 The portion of route between Leesport and Maiden Creek became the eastern part of PA 383 by 1930.PA 73 was shifted to its current alignment in eastern Montgomery County in the 1950s.The western terminus of PA 73 was realigned to Leesport by 1966, with the route between Blue Ball and Reading becoming PA 625 with most of the remainder between Reading and Oley now unnumbered.