US 113 has a length of in Delaware, where the route is named DuPont Boulevard. The highway extends the length of Sussex County and into far southern Kent County. US 113 runs from Selbyville at the Maryland state line to Milford, a city that lies in both Sussex and Kent counties. Between those municipalities, US 113 serves the towns of Frankford, Dagsboro, Millsboro, Georgetown, and Ellendale. The U.S. Highway intersects several east–west highways that connect US 113 with the Delaware beach towns to the east, including Lewes, Reboboth Beach, Dewey Beach, Bethany Beach, and Fenwick Island. The following includes a description of US 113's former course from Milford to Dover, most of which is now solely DE 1.