- Obstetricians & Gynecologists, Glens Falls - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Glens Falls
- Occupational Rehabilitation, Glens Falls
- Occupational Therapy, Glens Falls - Occupational Health Specialists
- Off Road Vehicles, Glens Falls
- Off Road Vehicles Parts & Accessories, Glens Falls
- Office Buildings & Parks, Glens Falls
- Office Supplies, Equipment & Office Furniture Stores, Glens Falls
- Oncologists, Glens Falls - Cancer Doctors, Physicians & Surgeons (Oncology)
- Opera Companies, Glens Falls
- Ophthalmologists, Glens Falls - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Glens Falls
- Opticians, Glens Falls
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- Optometrists, Glens Falls - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Glens Falls - Eye Clinics
- Ornamental Nursery, Glens Falls
- Ornamental Nursery Services, Glens Falls
- Other Attorneys & Lawyers, Glens Falls
- Other Building Materials & Supplies, Glens Falls
- Other Electrical Products, Glens Falls
- Other Lodging, Glens Falls
- Outdoor & Lawn & Garden Equipment Repair & Service, Glens Falls
- Outdoor Equipment & Accessories, Glens Falls
- Outpatient Clinics, Glens Falls - Care & Treatment Centers
- Oxygen & Respiratory Equipment & Supplies, Glens Falls - Oxygen Concentrator, Tank, Machine, etc
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