- Obstetricians & Gynecologists, Gloversville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Gloversville
- Occupational Health Care Physicians & Surgeons, Gloversville - Occupational Medicine
- Occupational Health Care Professionals, Gloversville
- Office Supplies, Equipment & Office Furniture Stores, Gloversville
- Oil Change & Lubrication, Gloversville - Auto Oil & Quick Lube
- Oilfield Trucking, Gloversville
- Ophthalmologists, Gloversville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Gloversville
- Opticians, Gloversville
- Optometrists, Gloversville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Gloversville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Gloversville
- Ornamental Nursery Services, Gloversville
- Orthodontist, Gloversville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Gloversville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Gloversville
- Outdoor & Lawn & Garden Equipment Repair & Service, Gloversville
- Outdoor Equipment & Accessories, Gloversville
- Outpatient Services, Gloversville - Outpatient Care
- Outsourcing Services, Gloversville
- Oxygen & Respiratory Equipment & Supplies, Gloversville - Oxygen Concentrator, Tank, Machine, etc
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