- Oakview
- Offenbacher Mobile Home Park
- Oakwood Mobile Home Park
- Ollins Corners
- Oakdale
- Olbers
- Oco
- Olivett
- Orchard Acres
- Oneida
- Oakgrove
- Oakland
- Ogden
- Orange
- Olentangy
- Olentangy Estates
- Ohio Shores
- Olmsted
- Olmsted Trailer Park
- Orange Center
- Olwine Mobile Home Park
- Otterbein
- Oakdale
- Oldfield Estates
- Olentangy Crossings
- Olentangy Falls
- Olive Green
- Orange
- Oberlin Beach
- Ogontz