- Occupational Health Care Physicians & Surgeons, Wethersfield - Occupational Medicine
- Occupational Health Care Professionals, Wethersfield
- Occupational Medicine Doctors, Wethersfield - Physicians & Surgeons
- Occupational Therapy, Wethersfield - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Wethersfield
- Oil Burners Services, Wethersfield
- Oil Change & Lubrication, Wethersfield - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Wethersfield - Oil Companies
- Ophthalmologists, Wethersfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Wethersfield
- Opticians, Wethersfield
- Optometrists, Wethersfield - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Wethersfield
- Ornamental Nursery Products, Wethersfield
- Ornamental Nursery Services, Wethersfield
- Orthodontist, Wethersfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Wethersfield - Orthopedic Shoes
- Orthotics and Prosthetics, Wethersfield
- Other Building Materials & Supplies, Wethersfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Wethersfield
- Outdoor Equipment & Accessories, Wethersfield
- Outdoor Furniture, Wethersfield
- Outdoor Furniture & Patio Furniture, Wethersfield - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Wethersfield - Oxygen Concentrator, Tank, Machine, etc
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