Counties
See also: List of counties in PennsylvaniaSince at least the early 20th century, scholarly books such as Guidebook to Historic Western Pennsylvania, published by the University of Pittsburgh Press (1938), formally define the region as the 26 counties west of the Appalachian divide, a meridian from the north at McKean County down and along McKean's eastern border and ending in the south at Bedford County.
In alphabetical order those counties are:
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Read more about this topic: Western Pennsylvania