- Obstetricians & Gynecologists, Sanford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Sanford
- Off Road Vehicles Parts & Accessories, Sanford
- Office Supplies, Equipment & Office Furniture Stores, Sanford
- Oil & Petroleum Products, Sanford - Merchant, Wholesalers, etc
- Oil Burners Services, Sanford
- Oncologists, Sanford - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Sanford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Sanford
- Opticians, Sanford
- Optometrists, Sanford - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Sanford
- Ornamental Nursery Services, Sanford
- Other Building Materials & Supplies, Sanford
- Outdoor & Lawn & Garden Equipment Repair & Service, Sanford
- Outdoor Equipment & Accessories, Sanford
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