 In 1941, PA 519 was "swapped" with what was U.S. 19 at that time, now running along Morganza Road in North Strabane, joining then-PA 28 in South Fayette Township and ending at Crafton Boulevard/Noblestown Road (then-U.S. 22/U.S.30) in Crafton Heights (PA 28/Noblestown Road continued with a right turn from here).In 1947, PA 519 was extended to its current southern terminus at U.S. 40 in Glyde.