- Obstetricians & Gynecologists, Waterbury - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Waterbury
- Occupational Health Care Professionals, Waterbury
- Occupational Therapy, Waterbury - Occupational Health Specialists
- Off Road Vehicles, Waterbury
- Off Road Vehicles Parts & Accessories, Waterbury
- Office Partitions & Dividers, Waterbury
- Office Supplies, Equipment & Office Furniture Stores, Waterbury
- Oil & Gas Companies, Waterbury
- Oil & Petroleum Products, Waterbury - Merchant, Wholesalers, etc
- Oil Burners Services, Waterbury
- Oil Change & Lubrication, Waterbury - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Waterbury - Oil Companies
- Oil Petroleum Wholesale, Waterbury
- Oil Refinery, Waterbury
- Oncologists, Waterbury - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Waterbury - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Waterbury
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Waterbury
- Opticians, Waterbury
- Optometrists, Waterbury - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Waterbury - Eye Clinics
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- Oral Surgeon, Waterbury - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Waterbury
- Ornamental Iron - Residential, Waterbury - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Waterbury - Steel, Iron, Bronze, etc
- Ornamental Nursery, Waterbury
- Ornamental Nursery Services, Waterbury
- Orthodontist, Waterbury - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Waterbury
- Orthodox Synagogues, Waterbury
- Orthopedic & Prosthetic Appliances & Shoes, Waterbury - Orthopedic Shoes
- Orthopedists, Waterbury - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Waterbury
- Other Lodging, Waterbury
- Outboard Motors, Waterbury
- Outdoor & Lawn & Garden Equipment Repair & Service, Waterbury
- Outdoor Adventures, Waterbury
- Outdoor Advertising & Billboard, Waterbury
- Outdoor Centers, Waterbury
- Outdoor Equipment & Accessories, Waterbury
- Outdoor Power Equipment Repair, Waterbury
- Outerwear Stores, Waterbury - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Waterbury - Outpatient Care
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