- Obstetricians & Gynecologists, Long Island City - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Long Island City
- Occupational Therapy, Long Island City - Occupational Health Specialists
- Office Partitions & Dividers, Long Island City
- Office Supplies, Equipment & Office Furniture Stores, Long Island City
- Oil & Gas Additives & Supplies, Long Island City
- Oil & Petroleum Products, Long Island City - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Long Island City - Auto Oil & Quick Lube
- Optical Goods Manufacturers, Long Island City
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Long Island City
- Opticians, Long Island City
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- Orchestras, Symphonies & Bands, Long Island City
- Organizing Services & Products – Household & Business, Long Island City
- Orthotics and Prosthetics, Long Island City
- Other Building Materials & Supplies, Long Island City
- Other Electrical Products, Long Island City
- Outdoor Advertising & Billboard, Long Island City
- Outdoor Equipment & Accessories, Long Island City
- Outerwear & Accessories Manufacturers, Long Island City
- Outerwear Stores, Long Island City - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Long Island City - Outpatient Care
- Ownership Organizations, Long Island City
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