- Others
- Outlet mall
- Outdoor movie theater
- Orthopedic clinic
- Orthopedic surgeon
- Orphanage
- Outlet store
- Optometrist
- Oral surgeon
- Office supply store
- Oil change service
- Organic food store
- Orthodontist
- Oncologist
- Oil & natural gas company
- Oil refinery
- Office
- Orthotics & prosthetics service
- Oral and maxillofacial surgeon
- Obstetrician-gynecologist