- Off Road Vehicles, Plattsburgh
- Off Road Vehicles Parts & Accessories, Plattsburgh
- Office Buildings & Parks, Plattsburgh
- Office Equipment & Supplies Manufacturers, Plattsburgh
- Office Machinery, Plattsburgh
- Office Supplies, Equipment & Office Furniture Stores, Plattsburgh
- Oil & Gas Companies, Plattsburgh
- Oil & Petroleum Products, Plattsburgh - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Plattsburgh - Auto Oil & Quick Lube
- Ophthalmologists, Plattsburgh - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Plattsburgh
- Opticians, Plattsburgh
- Optometrists, Plattsburgh - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Plattsburgh
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- Ornamental Greenhouses, Plattsburgh
- Ornamental Nursery, Plattsburgh
- Ornamental Nursery Services, Plattsburgh
- Orthodontist, Plattsburgh - Teeth Straightening, Invisalign & Dental Braces
- Orthotics and Prosthetics, Plattsburgh
- Other Building Materials & Supplies, Plattsburgh
- Other Industrial Contractors, Plattsburgh
- Other Lodging, Plattsburgh
- Outdoor & Lawn & Garden Equipment Repair & Service, Plattsburgh
- Outdoor Equipment & Accessories, Plattsburgh
- Outdoor Furniture & Patio Furniture, Plattsburgh - Garden Furniture Stores
- Outerwear Stores, Plattsburgh - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Oxygen & Respiratory Equipment & Supplies, Plattsburgh - Oxygen Concentrator, Tank, Machine, etc
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