- Office Supplies, Equipment & Office Furniture Stores, Copiague
- Offset & Photolithographic Printing, Copiague
- Oil Change & Lubrication, Copiague - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Copiague
- Optometrists, Copiague - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Copiague
- Ornamental Nursery Services, Copiague
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