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.

Together with nearby Carol Stream, Wheaton is particularly known for its denominational and interdenominational religious activities, mainly Evangelical Christian in character. The city is also the headquarters of the Theosophical Society in America. Wheaton College, which originated there in 1854 as the Illinois Institute (organized by the Wesleyan Methodist Church), has long been a prominent Evangelical (Evangelical church) Christian liberal arts college. The influential conservative journal Christianity Today is published in Carol Stream. Wheaton is the headquarters of some two dozen religious publishers and organizations.

Cantigny, a 500-acre (200-hectare) recreation area, includes gardens, golf courses, the First Division Museum (military history), and the Robert R. McCormick (McCormick, Robert R) Museum (1896), a home built by newspaper publisher Joseph Medill (Medill, Joseph). Inc. village, 1859; city, 1890. Pop. (2000) 55,416; (2006 est.) 54,611.