U.S. Federal Route 15 is a north-south highway in Northwestern York County. It runs from the Cumberland/York County Line, north of Dillsburg, to the Adams/Cumberland County Line, south of Clear Springs. U.S. Rt. 15 passes through the following towns in York County. Dillsburg Clear Springs U.S. Rt. 15 is multi-plexed in York County. Pennsylvania State Route 74, at Dillsburg.