Westampton is a township in Burlington County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 9,121, an increase of 308 from the 2010 census count of 8,813, which in turn reflected an increase of 1,596 from the 7,217 counted in the 2000 census. The township, and all of Burlington County, is a part of the P…Westampton is a township in Burlington County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 9,121, an increase of 308 from the 2010 census count of 8,813, which in turn reflected an increase of 1,596 from the 7,217 counted in the 2000 census. The township, and all of Burlington County, is a part of the Philadelphia-Reading-Camden combined statistical area and the Delaware Valley.