Oak Grove
- Oak Park Mobile Home Park
- Orrville Trailer Park
- Overton
- Oak Meadows
- Oakmont
- Orchard View
- Otsego
- Otter Island
- Oakland
- Orpheus
- Olszeski Town
- Osage
- Overlook Hills
- Orchard Mobile Home Park
- Okey
- Olive Furnace
- Outville
- O'Connor Point
- Orchard Island
- Oakwood Acres
- Oak Hill
- Ohltown
- Oak Knoll
- Oakland Mobile Home Park
- Owens
- Oakwood
- Oberlin
- Obetz