- Obstetricians & Gynecologists, Salem - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Salem
- Occupational Therapy, Salem - Occupational Health Specialists
- Oceanographic Services, Salem
- Office Space on Rent, Salem - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Salem
- Oil & Gas Companies, Salem
- Oil Burners Services, Salem
- Oil Change & Lubrication, Salem - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Salem - Oil Companies
- Optical Goods Manufacturers, Salem
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Salem
- Opticians, Salem
- Optometrists, Salem - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Salem
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- Ornamental Nursery, Salem
- Ornamental Nursery Services, Salem
- Orthopedists, Salem - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Salem
- Other Building Materials & Supplies, Salem
- Other Industrial Contractors, Salem
- Other Lodging, Salem
- Outdoor & Lawn & Garden Equipment Repair & Service, Salem
- Outdoor Advertising & Billboard, Salem
- Outdoor Equipment & Accessories, Salem
- Outdoor Furniture, Salem
- Outdoor Furniture & Patio Furniture, Salem - Garden Furniture Stores
- Outerwear Stores, Salem - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Salem - Outpatient Care
- Outsourcing Services, Salem
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