Westville is a borough in Gloucester County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 4,288, reflecting a decline of 212 (-4.7%) from the 4,500 counted in the 2000 Census, which had in turn declined by 73 (-1.6%) from the 4,573 counted in the 1990 Census. The Borough of Westville is known as "The Gateway to South Jersey."