DE 15 turns north to form a concurrency with US 13 for a short distance on the four-lane divided South Dupont Highway before continuing northwest along with US 13 Alt. on two-lane undivided Upper King Road. The road continues through rural land before entering the town of Woodside. Here, US 13 Alt./DE 15 passes homes and intersects DE 10 Alt., with DE 15 splitting from US 13 Alt. by heading west along with DE 10 Alt. on Main Street and crossing the Delmarva Central Railroad's Delmarva Subdivision line at-grade.