- Office Supplies, Equipment & Office Furniture Stores, Boonton
- Oil Industry & Oil Field Equipment & Services, Boonton - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Boonton
- Opticians, Boonton
- Optometrists, Boonton - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Boonton
- Ornamental Greenhouses, Boonton
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