Tredyffrin Township is a township located in eastern Chester County, Pennsylvania, United States. The population was 29,332 at the 2010 census. Settled in the late 17th century, Tredyffrin is bounded by Delaware and Montgomery counties. It includes on its northern boundary a small part of Valley Forge National Historical Park, where George Washington e…Tredyffrin Township is a township located in eastern Chester County, Pennsylvania, United States. The population was 29,332 at the 2010 census. Settled in the late 17th century, Tredyffrin is bounded by Delaware and Montgomery counties. It includes on its northern boundary a small part of Valley Forge National Historical Park, where George Washington encamped during the American War of Independence. Tredyffrin and the entire Great Valley region also have many limestone deposits. Tredyffrin is the most populous township in Chester County.
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