Winfield is an incorporated village located in Milton and Winfield Townships, DuPage County, Illinois, United States. The population was 8,718 at the 2000 census, and estimated to be 9,984 in 2008. Winfield is home to Central DuPage Hospital, one of the largest hospitals in the Chicago suburbs. Winfield has a Metra station on the Union Pacific/West Line, which provides regular commuter rail service to Chicago.