- Off Road Vehicles, Torrington
- Off Road Vehicles Parts & Accessories, Torrington
- Office Supplies, Equipment & Office Furniture Stores, Torrington
- Oil Change & Lubrication, Torrington - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Torrington - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Torrington
- Optometrists, Torrington - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Torrington - Eye Clinics
- Ornamental Greenhouses, Torrington
- Ornamental Nursery, Torrington
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- Ornamental Nursery Products, Torrington
- Ornamental Nursery Services, Torrington
- Orthopedists, Torrington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Torrington
- Other Building Materials & Supplies, Torrington
- Other Fuels, Torrington
- Other Lawyers & Attorneys, Torrington
- Outerwear Stores, Torrington - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Torrington - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Torrington - Oxygen Concentrator, Tank, Machine, etc
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