Until 2003, US 113 continued north from Milford concurrently with DE 1 along four-lane divided Bay Road to Dover. Soon after US 113 joined DE 1, the roadway crossed Swan Creek to the east of Tub Mill Pond. The route headed north and intersected Thompsonville Road before crossing Old Baptist Church Branch. The U.S. Highway crossed the Murderkill River while passing to the east of the town of Frederica. At the north end of Frederica, the highway met the eastern end of DE 12 (Frederica Road). US 113 passed by historic Barratt's Chapel, the birthplace of Methodism in the United States. The highway met the southern end of US 113 Alternate (Clapham Road) at a Y intersection in the village of Little Heaven. US 113 crossed the St. Jones River on the Barkers Landing Bridge and curved northwest at its intersections with the southern end of DE 9 (Bayside Drive) and the western end of Kitts Hummock Road. The highway became a freeway along the edge of Dover Air Force Base. US 113 had a diamond interchange with Old Lebanon Road, which served the main gate of the air force base to the northeast and base housing to the southwest. At the next interchange, a partial cloverleaf interchange with the eastern end of DE 10 (Lebanon Road) next to the military base's north gate, US 113 exited onto Bay Road while DE 1 continued on the Korean War Veterans Memorial Highway. The U.S. Highway had ramps from northbound US 113 to northbound DE 1, from southbound US 113 to southbound DE 1, and from southbound DE 1 to US 113 just south of its partial interchange with the Puncheon Run Connector freeway, which connected DE 1 and US 113 with US 13 on the south side of Dover. US 113 entered the city of Dover and passed between the DelDOT headquarters and the Blue Hen Corporate Center, which was transformed into a corporate center from the defunct Blue Hen Mall in 1995. The route intersected Court Street (named Martin Luther King Jr. Boulevard since 2013)/South Little Creek Road, with Court Street heading west to the Dover Green Historic District and Delaware Legislative Hall, before reaching its northern terminus at a Y intersection with US 13 and the northern end of US 113 Alternate (DuPont Highway).