Willistown Township is a township in Chester County, Pennsylvania, United States. Originally settled by Lenni Lenape Native Americans, Willistown Township was part of the 50,000 acres Welsh Tract surveyed for William Penn in 1684. The Holmes Map of 1681 is the first reference to Willistown, calling it “Willeston”. In 1704, Willistown was organized as a township. Bartram’s Covered Bridge, Garrett Farmstead, Okehocking Historic District, Sugartown Historic District, and White Horse Historic District are listed on the National Register of Historic Places.
Willistown Township borders Easttown Township, Newtown Township, Edgmont Township, Westtown Township, East Goshen Township, East Whiteland Township, Tredyffrin Township, and the borough of Malvern. Most of Willistown Township’s addresses are in ZIP codes 19355 and 19073, with small areas in ZIP codes 19382, 19380, 19301, and 19312. Willistown Township is a part of the suburban area west of Philadelphia known as the Main Line.