By 1930, PA 63 had seven auxiliary routes: PA 163, PA 263, PA 363, PA 463, PA 563, PA 663, and PA 763. PA 63 was moved to its current alignment between Willow Grove and Bethayres by 1940, with the former alignment of the route between these two points becoming a rerouted PA 163. Also by this time, PA 63 was rerouted to follow Byberry Road between Philmont Avenue and PA 532. By 1950, the PA 163 designation was removed from Edge Hill Road and Terwood Road.