- Office Supplies, Equipment & Office Furniture Stores, Tarentum
- Offset Printing, Tarentum
- Oil & Petroleum Products, Tarentum - Merchant, Wholesalers, etc
- Oil Extraction Downhole, Tarentum
- Oil Industry & Oil Field Equipment & Services, Tarentum - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Tarentum
- Opticians, Tarentum
- Optometrists, Tarentum - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Tarentum - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Tarentum
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- Ornamental Nursery Services, Tarentum
- Orthodontist, Tarentum - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Tarentum
- Other Attorneys & Lawyers, Tarentum
- Other Building Materials & Supplies, Tarentum
- Other Industrial Contractors, Tarentum
- Other Lawyers & Attorneys, Tarentum
- Outdoor & Lawn & Garden Equipment Repair & Service, Tarentum
- Outerwear Stores, Tarentum - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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