Falls Township is a suburban Philadelphia township in Bucks County, Pennsylvania, United States. The population was 34,300 at the 2010 census. Portions of Fairless Hills and Levittown, Pennsylvania, are located in the township. Portions of Falls Township are called Morrisville and Yardley, due to the location of the Morrisville Post Office outside the …Falls Township is a suburban Philadelphia township in Bucks County, Pennsylvania, United States. The population was 34,300 at the 2010 census. Portions of Fairless Hills and Levittown, Pennsylvania, are located in the township. Portions of Falls Township are called Morrisville and Yardley, due to the location of the Morrisville Post Office outside the Borough of Morrisville in Falls Township. As originally chartered in 1692, the villages of Morrisville and Tullytown were part of Falls Township. Morrisville was granted borough status in 1804. Tullytown was established as a borough in 1891.