- Obstetricians & Gynecologists, Southbury - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Southbury
- Occupational Therapy, Southbury - Occupational Health Specialists
- Off Road Vehicles, Southbury
- Off Road Vehicles Parts & Accessories, Southbury
- Office Supplies, Equipment & Office Furniture Stores, Southbury
- Oil Burners Services, Southbury
- Oil Change & Lubrication, Southbury - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Southbury - Oil Companies
- Ophthalmologists, Southbury - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Southbury
- Opticians, Southbury
- Optometrists, Southbury - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Southbury - Dentists - Oral & Maxillofacial Surgeons
- Oriental Restaurants, Southbury
- Ornamental Nursery, Southbury
- Ornamental Nursery Services, Southbury
- Orthodontist, Southbury - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Southbury
- Orthopedic & Prosthetic Appliances & Shoes, Southbury - Orthopedic Shoes
- Orthopedists, Southbury - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Southbury
- Outdoor Equipment & Accessories, Southbury
- Outdoor Furniture, Southbury
- Outdoor Furniture & Patio Furniture, Southbury - Garden Furniture Stores
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