- Obstetricians & Gynecologists, Wytheville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Wytheville
- Occupational Therapy, Wytheville - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Wytheville
- Oil Change & Lubrication, Wytheville - Auto Oil & Quick Lube
- Oncologists, Wytheville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Wytheville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Wytheville
- Opticians, Wytheville
- Optometrists, Wytheville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Wytheville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Wytheville
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- Ornamental Nursery Services, Wytheville
- Orthodontist, Wytheville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Wytheville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Wytheville
- Other Attorneys & Lawyers, Wytheville
- Other Building Materials & Supplies, Wytheville
- Other Lawyers & Attorneys, Wytheville
- Other Lodging, Wytheville
- Outdoor & Lawn & Garden Equipment Repair & Service, Wytheville
- Outdoor Furniture & Patio Furniture, Wytheville - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Wytheville - Oxygen Concentrator, Tank, Machine, etc
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