Coatesville is a city in Chester County. Coatesville is approximately 39 miles west of Philadelphia. It developed alongLancaster Avenue. beginning in the late 18th century. It spans Rt. 30, the "Main Line" highway that runs west of Philadelphia.

Coatesville developed in the early 20th century with the growth of the Lukens Steel Company and other industry. Its population declined after industrial restructuring. Lukens was bought by the Bethlehem Steel Corporation in 1997. 

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