Scranton is the sixth-largest city in the Commonwealth of Pennsylvania behind Philadelphia, Pittsburgh, Allentown, Erie and Reading. It is the county seat of Lackawanna County in Northeastern Pennsylvania's Wyoming Valley and hosts a federal court building. With a population of 77,291, it is the largest city in the Scranton–Wilkes-Barre–Hazleton, PA Metropolitan Statistical Area, which has a population of about 570,000.