- Office Supplies, Equipment & Office Furniture Stores, Amityville
- Oil & Gas Companies, Amityville
- Oil Brokers, Amityville
- Oil Burners Services, Amityville
- Oil Industry & Oil Field Equipment & Services, Amityville - Oil Companies
- Oil Petroleum Wholesale, Amityville
- Ophthalmologists, Amityville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Amityville
- Opticians, Amityville
- Optometrists, Amityville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Amityville - Eye Clinics
- Orchestras, Symphonies & Bands, Amityville
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- Organizing Services & Products – Household & Business, Amityville
- Ornamental Nursery, Amityville
- Ornamental Nursery Services, Amityville
- Orthopedists, Amityville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Amityville - Physicians & Surgeons
- Other Building Materials & Supplies, Amityville
- Outboard Motors, Amityville
- Outdoor & Lawn & Garden Equipment Repair & Service, Amityville
- Outdoor Equipment & Accessories, Amityville
- Outdoor Furniture & Patio Furniture, Amityville - Garden Furniture Stores
- Ownership Organizations, Amityville
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