Westville is a borough in Gloucester County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 4,264, a decrease of 24 from the 2010 census count of 4,288, which in turn reflected a decline of 212 from the 4,500 counted in the 2000 census. Westville has been called "The Gateway to South Jersey!"