- Occupational Health Care Professionals, Newport
- Occupational Rehabilitation, Newport
- Office Supplies, Equipment & Office Furniture Stores, Newport
- Oil & Gas Companies, Newport
- Oil Industry & Oil Field Equipment & Services, Newport - Oil Companies
- Oil Petroleum Wholesale, Newport
- Oncologists, Newport - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Newport - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newport
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- Optometrists, Newport - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Newport
- Ornamental Nursery, Newport
- Ornamental Nursery Services, Newport
- Other Building Materials & Supplies, Newport
- Outdoor & Lawn & Garden Equipment Repair & Service, Newport
- Outpatient Services, Newport - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Newport - Oxygen Concentrator, Tank, Machine, etc
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