- Obstetricians & Gynecologists, Moundsville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Moundsville
- Oil & Gas Exploration & Development, Moundsville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Land Leases Properties & Royalties, Moundsville
- Oil & Gas Producers, Moundsville - Companies
- Oil & Petroleum Products, Moundsville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Moundsville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Moundsville - Oil Companies
- Ophthalmologists, Moundsville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Moundsville
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- Optometrists, Moundsville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Moundsville - Dentists - Oral & Maxillofacial Surgeons
- Organ Donation & Tissue Banks, Moundsville
- Ornamental Nursery, Moundsville
- Ornamental Nursery Services, Moundsville
- Orthodontist, Moundsville - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Moundsville
- Other Attorneys & Lawyers, Moundsville
- Other Building Materials & Supplies, Moundsville
- Other Lawyers & Attorneys, Moundsville
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