Westfield is a city in Hamilton County, Indiana, United States. In the year 2010 United States Census, the population was 30,068. Westfield is in the Indianapolis Metropolitan Area. Westfield was founded on May 6, 1834, by North CarolinaQuakersAsa Bales, Ambrose Osborne and Simon Moon. It is believed that the town was planned as a stop on the Underground Railroad with many families of the Religious Society of Friends and the Wesleyan Methodist Church supporting the cause. When the laws against aiding escaped slaves were harshened, part of the Westfield Quaker Friends Meeting House split into the Anti-Slavery Friends meeting.