- Owassa Estates Colonia
- Owassa-I Rd Colonia
- Owassa-Kennedy Colonia
- Owassa Rd-Tower Rd Colonia
- Oak Flat
- Oak Ridge
- Orton Hill
- Osceola
- Orient
- Odem Island
- O'Brien
- O'Donnell
- Oak Leaf
- Oak Point
- Oak Ridge North
- Oak Trail Shores
- Oklahoma Flat
- Odem
- Odessa
- Old River-Winfree
- Old Farm Crossing
- Olivarez
- Olmito
- Olmos Park
- Olton
- Onion Creek
- Opdyke West
- Oilla
- Orange Grove
- Ore City