Saco is a city in York County, Maine, United States. The population was 16,822 (estimated to be near or more than 18,214 in 2007) at the 2000 census. It is home to Ferry Beach State Park, Funtown Splashtown USA, Thornton Academy, as well as General Dynamics Armament Systems (also known by its former name, Saco Defense), a subsidiary of the defense contractor General Dynamics. Saco sees much tourism during summer months, due to its amusement parks, Ferry Beach State Park, and proximity to Old Orchard Beach.Saco is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. Saco's twin-city is Biddeford.

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