Wheaton is a city in and the county seat of DuPage County, Illinois, United States. It is located Milton and Winfield townships approximately 25 …Wheaton is a city in and the county seat of DuPage County, Illinois, United States. It is located Milton and Winfield townships approximately 25 miles west of Chicago. As of the 2020 census, Wheaton's population was 53,970, making it the 27th-most populous municipality in Illinois.
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