- Occupational Health Care Physicians & Surgeons, Newport - Occupational Medicine
- Occupational Health Care Professionals, Newport
- Off Road Vehicles, Newport
- Off Road Vehicles Parts & Accessories, Newport
- Office Machinery, Newport
- Office Supplies, Equipment & Office Furniture Stores, Newport
- Oil & Gas Companies, Newport
- Oil Change & Lubrication, Newport - Auto Oil & Quick Lube
- Ophthalmologists, Newport - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Newport - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newport
- Opticians, Newport
- Optometrists, Newport - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Newport - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Newport
- Ornamental Nursery Products, Newport
- Ornamental Nursery Services, Newport
- Orthodontist, Newport - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Newport - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Newport
- Other Lodging, Newport
- Other Specialties, Newport - Doctors, Physicians & Surgeons
- Outdoor Equipment & Accessories, Newport
- Outerwear Stores, Newport - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Newport - Outpatient Care
- Overhead Door, Newport
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