East Caln Township is a township in Chester County, Pennsylvania, United States. The population was 5,380 at the 2020 census. The township wraps around the east half of Downingtown and is mostly indistinguishable from it. East Caln Township is very developed, containing several shopping centers, including the regionally important Brandywine Square Center, several recently constructed housing developments varying from condominiums to large single family homes, and some industry in the southern fringe of the township.