- Odulund Island
- Old Town Hammock
- Oak Harbor
- Oak Hill
- Oak Hill Park
- Oak Landing
- Oak Ridge Mobile Home Village
- Oakhurst
- Oaks Mobile Home Court
- Oaks of Atlantic Beach Mobile Home Park
- Oakwood Villa
- Oceanway Village Mobile Home Park
- Orange Park North Mobile Home Community
- Ortega
- Ortega Farms
- Ortega Forest
- Ortega Terrace
- Ortega Village Manufactured Home Community
- Otis
- Olive
- Oyster Lodge
- Old Dinner Island
- Oak Grove
- Observation Island
- Ortona
- Oak Grove
- Odena
- Overstreet
- Octahatchee
- Oak Creek Islands