- Obstetricians & Gynecologists, West Hempstead - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Partitions & Dividers, West Hempstead
- Office Supplies, Equipment & Office Furniture Stores, West Hempstead
- Oil & Petroleum Products, West Hempstead - Merchant, Wholesalers, etc
- Oil Burners Services, West Hempstead
- Oil Change & Lubrication, West Hempstead - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, West Hempstead
- Opticians, West Hempstead
- Optometrists, West Hempstead - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, West Hempstead - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, West Hempstead
- Organizations Equipment & Supplies, West Hempstead
- Orthodontist, West Hempstead - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, West Hempstead - Orthopedic Shoes
- Orthotics and Prosthetics, West Hempstead
- Other Building Materials & Supplies, West Hempstead
- Outdoor & Lawn & Garden Equipment Repair & Service, West Hempstead
- Outdoor Equipment & Accessories, West Hempstead
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