- Obstetricians & Gynecologists, Kingsport - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Kingsport
- Occupational Health Care Physicians & Surgeons, Kingsport - Occupational Medicine
- Occupational Health Care Professionals, Kingsport
- Office Supplies, Equipment & Office Furniture Stores, Kingsport
- Oil & Petroleum Products, Kingsport - Merchant, Wholesalers, etc
- Oil & Petroleum Retail, Kingsport
- Oil Change & Lubrication, Kingsport - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Kingsport - Oil Companies
- Oil Petroleum Wholesale, Kingsport
- Oils - Fuel - Alternative, Kingsport
- Old Age Homes Service, Kingsport
- Oncologists, Kingsport - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Kingsport - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Kingsport - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Kingsport
- Opticians, Kingsport
- Optometrists, Kingsport - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Kingsport - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Kingsport
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- Ornamental Nursery, Kingsport
- Ornamental Nursery Services, Kingsport
- Orthodontist, Kingsport - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Kingsport - Orthopedic Shoes
- Orthopedic Shoes, Kingsport
- Orthopedists, Kingsport - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Kingsport
- Other Attorneys & Lawyers, Kingsport
- Other Building Materials & Supplies, Kingsport
- Other Electrical Products, Kingsport
- Other Lawyers & Attorneys, Kingsport
- Other Lodging, Kingsport
- Outdoor & Lawn & Garden Equipment Repair & Service, Kingsport
- Outdoor Advertising & Billboard, Kingsport
- Outdoor Equipment & Accessories, Kingsport
- Outdoor Furniture & Patio Furniture, Kingsport - Garden Furniture Stores
- Outpatient Services, Kingsport - Outpatient Care
- Ownership Organizations, Kingsport
- Oxygen & Respiratory Equipment & Supplies, Kingsport - Oxygen Concentrator, Tank, Machine, etc
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