- Obstetricians & Gynecologists, North Tonawanda - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, North Tonawanda
- Oil & Gas Companies, North Tonawanda
- Oil Change & Lubrication, North Tonawanda - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, North Tonawanda - Oil Companies
- Oil Refinery, North Tonawanda
- Oils Cutting, North Tonawanda
- Ophthalmologists, North Tonawanda - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, North Tonawanda
- Opticians, North Tonawanda
- Optometrists, North Tonawanda - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, North Tonawanda
- Ornamental Nursery Services, North Tonawanda
- Orthodox Churches, North Tonawanda
- Other Attorneys & Lawyers, North Tonawanda
- Other Attorneys & Lawyers, North Tonawanda
- Other Building Materials & Supplies, North Tonawanda
- Other Lawyers & Attorneys, North Tonawanda
- Outboard Motors, North Tonawanda
- Outdoor & Lawn & Garden Equipment Repair & Service, North Tonawanda
- Outdoor Equipment & Accessories, North Tonawanda
- Oxygen & Respiratory Equipment & Supplies, North Tonawanda - Oxygen Concentrator, Tank, Machine, etc
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