- Office Buildings & Parks, Cranston
- Office Supplies, Equipment & Office Furniture Stores, Cranston
- Oil Burners Services, Cranston
- Oil Change & Lubrication, Cranston - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Cranston - Oil Companies
- Oils & Greases, Cranston
- Oils Fuel Treatment Compounds, Cranston
- Oncologists, Cranston - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Cranston - Internet Advertising
- Ophthalmologists, Cranston - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Cranston
- Opticians, Cranston
- Optometrists, Cranston - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Cranston - Dentists - Oral & Maxillofacial Surgeons
- Organs Tuning & Repair, Cranston
- Oriental Restaurants, Cranston
- Ornamental Greenhouses, Cranston
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- Ornamental Metal Work, Cranston - Steel, Iron, Bronze, etc
- Ornamental Nursery, Cranston
- Ornamental Nursery Services, Cranston
- Orthodontist, Cranston - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Cranston - Orthopedic Shoes
- Orthopedists, Cranston - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Cranston
- Other Building Materials & Supplies, Cranston
- Other Electrical Products, Cranston
- Other Lodging, Cranston
- Outdoor & Lawn & Garden Equipment Repair & Service, Cranston
- Outdoor Centers, Cranston
- Outdoor Equipment & Accessories, Cranston
- Outdoor Furniture & Patio Furniture, Cranston - Garden Furniture Stores
- Outdoor Power Equipment, Cranston
- Outpatient Services, Cranston - Outpatient Care
- Overhead Door, Cranston
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