- Obstetricians & Gynecologists, Salem - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Salem
- Off Road Vehicles Parts & Accessories, Salem
- Office Buildings & Parks, Salem
- Oil Change & Lubrication, Salem - Auto Oil & Quick Lube
- Oncologists, Salem - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Salem - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Salem
- Opticians, Salem
- Optometrists, Salem - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Salem - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Salem
- Ornamental Nursery Services, Salem
- Other Attorneys & Lawyers, Salem
- Other Attorneys & Lawyers, Salem
- Other Lawyers & Attorneys, Salem
- Outdoor & Lawn & Garden Equipment Repair & Service, Salem
- Outdoor Equipment & Accessories, Salem
- Oxygen & Respiratory Equipment & Supplies, Salem - Oxygen Concentrator, Tank, Machine, etc
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