- Obstetricians & Gynecologists, New Hyde Park - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, New Hyde Park
- Offset & Photolithographic Printing, New Hyde Park
- Oil & Gas Additives & Supplies, New Hyde Park
- Oil & Gas Companies, New Hyde Park
- Oil Burners Services, New Hyde Park
- Oil Change & Lubrication, New Hyde Park - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, New Hyde Park - Oil Companies
- Oil Petroleum Wholesale, New Hyde Park
- Oncologists, New Hyde Park - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, New Hyde Park - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, New Hyde Park
- Opticians, New Hyde Park
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- Optometrists, New Hyde Park - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, New Hyde Park - Dentists - Oral & Maxillofacial Surgeons
- Orthopedists, New Hyde Park - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, New Hyde Park
- Other Attorneys & Lawyers, New Hyde Park
- Other Attorneys & Lawyers, New Hyde Park
- Other Building Materials & Supplies, New Hyde Park
- Other Lawyers & Attorneys, New Hyde Park
- Outdoor & Lawn & Garden Equipment Repair & Service, New Hyde Park
- Outdoor Equipment & Accessories, New Hyde Park
- Outsourcing Services, New Hyde Park
- Oxygen & Respiratory Equipment & Supplies, New Hyde Park - Oxygen Concentrator, Tank, Machine, etc
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