- Obstetricians & Gynecologists, Johnstown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Oil & Gas Exploration & Development, Johnstown - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Johnstown - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Johnstown - Oil Companies
- Ophthalmologists, Johnstown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Johnstown
- Opticians, Johnstown
- Optometrists, Johnstown - Eye Doctors, Physicians & Surgeons (Optometry)
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