- Obstetricians & Gynecologists, Schenectady - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Schenectady
- Occupational Therapy, Schenectady - Occupational Health Specialists
- Off Road Vehicles, Schenectady
- Off Road Vehicles Parts & Accessories, Schenectady
- Off Track Betting, Schenectady
- Office Buildings & Parks, Schenectady
- Office Supplies, Equipment & Office Furniture Stores, Schenectady
- Oil & Gas Companies, Schenectady
- Oil & Petroleum Products, Schenectady - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Schenectady - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Schenectady - Oil Companies
- Oil Petroleum Wholesale, Schenectady
- Opera Companies, Schenectady
- Ophthalmologists, Schenectady - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Schenectady
- Opticians, Schenectady
- Optometrists, Schenectady - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Schenectady - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Schenectady
- Organizing Services & Products – Household & Business, Schenectady
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- Oriental Restaurants, Schenectady
- Ornamental Greenhouses, Schenectady
- Ornamental Nursery, Schenectady
- Ornamental Nursery Services, Schenectady
- Orthodontist, Schenectady - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Schenectady
- Orthopedic & Prosthetic Appliances & Shoes, Schenectady - Orthopedic Shoes
- Orthopedists, Schenectady - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Schenectady
- Other Attorneys & Lawyers, Schenectady
- Other Attorneys & Lawyers, Schenectady
- Other Building Materials & Supplies, Schenectady
- Other Electrical Products, Schenectady
- Other Lawyers & Attorneys, Schenectady
- Other Lodging, Schenectady
- Outdoor & Lawn & Garden Equipment Repair & Service, Schenectady
- Outdoor Equipment & Accessories, Schenectady
- Outdoor Furniture & Patio Furniture, Schenectady - Garden Furniture Stores
- Outpatient Clinics, Schenectady - Care & Treatment Centers
- Oxygen & Respiratory Equipment & Supplies, Schenectady - Oxygen Concentrator, Tank, Machine, etc
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