- Office Supplies, Equipment & Office Furniture Stores, Queensbury
- Oil Change & Lubrication, Queensbury - Auto Oil & Quick Lube
- Old Age Homes Service, Queensbury
- Ophthalmologists, Queensbury - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Queensbury
- Opticians, Queensbury
- Optometrists, Queensbury - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Queensbury - Eye Clinics
- Oral Surgeon, Queensbury - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Nursery, Queensbury
- Ornamental Nursery Services, Queensbury
- Orthopedists, Queensbury - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Queensbury
- Other Lodging, Queensbury
- Outdoor & Lawn & Garden Equipment Repair & Service, Queensbury
- Outdoor Equipment & Accessories, Queensbury
- Outdoor Furniture & Patio Furniture, Queensbury - Garden Furniture Stores
- Outpatient Services, Queensbury - Outpatient Care
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