- Obstetricians & Gynecologists, Jefferson - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Jefferson
- Oil Change & Lubrication, Jefferson - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Jefferson
- Opticians, Jefferson
- Optometrists, Jefferson - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Jefferson
- Ornamental Greenhouses, Jefferson
- Ornamental Nursery, Jefferson
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- Ornamental Nursery Products, Jefferson
- Ornamental Nursery Services, Jefferson
- Orthodontist, Jefferson - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Jefferson - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Jefferson
- Other Specialties, Jefferson - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Jefferson
- Outpatient Services, Jefferson - Outpatient Care
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