Sadsbury Township is a township in Chester County, Pennsylvania, United States. The population was 4,125 at the 2020 census. According to the United States Census Bureau, the township has a total land area of 6.17 square miles with a total water area of 0.03 square miles. It includes the village of Sadsburyville in the north, and the census-designated plac…Sadsbury Township is a township in Chester County, Pennsylvania, United States. The population was 4,125 at the 2020 census. According to the United States Census Bureau, the township has a total land area of 6.17 square miles with a total water area of 0.03 square miles. It includes the village of Sadsburyville in the north, and the census-designated place of Pomeroy in the south.