- Obstetricians & Gynecologists, Martins Ferry - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Martins Ferry
- Oil & Gas Companies, Martins Ferry
- Oil & Gas Exploration & Development, Martins Ferry - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Martins Ferry - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Martins Ferry - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Martins Ferry
- Optometrists, Martins Ferry - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orthopedic & Prosthetic Appliances & Shoes, Martins Ferry - Orthopedic Shoes
- Orthotics and Prosthetics, Martins Ferry
- Other Building Materials & Supplies, Martins Ferry
- Other Lodging, Martins Ferry
- Outdoor Equipment & Accessories, Martins Ferry
- Outpatient Services, Martins Ferry - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Martins Ferry - Oxygen Concentrator, Tank, Machine, etc
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