- Oatland Island
- Oberlochen
- Oberry
- Ocee
- Ochillee
- Ochwalkee
- Oconee Heights
- Oconee Springs
- Odessa
- Odessadale
- Odis Crossroads
- Ogeechee
- Ogeechee Farms
- Ogeecheeton
- Oglesby
- Oglethorpe Manor
- Oglethorpe Park
- Ohio
- Ohoopee
- Oklahoma Hills
- Ola
- Old Cedar Creek
- Old Chimney
- Old Church
- Old Clyattville
- Old Condor
- Old Damascus
- Old Davis Mill Estates
- Old Dellwood
- Old Ford Acres