- Obstetricians & Gynecologists, Watertown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Watertown
- Off Road Vehicles Parts & Accessories, Watertown
- Oil Change & Lubrication, Watertown - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Watertown
- Opticians, Watertown
- Optometrists, Watertown - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Watertown - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Watertown
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- Ornamental Greenhouses, Watertown
- Ornamental Nursery, Watertown
- Ornamental Nursery Services, Watertown
- Orthodontist, Watertown - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Watertown
- Other Electrical Products, Watertown
- Outdoor & Lawn & Garden Equipment Repair & Service, Watertown
- Outdoor Equipment & Accessories, Watertown
- Outpatient Services, Watertown - Outpatient Care
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