- Opel dealer
- Off roading area
- Off track betting shop
- Oil & natural gas company
- Oilfield
- Orchard
- Oil field equipment supplier
- Office supply wholesaler
- Opera house
- Orthodox church
- Oil wholesaler
- Office services
- Ophthalmology clinic
- Opera company
- Oxygen equipment supplier
- Office of a fair trade organization
- Orchestra
- Outdoor movie theater
- Orthodox synagogue
- Off-road race track