Coatesville is a city in Chester County, Pennsylvania, United States. The population was 13,100 at the 2010 census. Coatesville is approximately 39 miles west of Philadelphia. Coatesville grew up around the Lukens Steel Company. Lukens was bought by the Bethlehem Steel Corporation in 1997. In 2002, Bethlehem was bought by the then Ohio-based International Steel Group (ISG). Later, Mittal Steel bought ISG and then merged with Arcelor Steel to form the ArcelorMittal company.
A general aviation airport, Chester County G. O. Carlson Airport, which allows private and corporate aircraft to easily access the town, is located about 3 miles (4.8 km) west in neighboring Valley Township, Coatesville is also served by the Coatesville Amtrak Station, which until 1997 also served the Paoli/Thorndale Line regional railroad from Philadelphia.