- Obstetricians & Gynecologists, Patchogue - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Patchogue
- Off Road Vehicles Parts & Accessories, Patchogue
- Office Supplies, Equipment & Office Furniture Stores, Patchogue
- Oil Burners, Patchogue
- Oil Burners Services, Patchogue
- Oil Change & Lubrication, Patchogue - Auto Oil & Quick Lube
- Oils - Fuel - Alternative, Patchogue
- Ophthalmologists, Patchogue - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Patchogue
- Opticians, Patchogue
- Optometrists, Patchogue - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Patchogue - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Nursery, Patchogue
- Ornamental Nursery Services, Patchogue
- Orthopedists, Patchogue - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Patchogue
- Other Attorneys & Lawyers, Patchogue
- Other Attorneys & Lawyers, Patchogue
- Other Building Materials & Supplies, Patchogue
- Other Lawyers & Attorneys, Patchogue
- Outboard Motors, Patchogue
- Outboard Motors Parts & Repair, Patchogue
- Outdoor Equipment & Accessories, Patchogue
- Outdoor Furniture & Patio Furniture, Patchogue - Garden Furniture Stores
- Ownership Organizations, Patchogue
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