- Occupational Health Care Professionals, Radford
- Occupational Therapy, Radford - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Radford
- Oil & Gas Companies, Radford
- Oil & Petroleum Products, Radford - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Radford - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Radford - Oil Companies
- Oil Petroleum Wholesale, Radford
- Ophthalmologists, Radford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Radford
- Opticians, Radford
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- Ornamental Metal Work, Radford - Steel, Iron, Bronze, etc
- Ornamental Nursery, Radford
- Ornamental Nursery Services, Radford
- Orthodontist, Radford - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Radford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Radford
- Outdoor Centers, Radford
- Outdoor Equipment & Accessories, Radford
- Outdoor Power Equipment, Radford
- Outpatient Services, Radford - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Radford - Oxygen Concentrator, Tank, Machine, etc
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