- Obstetricians & Gynecologists, Franklin - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Franklin - Occupational Medicine
- Occupational Health Care Professionals, Franklin
- Occupational Medicine Doctors, Franklin - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Franklin
- Ophthalmologists, Franklin - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Franklin
- Opticians, Franklin
- Optometrists, Franklin - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Greenhouses, Franklin
- Ornamental Nursery, Franklin
- Ornamental Nursery Services, Franklin
- Orthodontist, Franklin - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Franklin - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Franklin
- Outdoor Equipment & Accessories, Franklin
- Outpatient Services, Franklin - Outpatient Care
- Ownership Organizations, Franklin
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