- Occupational Health Care Professionals, Astoria
- Occupational Therapy, Astoria - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Astoria
- Oils Recycling, Astoria
- Online Advertising, Astoria - Internet Advertising
- Opera Companies, Astoria
- Ophthalmic Goods, Astoria
- Ophthalmologists, Astoria - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Instruments & Lenses Manufacturers, Astoria
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Astoria
- Opticians, Astoria
- Optometrists, Astoria - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Astoria
- Ornamental Nursery, Astoria
- Ornamental Nursery Services, Astoria
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- Orthodontist, Astoria - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Astoria
- Orthopedic & Prosthetic Appliances & Shoes, Astoria - Orthopedic Shoes
- Orthopedists, Astoria - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Astoria
- Other Attorneys & Lawyers, Astoria
- Other Attorneys & Lawyers, Astoria
- Other Building Materials & Supplies, Astoria
- Other Electrical Products, Astoria
- Other Lawyers & Attorneys, Astoria
- Otolaryngologists, Astoria - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor Advertising & Billboard, Astoria
- Outdoor Equipment & Accessories, Astoria
- Outpatient Services, Astoria - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Astoria - Oxygen Concentrator, Tank, Machine, etc
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