title: DuPage County, Illinois
text: DuPage County () is a county in the U.S. state of Illinois. As of the 2010 census, the population was 916,924, making it Illinois' second-most populous county. Its county seat is Wheaton.
  
  DuPage County has become mostly developed and suburbanized. Residents of Hinsdale, Naperville, and Oak Brook include some of the richest people in the Midwest, and in 2010, Midwest Living voted Hinsdale the Midwest's second-richest town.
  
  References
  
   
  1839 establishments in Illinois