Elk Township is a township in Tioga County, Pennsylvania, United States. The population was 45 at the 2020 census, and 49 at the 2010 census. There were five children under the age of 19 years. According to the United States Census Bureau, the township has a total area of 74.0 square miles, of which 73.9 square miles is land and 0.1 square mileā¦Elk Township is a township in Tioga County, Pennsylvania, United States. The population was 45 at the 2020 census, and 49 at the 2010 census. There were five children under the age of 19 years. According to the United States Census Bureau, the township has a total area of 74.0 square miles, of which 73.9 square miles is land and 0.1 square miles is water.