- Obstetricians & Gynecologists, Salem - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Salem
- Occupational Therapy, Salem - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Salem
- Oil & Petroleum Products, Salem - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Salem - Auto Oil & Quick Lube
- Old Age Homes Service, Salem
- Oncologists, Salem - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmic Goods, Salem
- Ophthalmic Instruments & Machinery, Salem
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Salem
- Opticians, Salem
- Optometrists, Salem - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Salem - Dentists - Oral & Maxillofacial Surgeons
- Orthodontist, Salem - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Salem
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- Orthopedic & Prosthetic Appliances & Shoes, Salem - Orthopedic Shoes
- Orthopedists, Salem - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Salem
- Other Attorneys & Lawyers, Salem
- Other Attorneys & Lawyers, Salem
- Other Building Materials & Supplies, Salem
- Other Lawyers & Attorneys, Salem
- Other Lodging, Salem
- Outdoor & Lawn & Garden Equipment Repair & Service, Salem
- Outdoor Centers, Salem
- Outdoor Equipment & Accessories, Salem
- Outdoor Furniture & Patio Furniture, Salem - Garden Furniture Stores
- Outdoor Man Made & Natural Recreation Facilities, Salem
- Outdoor Power Equipment, Salem
- Oxygen & Respiratory Equipment & Supplies, Salem - Oxygen Concentrator, Tank, Machine, etc
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