- Obstetricians & Gynecologists, Waynesburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Waynesburg
- Occupational Health Care Professionals, Waynesburg
- Office Supplies, Equipment & Office Furniture Stores, Waynesburg
- Oil & Gas Exploration & Development, Waynesburg - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Waynesburg - Auto Oil & Quick Lube
- Oil Field Contractors, Waynesburg
- Oil Industry & Oil Field Equipment & Services, Waynesburg - Oil Companies
- Ophthalmologists, Waynesburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Waynesburg
- Opticians, Waynesburg
- Optometrists, Waynesburg - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Greenhouses, Waynesburg
- Ornamental Nursery, Waynesburg
- Ornamental Nursery Services, Waynesburg
- Orthodontist, Waynesburg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Waynesburg - Orthopedic Shoes
- Orthopedic Shoes, Waynesburg
- Orthopedists, Waynesburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Waynesburg
- Other Building Materials & Supplies, Waynesburg
- Other Industrial Contractors, Waynesburg
- Other Lodging, Waynesburg
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