- Obstetricians & Gynecologists, Christiansburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Christiansburg
- Occupational Therapy, Christiansburg - Occupational Health Specialists
- Off Road Vehicles, Christiansburg
- Off Road Vehicles Parts & Accessories, Christiansburg
- Office Supplies, Equipment & Office Furniture Stores, Christiansburg
- Oil & Gas Producers, Christiansburg - Companies
- Oil Change & Lubrication, Christiansburg - Auto Oil & Quick Lube
- Oncologists, Christiansburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Christiansburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Christiansburg
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Christiansburg
- Opticians, Christiansburg
- Optometrists, Christiansburg - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oriental Rugs, Christiansburg
- Ornamental Greenhouses, Christiansburg
- Ornamental Nursery, Christiansburg
- Ornamental Nursery Services, Christiansburg
- Orthopedic & Prosthetic Appliances & Shoes, Christiansburg - Orthopedic Shoes
- Orthotics and Prosthetics, Christiansburg
- Other Building Materials & Supplies, Christiansburg
- Other Lodging, Christiansburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Christiansburg
- Outdoor Equipment & Accessories, Christiansburg
- Outdoor Furniture & Patio Furniture, Christiansburg - Garden Furniture Stores
- Outpatient Services, Christiansburg - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Christiansburg - Oxygen Concentrator, Tank, Machine, etc
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