Scarborough is a town in Cumberland County on the southern coast of the U.S. state of Maine. Located about 7 miles (11 km) south of Portland, Scarborough is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. The population was 22,135 at the 2020 census, making it the most populous town in Maine.

U.S. Route 1 (US 1) in the U.S. state of Maine is a major north–south section of the United States Numbered Highway System, serving the eastern part of the state. It parallels the Atlantic Ocean from New Hampshire north through Portland, Brunswick, and Belfast to Calais, and then the St. Croix River and the rest of the Canada–United States border via Houlton to Fort Kent. The portion along the ocean, known as the Coastal Route, provides a scenic alternate to Interstate 95 (I-95).