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.
Winfield is home to one of the oldest taverns in the Chicago suburbs, John's Restaurant and Tavern (formerly John's Buffet), founded 1921 by Polish immigrant John Karwoski, grandfather of the current owner, John Karwoski III. John Karwoski was instrumental in the political and economical development of Winfield, and it was his guidance and leadership that took a fledgling prairie town clinging to existence after the railroad boom went bust, and turned it into a viable and livable village.