|DuPage County Illinois Cities/Towns - Addison, Bensenville, Bloomingdale, Bolingbrook, Carol Stream, Clarendon Hills, Darien, Downers Grove, Elmhurst, Glendale Heights, Glen Ellyn, Hinsdale, Itasca, Lisle, Lombard, Medinah, Naperville, Oakbrook, Roselle, Villa Park, Warrenville, Westmont, West Chicago, Wheaton (County Seat), Willowbrook, Winfield, Woodbridge, Wood Dale, York Center
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DuPage County is a county located in the U.S. state of Illinois. 2016 U.S. Census estimates its population to be 929,368. Its county seat is the city of Wheaton.
DuPage County was formed in 1839. The county took its name from the DuPage River, which was, in turn, named after a French fur trapper, DuPage.