- O'Connor Drive
- O'Kill Street
- Oak Street
- Oakridge Avenue
- Oakview Avenue
- Oakwood Crescent
- Old Colony Road
- Old Front Road
- Old Kingston Mills Road
- Old Mill Road
- Old Oak Road
- Old Quarry Road
- Olive Crescent
- Olympus Avenue
- Ontario Street
- Orchard Street
- Ordnance Street
- Oriole Lane
- Ortona Point
- Ottawa Street
- Overlea Court
- Owens Crescent