- Obstetricians & Gynecologists, Mount Vernon - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Oil Change & Lubrication, Mount Vernon - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Mount Vernon - Oil Companies
- Oil Petroleum Wholesale, Mount Vernon
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Mount Vernon
- Optometrists, Mount Vernon - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Mount Vernon
- Ornamental Nursery Services, Mount Vernon
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