- Obstetricians & Gynecologists, Portsmouth - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Portsmouth
- Occupational Health Care Physicians & Surgeons, Portsmouth - Occupational Medicine
- Occupational Health Care Professionals, Portsmouth
- Office Supplies, Equipment & Office Furniture Stores, Portsmouth
- Oil Change & Lubrication, Portsmouth - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Portsmouth - Oil Companies
- Oil Petroleum Wholesale, Portsmouth
- Oncologists, Portsmouth - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Portsmouth
- Opticians, Portsmouth
- Optometrists, Portsmouth - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Portsmouth
- Ornamental Nursery Services, Portsmouth
- Orthopedic & Prosthetic Appliances & Shoes, Portsmouth - Orthopedic Shoes
- Orthopedists, Portsmouth - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Portsmouth
- Other Building Materials & Supplies, Portsmouth
- Other Specialties, Portsmouth - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Portsmouth
- Outdoor Equipment & Accessories, Portsmouth
- Ownership Organizations, Portsmouth
- Oxygen & Respiratory Equipment & Supplies, Portsmouth - Oxygen Concentrator, Tank, Machine, etc
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