- Oneida Subdivision
- Otter Creek Junction
- Oak Hill Estates
- Oglesby
- Old Hickory
- Oak Grove
- Oak Grove
- Oak Park
- Old Salem
- Oneida
- Oak Grove
- Oak Hill
- Oakdale
- Oakland
- Oak Grove
- Odd Fellows Hall
- Olivet
- Oakland
- Oak Hills
- Ottway
- Oak Grove
- Oak Hill North
- Old Farm
- Olde Mill
- Opossum Creek Pines
- Orchard Knob
- Oak City
- Oldham
- Oak Grove
- Oak Grove