Definition
The U.S. Census Bureau defines the area as both a MSA consisting of seven Western Pennsylvania counties anchored by the city of Pittsburgh and a twelve county Pittsburgh–New Castle-Weirton CSA with 2 West Virginia counties and one in Ohio. The MSA definition includes the city proper and the Pennsylvania counties of Allegheny, Armstrong, Beaver, Butler, Fayette, Washington, and Westmoreland. The CSA definition also adds the two Western Pennsylvania counties of Lawrence and Indiana, West Virginia's Brooke and Hancock as well as Ohio's Jefferson.
The MSA had a 2012 population of 2,360,733 and has a land area of 5,343 sq. miles, while the CSA had a 2012 population of 2,661,369. Pittsburgh is part of the Great Lakes Megalopolis containing an estimated 54 million people, while many residents also consider themselves part of the Mid-Atlantic coastal region of Virginia to New York. It is classified as Northeast by the U.S. Census with the West Virginia and Ohio components of the CSA being classified as South and Mid-west respectively. The entire MSA and CSA are within the Congressional Appalachian Regional Commission's definition of Appalachia.
The area is also sometimes defined as even reaching into southwestern New York State and the extreme western counties of Maryland.
Read more about this topic: Pittsburgh Metropolitan Area
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