city, seat (1867) of DuPage county, northeastern Illinois, U.S. It is a suburb of Chicago, located about 25 miles (40 km) west of downtown. The first settlers (1837) were Erastus Gary and brothers Warren and Jesse Wheaton, all of whom came from New England. The site was laid out in 1853 after the arrival (1849) of the Galena and Chicago Union Railroad, which stimulated growth.
Learn more about Wheaton with a free trial on Britannica.com.