Pittsburgh is a city in the Commonwealth of Pennsylvania in the United States, and is the county seat of Allegheny County. As of 2017, a total population of 305,704 inhabitants within the city limits. The metropolitan population of 2,353,045 is the largest in both the Ohio Valley and Appalachia, and the second-largest in Pennsylvania (behind Philadelphia).
The area is home to 68 colleges and universities, including research and development leaders Carnegie Mellon University and the University of Pittsburgh.