 By 1960, the northern terminus was moved to PA 23 in King of Prussia.PA 252 was realigned to head to its current northern terminus at Valley Forge by 1970, running along a concurrency with US 202 (removed by 1980) for a distance north of Paoli and replacing a part of PA 83 in the Valley Forge area.PA 252 begins at an intersection with PA 320 north of the city of Chester in Nether Providence Township, Delaware County, heading north-northwest on two-lane undivided Providence Road.