- Obstetricians & Gynecologists, Prestonsburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office & Meeting Equipment & Supplies Rental, Prestonsburg
- Office Furniture & Equipment Rental & Leasing, Prestonsburg
- Office Supplies, Equipment & Office Furniture Stores, Prestonsburg
- Oil & Gas Consultants, Prestonsburg
- Oil & Gas Exploration & Development, Prestonsburg - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Prestonsburg - Companies
- Oil & Petroleum Products, Prestonsburg - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Prestonsburg - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Prestonsburg - Oil Companies
- Oil Petroleum Wholesale, Prestonsburg
- Oils Industrial, Prestonsburg
- Optical Goods Repair & Service, Prestonsburg - Camera Repair
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Prestonsburg
- Opticians, Prestonsburg
- Optometrists, Prestonsburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Orthodontist, Prestonsburg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Prestonsburg - Orthopedic Shoes
- Other Attorneys & Lawyers, Prestonsburg
- Other Attorneys & Lawyers, Prestonsburg
- Other Building Materials & Supplies, Prestonsburg
- Other Lawyers & Attorneys, Prestonsburg
- Outdoor Equipment & Accessories, Prestonsburg
- Outpatient Services, Prestonsburg - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Prestonsburg - Oxygen Concentrator, Tank, Machine, etc
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