- Oak Island
- Old Campbellwood Wye
- Oahu Island
- Oak Beach
- Oak Hill
- Oak Hill
- Oak Hill Landing
- Oak Island
- Oak Meadows Mobile Home Park
- Oak Orchard
- Oak Orchard
- Oak Orchard Estates
- Oak Point
- Oak Ridge
- Oak Ridge Park
- Oakbrook
- Oakdale
- Oakes
- Oakfield
- Oakfield
- Oakland
- Oakland Gardens
- Oakland Ridge Mobile Home Park
- Oakland Valley
- Oaks Corners
- Oaksville
- Oakvale
- Oakville
- Oakwood
- Oakwood