- Obstetricians & Gynecologists, Elkin - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Elkin
- Off Road Vehicles Parts & Accessories, Elkin
- Office Buildings & Parks, Elkin
- Oil Change & Lubrication, Elkin - Auto Oil & Quick Lube
- Oncologists, Elkin - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Elkin - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Elkin
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- Opticians, Elkin
- Optometrists, Elkin - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Elkin - Dentists - Oral & Maxillofacial Surgeons
- Orthopedic & Prosthetic Appliances & Shoes, Elkin - Orthopedic Shoes
- Orthopedists, Elkin - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Elkin
- Overhead Door, Elkin
- Oxygen & Respiratory Equipment & Supplies, Elkin - Oxygen Concentrator, Tank, Machine, etc
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