Winfield is a town in Winfield Township, Lake County, Indiana, United States. The population was 2,298 at the 2000 census, 4,383 in 2010 and 5,073 in 2013. The town was incorporated in 1993 in order to keep the residents from being annexed by Merrillville. Prior to that time it had been part of Winfield Township as an unincorporated town. Winfield is named for General Winfield Scott. The town is served by the Crown Point post office, therefore most places within Winfield have a "Crown Point" address.
Currently, the town does not have an established police department and receives its law enforcement services from the Lake County Sheriff's Department.