The Pittsburgh–New Castle–Weirton, PA–OH–WV Combined Statistical Area is a 12-county Combined Statistical Area (CSA) in the United States. The principal city of the area is the City of Pittsburgh, Pennsylvania but the CSA includes parts of the states of Pennsylvania, West Virginia, and Ohio. It was officially defined by the U.S. Census Bureau in 2013. The estimated population of the area was 2,635,228 in mid-2016.