- Oak Grove
- Oakley
- Odenburg
- Oklahoma
- Oak Thicket Acres
- Oakland
- Old Castor
- Old Saline
- One North Place
- Oak Hurst Mobile Home Park
- Oakcreek Estates Mobile Home Park
- Orange Harbor Island
- Oak Grove
- Oak Island
- OK Landing
- Oaks
- Old Athens
- Omega
- Oak Hill
- Old Pleasant Hill
- O'Neal Place
- Oak Cluster
- Oak Glen Terrace Mobile Home Park
- Oak Hills
- Oak Shadows Place
- Oakbrook
- Oaknolia
- Olive Branch
- Oakley
- Oakley Landing