- Obstetricians, Kernersville - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Kernersville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Kernersville - Occupational Medicine
- Occupational Health Care Professionals, Kernersville
- Office Machinery, Kernersville
- Office Supplies, Equipment & Office Furniture Stores, Kernersville
- Oil & Gas Companies, Kernersville
- Oil Change & Lubrication, Kernersville - Auto Oil & Quick Lube
- Oncologists, Kernersville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Kernersville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Kernersville
- Optometrists, Kernersville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Kernersville - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Nursery, Kernersville
- Ornamental Nursery Products, Kernersville
- Ornamental Nursery Services, Kernersville
- Orthodontist, Kernersville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Kernersville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Kernersville
- Other Attorneys & Lawyers, Kernersville
- Other Building Materials & Supplies, Kernersville
- Other Electrical Products, Kernersville
- Other Lawyers & Attorneys, Kernersville
- Other Lodging, Kernersville
- Outdoor Advertising & Billboard, Kernersville
- Outdoor Equipment & Accessories, Kernersville
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