- Obstetricians & Gynecologists, Watertown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Watertown
- Occupational Health Care Professionals, Watertown
- Office Buildings & Parks, Watertown
- Office Supplies, Equipment & Office Furniture Stores, Watertown
- Oil Change & Lubrication, Watertown - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Watertown - Oil Companies
- Oils & Greases, Watertown
- Ophthalmologists, Watertown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Watertown
- Opticians, Watertown
- Optometrists, Watertown - Eye Doctors, Physicians & Surgeons (Optometry)
- Organ Donation & Tissue Banks, Watertown
- Oriental Goods & Products Stores, Watertown
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- Ornamental Nursery, Watertown
- Ornamental Nursery Services, Watertown
- Orthodontist, Watertown - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Watertown - Orthopedic Shoes
- Orthopedists, Watertown - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Watertown
- Other Building Materials & Supplies, Watertown
- Other Lodging, Watertown
- Outdoor Equipment & Accessories, Watertown
- Outdoor Furniture & Patio Furniture, Watertown - Garden Furniture Stores
- Outerwear Stores, Watertown - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outsourcing Services, Watertown
- Oxygen & Respiratory Equipment & Supplies, Watertown - Oxygen Concentrator, Tank, Machine, etc
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