- Oakville
- O'Neal
- Oak Grove
- Oakdale
- Oakdale Acres
- Oakland
- Oakland
- Orrville
- Oak Grove
- Oak Park
- Oakwood
- Old Monrovia
- Octagon
- Old Spring Hill
- Oak Grove
- Oleander
- Oak Grove
- Oakway Trailer Park
- Old Government Mobile Home Park
- Orchard
- Old Salem
- Old Texas
- Ollie
- Oak Ridge
- Oakworth
- Oden Ridge
- Oakman
- Odenville
- Ohatchee
- Onycha