- Oden Ridge
- Odena
- Odenville
- Odom Crossroads
- Ofelia
- Ogletree Island
- Ohatchee
- Ohio Island (historical)
- Okatuppa
- Old Atkinson Crossing
- Old Bethel
- Old Bingham
- Old Blevins Mill
- Old Bluffport
- Old Bratt Road Estates
- Old Burleson
- Old Charles Mobile Home Park
- Old Coloma
- Old Davisville
- Old Eastaboga
- Old Fabius
- Old Government Mobile Home Park
- Old Harmony
- Old Jonesboro
- Old Kingston
- Old Maylene
- Old Monrovia
- Old Nauvoo
- Old Providence
- Old Salem