- Oak Grove
- Oak Hill
- Oakwood
- Oakdale
- Oakwood Estates
- Oak Corner
- Oak Hill
- Oak Park
- Oakatee
- Old Cordesville
- Old Joe
- Old Peru
- Owens Crossroad
- Oak Island
- Oak Island
- Oakmont
- Oakwood Park
- Oceanmarsh Subdivision
- Old Combahee Island
- Old Island
- Opossum Point Landing
- Orange Grove
- Otter Hole
- Oak Island
- Oakcrest
- Oakgrove
- Oakland
- Oakview Park
- Oceanview
- Old Orchard