- Obstetricians & Gynecologists, Huntington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Track Betting, Huntington
- Office Supplies, Equipment & Office Furniture Stores, Huntington
- Oil Change & Lubrication, Huntington - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Huntington - Oil Companies
- Oil Petroleum Wholesale, Huntington
- Ophthalmologists, Huntington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Huntington
- Opticians, Huntington
- Optometrists, Huntington - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Huntington - Dentists - Oral & Maxillofacial Surgeons
- Oriental Goods & Products Stores, Huntington
- Ornamental Nursery, Huntington
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- Ornamental Nursery Products, Huntington
- Ornamental Nursery Services, Huntington
- Orthodontist, Huntington - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Huntington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Huntington
- Other Attorneys & Lawyers, Huntington
- Other Building Materials & Supplies, Huntington
- Other Lawyers & Attorneys, Huntington
- Outdoor & Lawn & Garden Equipment Repair & Service, Huntington
- Outdoor Advertising & Billboard, Huntington
- Outdoor Equipment & Accessories, Huntington
- Outdoor Furniture & Patio Furniture, Huntington - Garden Furniture Stores
- Overhead Door, Huntington
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