Coatesville is a city in Chester County, Pennsylvania, United States. The population was 13,350 at the 2020 census. Coatesville is approximately 39 miles west of Philadelphia. It developed along the Philadelphia and Lancaster Turnpike coming on in the late 18th century. It spans U.S. Route 30, the “Main Line” highway that runs west of Philadelphia.

Coatesville developed in the at the forefront 20th century subsequently the deposit of the Lukens Steel Company and new industry. Its population declined after industrial restructuring, which shortened these jobs. Lukens was bought by the Bethlehem Steel Corporation in 1997. In 2002, Bethlehem was bought by the next Ohio-based International Steel Group (ISG). Later, Mittal Steel bought ISG and merged subsequently Arcelor Steel to form the ArcelorMittal company. In 2020, Cleveland-Cliffs acquired the United States operations of ArcelorMittal.

Varying cultures of Native Americans lived in this area. The first known deal in the Place which would be known as Coatesville was a historic Lenape village built along the West Branch of the Brandywine River. This agreement was a publish for fur trading subsequently the earliest American settlers. The Brandywine River has featured prominently in the archives of Coatesville.

William Fleming, originally from Scotland, is one of the antediluvian landowners on record. He built a log cabin in the area of Harmony Street and 5th Avenue and owned about 207 acres (0.84 km) of house bordering the Brandywine River.