- Occupational Health & Safety, Torrington
- Occupational Health Care Physicians & Surgeons, Torrington - Occupational Medicine
- Occupational Health Care Professionals, Torrington
- Office Supplies, Equipment & Office Furniture Stores, Torrington
- Oil & Gas Additives & Supplies, Torrington
- Oil & Gas Companies, Torrington
- Oil & Gas Exploration & Development, Torrington - Oil Field Exploration, Monitoring & Remediation
- Oil Burners Services, Torrington
- Oil Change & Lubrication, Torrington - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Torrington - Oil Companies
- Old Age Homes Service, Torrington
- Oncologists, Torrington - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Torrington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Torrington
- Opticians, Torrington
|
- Optometrists, Torrington - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Torrington - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Torrington
- Ornamental Nursery Services, Torrington
- Orthodontist, Torrington - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Torrington - Orthopedic Shoes
- Orthopedists, Torrington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Torrington
- Other Industrial Contractors, Torrington
- Other Lodging, Torrington
- Outdoor Equipment & Accessories, Torrington
- Outdoor Furniture & Patio Furniture, Torrington - Garden Furniture Stores
- Outpatient Services, Torrington - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Torrington - Oxygen Concentrator, Tank, Machine, etc
|
