- Oil & Gas Companies, Waterford
- Oil Burners Services, Waterford
- Oil Change & Lubrication, Waterford - Auto Oil & Quick Lube
- Oncologists, Waterford - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Waterford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Waterford
- Opticians, Waterford
- Optometrists, Waterford - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Waterford
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- Ornamental Nursery Services, Waterford
- Orthodontist, Waterford - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Waterford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Waterford
- Outdoor & Lawn & Garden Equipment Repair & Service, Waterford
- Outerwear Stores, Waterford - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Waterford - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Waterford - Oxygen Concentrator, Tank, Machine, etc
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