- Office Planning & Design, Ogdensburg
- Office Supplies, Equipment & Office Furniture Stores, Ogdensburg
- Oil Change & Lubrication, Ogdensburg - Auto Oil & Quick Lube
- Oncologists, Ogdensburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Ogdensburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Ogdensburg - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ogdensburg
- Opticians, Ogdensburg
- Optometrists, Ogdensburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Ogdensburg - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Ogdensburg
- Ornamental Nursery Services, Ogdensburg
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- Orthopedic & Prosthetic Appliances & Shoes, Ogdensburg - Orthopedic Shoes
- Orthopedists, Ogdensburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Ogdensburg
- Other Attorneys & Lawyers, Ogdensburg
- Other Building Materials & Supplies, Ogdensburg
- Other Lawyers & Attorneys, Ogdensburg
- Other Lodging, Ogdensburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Ogdensburg
- Outdoor Centers, Ogdensburg
- Outdoor Power Equipment, Ogdensburg
- Outpatient Clinics, Ogdensburg - Care & Treatment Centers
- Oxygen & Respiratory Equipment & Supplies, Ogdensburg - Oxygen Concentrator, Tank, Machine, etc
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