U.S. Federal Route 13 is a north-south highway in New Castle County. It runs from the Pennsylvania/Delaware State Line, near Naamans Corner, to the Kent/New Castle County Line, near Smyrna. U.S. Rt. 13 passes through the following towns in New Castle County. Naamans Corner Wilmington New Castle Odessa Smyrna U.S. Rt. 13 is multi-plexed in New Castle County. Delaware State Route 9, at Wilmington. U.S. Rt. 40, near New Castle. TRUCK Delaware State Route 9, from Hares Corner to State Road. Delaware State Route 1, near Wrangle Hill.