Caln Township is a township in Chester County, Pennsylvania, Unite States. The population was 11,916 at the 2000 census. The township was founded by settlers from Calne, Wiltshire in England in 1714. The relationship with Calne, Wiltshire continues today as the two towns are sister cities. The Township is a Township of the First Class. The Governing Body is a Board of Commissioners. The Board President is Jill Kelly Hammond, Vice President James Mayrides, Board Members Joshua Young, Jim Kruse, William Chambers. The Township Manager is Gregory Prowant.