- Obstetricians & Gynecologists, Manhasset - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Manhasset
- Ophthalmologists, Manhasset - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Manhasset
- Opticians, Manhasset
- Optometrists, Manhasset - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Manhasset - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Manhasset
- Organ Donation & Tissue Banks, Manhasset
- Organizations Equipment & Supplies, Manhasset
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- Ornamental Nursery, Manhasset
- Ornamental Nursery Services, Manhasset
- Orthodontist, Manhasset - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Manhasset - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Manhasset
- Other Building Materials & Supplies, Manhasset
- Outdoor Equipment & Accessories, Manhasset
- Outdoor Furniture, Manhasset
- Outsourcing Services, Manhasset
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