High Quality Content by WIKIPEDIA articles! U.S. Route 13 passes through the Philadelphia metropolitan area in the U.S. state of Pennsylvania. The route enters the state from Delaware in Marcus Hook, Delaware County. It continues in a northeasterly direction through Delaware County, passes through Philadelphia, and continues into Bucks County, where it ends at U.S. 1 in Falls Township, west of the borough of Morrisville. Throughout most of its route in Pennsylvania, U.S. Route 13 runs within a close distance of Interstate 95.