- Obstetricians & Gynecologists, Massapequa - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Massapequa
- Occupational Therapy, Massapequa - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Massapequa
- Oil & Gas Producers, Massapequa - Companies
- Oil Burners Services, Massapequa
- Online Advertising, Massapequa - Internet Advertising
- Ophthalmologists, Massapequa - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Massapequa
- Opticians, Massapequa
- Optometrists, Massapequa - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Massapequa - Dentists - Oral & Maxillofacial Surgeons
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- Orchestras, Symphonies & Bands, Massapequa
- Organizing Services & Products – Household & Business, Massapequa
- Ornamental Nursery, Massapequa
- Ornamental Nursery Services, Massapequa
- Orthodontist, Massapequa - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Massapequa - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Massapequa
- Other Attorneys & Lawyers, Massapequa
- Other Building Materials & Supplies, Massapequa
- Other Lawyers & Attorneys, Massapequa
- Outdoor & Lawn & Garden Equipment Repair & Service, Massapequa
- Outdoor Equipment & Accessories, Massapequa
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