Washington Township is a township in Northampton County, Pennsylvania, United States. The population of Washington Township was 5,122 at the 2010 census. Washington Township is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th-most populous metropolitan area in the U.S. as of the 2020 census.

Ackermanville is a census-designated place located on PA Route 191 in Washington Township, Northampton County, Pennsylvania, United States. As of the 2022 American Community Survey, the village's population was 280. Ackermanville is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th-most populous metropolitan area in the U.S. as of the 2020 census. It was named for the Ackerman family.