Port Authority of Allegheny County
![](/Images/godic/202501/31/Port_Authority_bus_Pittsburgh4706.JPG")
![Port Authority light rail train, Washington Junction Station, March 2005.](/Images/godic/202501/31/Pittsburgh_light_rail4706.jpg")
![The Steel Plaza subway station.](/Images/godic/202501/31/Steel_Plaza_Subway_Station4706.JPG")
![](/Images/godic/202501/31/Trolley_at_Arlington_stop_fr_Mt_Lebanon_Blvd_jeh4707.JPG")
Port Authority of Allegheny County (also known as the Port Authority and formerly as Port Authority Transit (PAT) and PATransit) is the second-largest public transit agency in Pennsylvania and the 26th-largest in the United States. The county-owned, state-funded agency is based in Pittsburgh and is overseen by a CEO and a nine-member board of upaid volunteer directors, who are appointed by the county executive and approved by the county council.