- Obstetricians & Gynecologists, Melville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Melville
- Occupational Therapy, Melville - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Melville
- Office Space on Rent, Melville - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Melville
- Oil & Petroleum Products, Melville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Melville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Melville - Oil Companies
- Oil Petroleum Wholesale, Melville
- Online Advertising, Melville - Internet Advertising
- Ophthalmic Goods, Melville
- Ophthalmologists, Melville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Melville
- Opticians, Melville
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- Optometrists, Melville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Melville - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Melville
- Orthodontist, Melville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Melville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Melville
- Other Attorneys & Lawyers, Melville
- Other Building Materials & Supplies, Melville
- Other Electrical Products, Melville
- Other Lawyers & Attorneys, Melville
- Other Lodging, Melville
- Outdoor Advertising & Billboard, Melville
- Outdoor Equipment & Accessories, Melville
- Outdoor Furniture & Patio Furniture, Melville - Garden Furniture Stores
- Outplacement Consultants, Melville
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