- Institute-Transfusion Medicine
- Insurance Office Of Pittsburgh
- Insurance Overload Staffing
- Integrated Equities
- Internal Medicine Specialists
- International Business Assoc
- Interservers Technology
- Intestinal Disease Foundation
- Ira Weiss Law Office
- Ireland Institute-Pittsburgh
- Ireta
- Iron City Warehouse & Elevator
- Iron Mountain-Health Info Svc
- Israel & Specter
- Israel Wood & Puntil
- Italian Village Pizza
- J & B Sales Co
- J Bannahan Assoc Advertising
