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DuPage County, Illinois

county in Illinois

DuPage County (/ˌdˈp/) is a county in the U.S. state of Illinois. As of the 2010 census, the population was 916,924,[1] making it Illinois' second-most populous county. Its county seat is Wheaton.[2]

DuPage County has become mostly developed and suburbanized. Residents of Hinsdale, Naperville, and Oak Brook include some of the wealthiest people in the Midwest, and in 2010, Midwest Living voted Hinsdale the Midwest's second-wealthiest town.[3]


  1. "State & County QuickFacts". United States Census Bureau. Archived from the original on July 9, 2011. Retrieved July 4, 2014.
  2. "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved 2011-06-07.
  3. Slodyosko, Brian. "Poverty rate rising in Downers Grove Township". Chicago Tribune. Archived from the original on 4 April 2017. Retrieved 22 March 2017.