- Obstetricians & Gynecologists, Aliquippa - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Aliquippa
- Occupational Therapy, Aliquippa - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Aliquippa
- Oil Change & Lubrication, Aliquippa - Auto Oil & Quick Lube
- Oils Recycling, Aliquippa
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Aliquippa
- Opticians, Aliquippa
- Optometrists, Aliquippa - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Aliquippa
- Ornamental Nursery Services, Aliquippa
- Orthodontist, Aliquippa - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Aliquippa - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Aliquippa
- Other Lodging, Aliquippa
- Outdoor & Lawn & Garden Equipment Repair & Service, Aliquippa
- Outdoor Equipment & Accessories, Aliquippa
- Outpatient Services, Aliquippa - Outpatient Care
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