Westfield is a town in Union County, New Jersey, United States. As of the 2010 United States Census, the town's population was 30,316, reflecting an increase of 672 (+2.3%) from the 29,644 counted in the 2000 Census, which had in turn increased by 774 (+2.7%) 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.