Westmoreland County, PA
History
Formed from Lancaster, Northumberland, and later Bedford counties, Westmoreland County was founded on February 26, 1773, and was the first county in the Pennsylvania colony whose entire territorial boundary was located west of the Allegheny Mountains. Westmoreland County originally included the present-day counties of Fayette, Washington, Greene, and parts of Beaver, Allegheny, Indiana, and Armstrong counties. It is named after Westmorland, a historic county of England.Source: Wikipedia
Modern Day Adjacent Counties
Armstrong County (north)Indiana County (northeast)
Cambria County (east)
Somerset County (southeast)
Fayette County (south)
Washington County (southwest)
Allegheny County (west)
Butler County (northwest)