- Obstetricians & Gynecologists, Amherst - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Amherst
- Occupational Therapy, Amherst - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Amherst
- Office Furniture & Equipment Rental & Leasing, Amherst
- Office Supplies, Equipment & Office Furniture Stores, Amherst
- Oil & Petroleum Products, Amherst - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Amherst - Auto Oil & Quick Lube
- Oncologists, Amherst - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Amherst - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Amherst
- Opticians, Amherst
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- Optometrists, Amherst - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Amherst
- Organizing Services & Products – Household & Business, Amherst
- Ornamental Nursery, Amherst
- Ornamental Nursery Services, Amherst
- Orthopedic Shoes, Amherst
- Orthopedists, Amherst - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Amherst
- Other Office Supply Stores, Amherst
- Outdoor & Lawn & Garden Equipment Repair & Service, Amherst
- Outdoor Equipment & Accessories, Amherst
- Oxygen & Respiratory Equipment & Supplies, Amherst - Oxygen Concentrator, Tank, Machine, etc
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