Downingtown is a borough in Chester County, Pennsylvania, United States, 33 miles west of Philadelphia. As of the 2020 census, it had a population of 7,898. Downingtown was settled by European colonists in the early 18th century and has a number of historic buildings and structures. Some iconic places: Longwood Gardens, Brandywine Museum of Art, American Helicopter Museum & Education Center, Marsh Creek State Park