- Office Supplies, Equipment & Office Furniture Stores, Upper Darby
- Oil Industry & Oil Field Equipment & Services, Upper Darby - Oil Companies
- Oil Petroleum Wholesale, Upper Darby
- Opera Companies, Upper Darby
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Upper Darby
- Opticians, Upper Darby
- Optometrists, Upper Darby - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Upper Darby
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