- Obstetricians & Gynecologists, Astoria - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Astoria
- Occupational Therapy, Astoria - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Astoria
- Oil Change & Lubrication, Astoria - Auto Oil & Quick Lube
- Oil Field Supplies Rental, Astoria
- Oil Industry & Oil Field Equipment & Services, Astoria - Oil Companies
- Ophthalmologists, Astoria - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Astoria
- Opticians, Astoria
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- Optometrists, Astoria - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Astoria
- Ornamental Nursery Services, Astoria
- Orthodontist, Astoria - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Astoria
- Other Lodging, Astoria
- Outboard Motors Parts & Repair, Astoria
- Outdoor & Lawn & Garden Equipment Repair & Service, Astoria
- Outpatient Services, Astoria - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Astoria - Oxygen Concentrator, Tank, Machine, etc
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