Coatesville is the only city in Chester County, Pennsylvania, United States. The population was 13,350 at the 2020 census. Coatesville is approx…Coatesville is the only 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 beginning in the late 18th century. It spans U.S. Route 30, the "Main Line" highway that runs west of Philadelphia.
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