- Obstetricians & Gynecologists, Roanoke - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Roanoke
- Occupational Health Care Physicians & Surgeons, Roanoke - Occupational Medicine
- Occupational Health Care Professionals, Roanoke
- Occupational Therapy, Roanoke - Occupational Health Specialists
- Office Buildings & Parks, Roanoke
- Office Supplies, Equipment & Office Furniture Stores, Roanoke
- Offset Printing, Roanoke
- Oil & Gas Companies, Roanoke
- Oil & Gas Producers, Roanoke - Companies
- Oil & Petroleum Products, Roanoke - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Roanoke - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Roanoke - Oil Companies
- Oil Petroleum Wholesale, Roanoke
- Oils Recycling, Roanoke
- Old Age Homes Service, Roanoke
- Oncologists, Roanoke - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmic Goods, Roanoke
- Ophthalmologists, Roanoke - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Roanoke
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Roanoke
- Opticians, Roanoke
- Optometrists, Roanoke - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Roanoke - Eye Clinics
- Oral Surgeon, Roanoke - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Roanoke
- Organ Donation & Tissue Banks, Roanoke
- Organizing Services & Products – Household & Business, Roanoke
- Oriental Food Products, Roanoke
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- Oriental Rugs, Roanoke
- Ornamental Greenhouses, Roanoke
- Ornamental Nursery, Roanoke
- Ornamental Nursery Services, Roanoke
- Orthodontist, Roanoke - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Roanoke
- Orthodox Synagogues, Roanoke
- Orthopedic & Prosthetic Appliances & Shoes, Roanoke - Orthopedic Shoes
- Orthopedic Shoes, Roanoke
- Orthopedists, Roanoke - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Roanoke
- Other Attorneys & Lawyers, Roanoke
- Other Attorneys & Lawyers, Roanoke
- Other Building Materials & Supplies, Roanoke
- Other Electrical Products, Roanoke
- Other Lawyers & Attorneys, Roanoke
- Other Lodging, Roanoke
- Other Office Supply Stores, Roanoke
- Outdoor & Lawn & Garden Equipment Repair & Service, Roanoke
- Outdoor Advertising & Billboard, Roanoke
- Outdoor Centers, Roanoke
- Outdoor Equipment & Accessories, Roanoke
- Outdoor Furniture, Roanoke
- Outdoor Furniture & Patio Furniture, Roanoke - Garden Furniture Stores
- Outdoor Power Equipment Repair, Roanoke
- Outpatient Clinics, Roanoke - Care & Treatment Centers
- Outpatient Services, Roanoke - Outpatient Care
- Ownership Organizations, Roanoke
- Oxygen & Respiratory Equipment & Supplies, Roanoke - Oxygen Concentrator, Tank, Machine, etc
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