Westfield is a suburban city in Hamilton County, Indiana, United States. As of 2023, the population was 58,410. Westfield is in the Indianapolis m…Westfield is a suburban city in Hamilton County, Indiana, United States. As of 2023, the population was 58,410. Westfield is in the Indianapolis metropolitan area. Westfield was founded on May 6, 1834, by North Carolina Quakers Asa 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 made harsher, part of the Westfield Quaker Friends Meeting House split off into the Anti-Slavery Friends meeting.