Pilesgrove Township is a township in Salem County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 4,183, an increase of 167 (+4.2%) from the 2010 census count of 4,016, which in turn reflected an increase of 93 (+2.4%) from the 3,923 counted in the 2000 census.