- Obstetricians & Gynecologists, Blacksburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Blacksburg - Occupational Medicine
- Occupational Health Care Professionals, Blacksburg
- Office Supplies, Equipment & Office Furniture Stores, Blacksburg
- Oil & Gas Producers, Blacksburg - Companies
- Oil Change & Lubrication, Blacksburg - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Blacksburg - Oil Companies
- Oil Petroleum Wholesale, Blacksburg
- Ophthalmologists, Blacksburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Blacksburg
- Opticians, Blacksburg
- Optometrists, Blacksburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Blacksburg
- Ornamental Greenhouses, Blacksburg
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- Ornamental Nursery, Blacksburg
- Ornamental Nursery Services, Blacksburg
- Orthodontist, Blacksburg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Blacksburg - Orthopedic Shoes
- Orthopedists, Blacksburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Blacksburg
- Osteoporosis Doctors, Blacksburg - Physicians & Surgeons
- Other Attorneys & Lawyers, Blacksburg
- Other Attorneys & Lawyers, Blacksburg
- Other Building Materials & Supplies, Blacksburg
- Other Electrical Products, Blacksburg
- Other Lawyers & Attorneys, Blacksburg
- Other Lodging, Blacksburg
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