- Office Supplies, Equipment & Office Furniture Stores, Leesburg
- Oil & Petroleum Products, Leesburg - Merchant, Wholesalers, etc
- Ophthalmologists, Leesburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Leesburg
- Optometrists, Leesburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Leesburg
- Organs Tuning & Repair, Leesburg
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