- Occupational Health Care Physicians & Surgeons, Paintsville - Occupational Medicine
- Occupational Health Care Professionals, Paintsville
- Off Road Vehicles, Paintsville
- Off Road Vehicles Parts & Accessories, Paintsville
- Oil & Gas Exploration & Development, Paintsville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Well Drilling Services, Paintsville
- Oil Change & Lubrication, Paintsville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Paintsville - Oil Companies
- Oil Well Equipment & Supplies, Paintsville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Paintsville
- Opticians, Paintsville
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- Optometrists, Paintsville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Paintsville - Dentists - Oral & Maxillofacial Surgeons
- Orthodontist, Paintsville - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Paintsville
- Other Attorneys & Lawyers, Paintsville
- Other Building Materials & Supplies, Paintsville
- Other Lawyers & Attorneys, Paintsville
- Otolaryngologists, Paintsville - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Paintsville
- Outdoor Furniture & Patio Furniture, Paintsville - Garden Furniture Stores
- Outpatient Services, Paintsville - Outpatient Care
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