Allegheny, county, southwestern Pennsylvania, U.S., consisting of a hilly region on the Allegheny Plateau bounded to the southeast by the Monongahela and Youghiogheny rivers and to the northeast by the Allegheny River.
The best things to see and do in Allegheny County, Pennsylvania. Includes Pittsburgh and surrounding areas in the county.
The official website of Allegheny County, PA, which provides information on services, licenses, records and permits for our citizens and businesses.
Read Western Pennsylvania's best local coverage of the latest Allegheny County news and events.