- Ogden
- O'Donnell
- O'Hara Township
- Oak Forest
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove Trailer Park
- Oak Hall
- Oak Hill
- Oak Hill
- Oak Hill
- Oak Hill
- Oak Hill
- Oak Hills
- Oak Lane
- Oak Lane
- Oak Lane Manor
- Oak Manor
- Oak Park
- Oak Park
- Oak Ridge
- Oak Ridge
- Oak Shade
- Oak Summit
- Oak Tree
- Oak Wood East