- Olympus Acres
- Omar
- Onstott Acres
- Oran
- Orange Blossom Creek
- Orange Court
- Orange Crest
- Orange Grove Park
- Orange Haven
- Orange Heights
- Orange Heights West
- Orange Hill Heights West
- Orange River Estates
- Orange Villa
- Orange Wood Estates
- Orange Wood Park
- Orangedale Park
- Orangeland
- Orangewood
- Orangewood Estates
- Orangewood Manor
- Orchid Grove
- Orendain
- Orens Acres
- Orient Park
- Oriole
- Ortega Park
- Osborne Oaks
- Osborne Woods
- Oscawana