History Donegal was one of the original townships established in Westmoreland County in 1773. According to historian John Boucher, its original boundaries were much larger, constituting the majority of the Ligonier valley and extending into what is now Fayette County. Boucher states that "the village" of Donegal was incorporated in 1867.
History Donegal was one of the original townships established in Westmoreland County in 1773. According to historian John Boucher, its original boundaries were much larger, constituting the majority of the Ligonier valley and extending into what is now Fayette County Boucher states that "the village" of Donegal was incorporated in 1867.