- Obstetricians & Gynecologists, Salem - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Salem
- Oil & Gas Companies, Salem
- Oil Burners Services, Salem
- Oil Change & Lubrication, Salem - Auto Oil & Quick Lube
- Ophthalmologists, Salem - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Salem
- Opticians, Salem
- Optometrists, Salem - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Salem - Eye Clinics
- Oral Surgeon, Salem - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Salem
- Ornamental Nursery Services, Salem
- Orthodox Churches, Salem
- Orthopedic & Prosthetic Appliances & Shoes, Salem - Orthopedic Shoes
- Orthopedists, Salem - Orthopedic Surgery Doctors, Physicians & Surgeons
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- Orthotics and Prosthetics, Salem
- Other Attorneys & Lawyers, Salem
- Other Attorneys & Lawyers, Salem
- Other Building Materials & Supplies, Salem
- Other Lawyers & Attorneys, Salem
- Other Office Supply Stores, Salem
- Otolaryngologists, Salem - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outboard Motors, Salem
- Outboard Motors Parts & Repair, Salem
- Outdoor & Lawn & Garden Equipment Repair & Service, Salem
- Outdoor Equipment & Accessories, Salem
- Outerwear & Accessories Manufacturers, Salem
- Outpatient Services, Salem - Outpatient Care
- Outplacement Consultants, Salem
- Ownership Organizations, Salem
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