- Occupational Health & Safety, Newport
- Occupational Health Care Professionals, Newport
- Office Supplies, Equipment & Office Furniture Stores, Newport
- Oil & Gas Companies, Newport
- Oil & Petroleum Products, Newport - Merchant, Wholesalers, etc
- Oil Burners Services, Newport
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newport
- Optometrists, Newport - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Newport
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- Ornamental Nursery Services, Newport
- Orthodontist, Newport - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Newport
- Other Lodging, Newport
- Outdoor & Lawn & Garden Equipment Repair & Service, Newport
- Outdoor Equipment & Accessories, Newport
- Outerwear Stores, Newport - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Newport - Outpatient Care
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