- Obstetricians & Gynecologists, Sewickley - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Sewickley
- Oil & Gas Producers, Sewickley - Companies
- Oil Change & Lubrication, Sewickley - Auto Oil & Quick Lube
- Ophthalmologists, Sewickley - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Sewickley
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Sewickley
- Opticians, Sewickley
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- Optometrists, Sewickley - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Sewickley
- Ornamental Nursery, Sewickley
- Ornamental Nursery Services, Sewickley
- Orthodontist, Sewickley - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Sewickley - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Sewickley - Physicians & Surgeons
- Other Building Materials & Supplies, Sewickley
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