- Orion
- Overbrook
- Oak Grove
- Old Kingston
- Oak
- Old Charles Mobile Home Park
- Oleander Court Mobile Home Park
- Ono Island
- Orchards Mobile Home Park
- Oyster Bay
- Oateston
- Osco
- Oakley
- Old Snead
- Oak Level
- Old Davisville
- Ottery
- Oxanna
- Omega
- Ox Level
- Oaky Streak
- Odom Crossroads
- Oak Bowery
- Oakland
- Old Atkinson Crossing
- Osanippa
- Oceola
- Old Coloma
- Oak Grove
- Ocampo