- Office Supplies, Equipment & Office Furniture Stores, Ambridge
- Oil & Petroleum Products, Ambridge - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Ambridge - Oil Companies
- Optical Goods Repair & Service, Ambridge - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ambridge
- Opticians, Ambridge
- Optometrists, Ambridge - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Ambridge - Eye Clinics
- Orthodontist, Ambridge - Teeth Straightening, Invisalign & Dental Braces
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