- O'Donnell (Population: 1,011)
- Oak Leaf (Population: 1,209)
- Oak Point (Population: 1,747)
- Oak Ridge North (Population: 2,991)
- Oak Trail Shores (Population: 2,475)
- Odem (Population: 2,499)
- Odessa (Population: 90,943)
- Old River-Winfree (Population: 1,364)
- Olivarez (Population: 2,445)
- Olmito (Population: 1,198)
- Olmos Park (Population: 2,343)
- Olney (Population: 3,396)
- Olton (Population: 2,288)
- Onalaska (Population: 1,174)
- Onion Creek (Population: 2,116)
- Orange Grove (Population: 1,288)
- Orange (Population: 18,643)
- Ore City (Population: 1,106)
- Overton (Population: 2,350)
- Ovilla (Population: 3,405)
- Oyster Creek (Population: 1,192)
- Ozona (Population: 3,436)
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