- Southern Terminus:
- Providence Avenue (PA 320) and Chester Road (PA 320) in Wallingford
- Northern Terminus:
- PA 23 in King of Prussia
- 19.89 miles
PA 252 is a north/south route in the suburbs of Philadelphia. It splits off from PA 320 about a mile and a half north of the Delaware Expressway (I-95). It runs north, parallel to and west of the Mid-County Expressway (I-476), to Media, where it has an interchange with the Media Bypass (US 1). It continues north through Newtown Square and Paoli before curving to the east just south of the US 202 expressway. It turns north onto Valley Forge Road, passing through an interchange with US 202 and then crossing the Pennsylvania Turnpike (I-76) with no interchange. PA 252 follows Valley Forge Road and Valley Creek Road through Valley Forge National Historical Park, where it ends at PA 23.