- Obstetricians & Gynecologists, Huntington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Huntington
- Occupational Health Care Physicians & Surgeons, Huntington - Occupational Medicine
- Occupational Health Care Professionals, Huntington
- Occupational Medicine Doctors, Huntington - Physicians & Surgeons
- Occupational Therapy, Huntington - Occupational Health Specialists
- Office Furniture Manufacturers, Huntington
- Office Supplies, Equipment & Office Furniture Stores, Huntington
- Oil & Gas Companies, Huntington
- Oil & Gas Exploration & Development, Huntington - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Huntington - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Huntington - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Huntington - Oil Companies
- Old Age Homes Service, Huntington
- Oncologists, Huntington - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Door Church, Huntington
- Ophthalmologists, Huntington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Huntington
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Huntington
- Opticians, Huntington
- Optometrists, Huntington - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Huntington - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Huntington
- Ornamental Greenhouses, Huntington
- Ornamental Nursery, Huntington
- Ornamental Nursery Products, Huntington
- Ornamental Nursery Services, Huntington
- Orthodontist, Huntington - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Huntington
- Orthopedic & Prosthetic Appliances & Shoes, Huntington - Orthopedic Shoes
- Orthopedists, Huntington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Huntington
- Other Building Materials & Supplies, Huntington
- Other Office Supply Stores, Huntington
- Outdoor & Lawn & Garden Equipment Repair & Service, Huntington
- Outdoor Advertising & Billboard, Huntington
- Outdoor Equipment & Accessories, Huntington
- Outdoor Furniture & Patio Furniture, Huntington - Garden Furniture Stores
- Outpatient Services, Huntington - Outpatient Care
- Overhead Door, Huntington
- Oxygen & Respiratory Equipment & Supplies, Huntington - Oxygen Concentrator, Tank, Machine, etc
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