O
- Oak Corner
- Oak Crest
- Oakdale
- Oakgrove
- Oak Grove
- Oak Grove
- Oak Hill
- Oak Hill
- Oak Hollow
- Oakland
- Oakley
- Oakmont
- Oak Park
- Oaks Crossroads
- Oakway
- Oakwood
- Oakwood
- Oats
- Ocean Forest
- Oconee Point
- Ogden
- Okatie
- Olanta
- Olar
- Old Buckhead
- Old Joe
- Old Madison
- Old Morrisville
- Old Peru
- Old Town
- Oldwoods
- Olin
- Olympia
- O'Neal
- Ora
- Orangeburg
- Orange Grove
- Orchard Hill
- Orrs
- Osborn
- Oswald Park
- Oswego
- Outland
- Overbrook
- Owdoms
- Owens Crossroad
- Owings