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- (Jackson County) Oak Island
- (Jackson County) Orchard
- (Navarro County) Oak Valley
- (Monroe County) Oglesby
- (Twiggs County) Oakwood
- (Stephens County) Oak Ridge
- (Stephens County) Oak Grove
- (Wayne County) O'Donnell
- (Morris County) Omaha
- (Covington County) Oyster Creek
- (Upshur County) Ore City
- (Geneva County) Olmito
- (Jackson County) Old River-Winfree
- (Schley County) Orange Grove
- (Union County) Oak Leaf
- (Polk County) Onalaska
- (Miller County) Oak Cliff Place
- (Travis County) Onion Creek
- (Toombs County) Olton
- (Cleburne County) Olmos Park
- (San Patricio County) Odem
- (Rusk County) Overton
- (Oglethorpe County) Oak Trail Shores
- (Montgomery County) Oak Ridge North
- (Young County) Olney
- Ozona
- (Talladega County) Oak Point
- (Muscogee County) Olivarez
- (Union County) Ovilla
- (Orange County) Orange