- Occupational Health Care Professionals, North Kingstown
- Occupational Therapy, North Kingstown - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, North Kingstown
- Oil Burners Services, North Kingstown
- Ophthalmic Goods, North Kingstown
- Ophthalmic Instruments & Machinery, North Kingstown
- Ophthalmologists, North Kingstown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, North Kingstown
- Optometrists, North Kingstown - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, North Kingstown
- Ornamental Nursery, North Kingstown
- Ornamental Nursery Services, North Kingstown
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- Orthodontist, North Kingstown - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, North Kingstown - Orthopedic Shoes
- Orthopedic Shoes, North Kingstown
- Orthotics and Prosthetics, North Kingstown
- Other Attorneys & Lawyers, North Kingstown
- Other Attorneys & Lawyers, North Kingstown
- Other Building Materials & Supplies, North Kingstown
- Other Lawyers & Attorneys, North Kingstown
- Outdoor & Lawn & Garden Equipment Repair & Service, North Kingstown
- Outdoor Equipment & Accessories, North Kingstown
- Outpatient Clinics, North Kingstown - Care & Treatment Centers
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