- Obstetricians & Gynecologists, Bethel Park - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Bethel Park
- Oil & Gas Exploration & Development, Bethel Park - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Bethel Park - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Bethel Park - Oil Companies
- Oncologists, Bethel Park - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Bethel Park - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Bethel Park
- Opticians, Bethel Park
- Optometrists, Bethel Park - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Bethel Park - Eye Clinics
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- Ornamental Nursery, Bethel Park
- Ornamental Nursery Products, Bethel Park
- Ornamental Nursery Services, Bethel Park
- Orthodontist, Bethel Park - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Bethel Park - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Bethel Park
- Osteoporosis Doctors, Bethel Park - Physicians & Surgeons
- Other Building Materials & Supplies, Bethel Park
- Outdoor & Lawn & Garden Equipment Repair & Service, Bethel Park
- Outdoor Equipment & Accessories, Bethel Park
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