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DuPage County is a county in the U.S. state of Illinois, and one of the collar counties of the Chicago metropolitan area. As of the 2020 census, the population was 932,877, making it Illinois' second-most populous county. Its county seat is Wheaton.
Country:
United States
State:
Illinois
Founded:
February 9, 1839
Named for:
DuPage River
Seat:
Wheaton
Largest city:
Aurora
Area code:
630 and 331
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Data from:
en.wikipedia.org