High Quality Content by WIKIPEDIA articles! U.S. Route 13 is the main north–south highway in the U.S. state of Delaware. It traverses the entire length of the state from the Maryland border in Delmar, Sussex County to the Pennsylvania border in Claymont, New Castle County. U.S. Route 13 connects many important cities and towns in Delaware, including Wilmington, Dover, and Seaford. It was the main route between Wilmington and Dover and a part of the main route from Wilmington to the Delaware beaches until the Delaware Route 1 turnpike was completed. It continues to serve as the main route from Delaware to points south, such as Salisbury, Maryland and Norfolk, Virginia. The entire length of U.S. Route 13 in Delaware is a divided highway with the exceptions of the segment through Wilmington and parts of Philadelphia Pike in Claymont. Between Wilmington and the Kent/Sussex County border, U.S. Route 13 in Delaware is known as Dupont Highway or Dupont Parkway. In Sussex County, the route is known as Sussex Highway.