U.S. Route 9 (US 9) is a United States Numbered Highway in the Northeastern U.S., running from Laurel, Delaware, north to Champlain, New York. In Delaware, the route runs a southwest–northeast path through Sussex County. Even though US 9 is signed north–south for the remainder of its route, the segment in Delaware is signed east–west. The highway runs from its western terminus at US 13 in Laurel northeast to the Cape May–Lewes Ferry terminal in Lewes, where the ferry carries the route across the Delaware Bay to North Cape May, New Jersey. US 9 passes through rural areas and serves the communities of Laurel, Georgetown, and Lewes. US 9 intersects Delaware Route 20 (DE 20) in Hardscrabble, US 113 and DE 18/DE 404 in Georgetown, DE 30 in Gravel Hill, DE 5 in Harbeson, and DE 1 at the Five Points intersection in Nassau. US 9 runs concurrent with DE 404 between Georgetown and Five Points and with DE 1 between Five Points and Carpenters Corner.

The Cape May–Lewes Ferry is a ferry system in the United States that traverses a 17-mile (27 km) crossing of the Delaware Bay connecting North Cape May, New Jersey with Lewes, Delaware. The ferry constitutes a portion of U.S. Route 9 and is the final crossing of the Delaware River-Delaware Bay waterway before it meets the Atlantic Ocean. It is only one of two direct crossings between Delaware and New Jersey, the other being the Delaware Memorial Bridge