- Obstetricians & Gynecologists, Columbia City - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Columbia City
- Occupational Health Care Physicians & Surgeons, Columbia City - Occupational Medicine
- Occupational Health Care Professionals, Columbia City
- Office Supplies, Equipment & Office Furniture Stores, Columbia City
- Oil Change & Lubrication, Columbia City - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Columbia City
- Optometrists, Columbia City - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Columbia City - Dentists - Oral & Maxillofacial Surgeons
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