- Oberry
- Odis Crossroads
- O'Reily Estates
- Oaklawn
- Old Rock Hill
- Oak Level
- Oakcrest
- Olney
- Overbrook
- Old Church
- Old Sardis
- Oak Hill
- Oakwood Homes Mobile Home Park
- Olifftown
- Oak Grove
- Oak Mountain
- Old Villa Rica
- Old Fort Estates
- Old Mill Trace
- O'Leary
- Oakhurst
- Oatland Island
- Ogeechee Farms
- Ogeecheeton
- Onslow Island
- Ossabaw Island
- Ottawa Estates
- Ochillee
- Oak Park
- Oakwood