Mahanoy Township is a township in Schuylkill County, Pennsylvania, United States. The population was 3,045 at the 2020 census. According to the United States Census Bureau, the township has a total area of 21.1 square miles, of which 20.9 square miles is land and 0.3 square mile is water. Its southern boundary areas are on Broad Mountain and the n…Mahanoy Township is a township in Schuylkill County, Pennsylvania, United States. The population was 3,045 at the 2020 census. According to the United States Census Bureau, the township has a total area of 21.1 square miles, of which 20.9 square miles is land and 0.3 square mile is water. Its southern boundary areas are on Broad Mountain and the northern tier is also mountainous, so most of the people live in the valley of the Mahanoy Creek, which flows westward into the Susquehanna River.