About Tredyffrin
Tredyffrin Township is located at the easternmost edge of Chester County. According to the United States Census Bureau, the township has a total area of 19.9 square miles, of which, 19.8 square miles is land and 0.04 square miles is water. The earliest settlers were Welsh, and to them, the Township owes its name. Tre is the Welsh word for town, and Dyffryn means a wide cultivated valley; from these words comes the compound tre yr dyffrin, or Tredyffrin, meaning a township in a wide cultivated valley. The population was 29,062 at the 2000 census. Originally 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. There are many American Revolutionary War-related sites in the township, especially the park and houses where various generals were quartered. Bordering on the nearby Valley Forge National Park are several residential developments of exceptional homes situated on heavily wooded mountainside lots.