- Office of Vital Records
- Orchid farm
- Orphan asylum
- Olive oil manufacturer
- Outboard motor store
- Office of a fair trade organization
- Oilfield
- Oden restaurant
- Oxygen cocktail spot
- Okonomiyaki restaurant
- Opera house
- Offal pot cooking restaurant
- Outdoor equestrian facility
- Oyster supplier
- Open bread store
- Off track betting shop
- Outdoor activities
- Opera company
- Oldsmobile dealer
- Organ donation and tissue bank