Westfield is a town in Union County of New Jersey, United States. As of the 2010 United States Census, the town's population was 30,316, reflecting an increase of 672 from the 29,644 counted in the 2000 Census, which had in turn increased by 774 from the 28,870 counted in the 1990 Census. According to a 2014 nationwide survey, Westfield is considered to be the 30th-safest city to live in the United States.