- Obstetricians & Gynecologists, Barboursville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Barboursville
- Occupational Health Care Physicians & Surgeons, Barboursville - Occupational Medicine
- Occupational Health Care Professionals, Barboursville
- Occupational Medicine Doctors, Barboursville - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Barboursville
- Oil Change & Lubrication, Barboursville - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Barboursville
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- Opticians, Barboursville
- Optometrists, Barboursville - Eye Doctors, Physicians & Surgeons (Optometry)
- Organ Donation & Tissue Banks, Barboursville
- Other Building Materials & Supplies, Barboursville
- Outdoor Equipment & Accessories, Barboursville
- Outerwear Stores, Barboursville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Overhead Door, Barboursville
- Oxygen & Respiratory Equipment & Supplies, Barboursville - Oxygen Concentrator, Tank, Machine, etc
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