Pittsburgh is the second-largest city in the Commonwealth of Pennsylvania, and the county seat of Allegheny County. The Combined Statistical Area (CSA) population of 2,659,937 is the largest in both the Ohio Valley and Appalachia and the 20th-largest in the United States. In 2015, Pittsburgh was listed among the "eleven most livable cities in the world". Google, Apple, Bosch, Facebook, Uber, Nokia, Autodesk, and IBM are among 1,600 technology firms generating $20.7 billion in annual Pittsburgh payrolls. The area has served also as the long-time federal agency headquarters for cyber defense, software engineering, robotics, energy research and the nuclear navy. The area is home to 68 colleges and universities, including research and development leaders Carnegie Mellon University and the University of Pittsburgh. The nation's fifth-largest bank, eight Fortune 500 companies, and six of the top 300 US law firms make their global headquarters in the Pittsburgh area, while RAND, BNY Mellon, Nova, FedEx, Bayer and NIOSH have regional bases that helped Pittsburgh become the sixth-best area for U.S. job growth.
