- Office Supplies, Equipment & Office Furniture Stores, Roslyn Heights
- Oil & Petroleum Products, Roslyn Heights - Merchant, Wholesalers, etc
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Roslyn Heights
- Opticians, Roslyn Heights
- Optometrists, Roslyn Heights - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Roslyn Heights
- Organizing Services & Products – Household & Business, Roslyn Heights
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- Orthodontist, Roslyn Heights - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Roslyn Heights
- Orthodox Synagogues, Roslyn Heights
- Other Building Materials & Supplies, Roslyn Heights
- Outdoor Equipment & Accessories, Roslyn Heights
- Oxygen & Respiratory Equipment & Supplies, Roslyn Heights - Oxygen Concentrator, Tank, Machine, etc
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