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is an affluent community located in DuPage County, Illinois, approximately west of Chicago and Lake Michigan. Wheaton is the county seat of DuPage County. As of the 2000 census, the city had a total population of 55,676. It is a part of the Chicago metropolitan area and the Illinois Technology and Research Corridor.
According to the United States Census Bureau, the city has a total area of 11.3 square miles (29.2 km²). 11.2 square miles (29.1 km²) of it is land and 0.1 km² (0.04 sq mi or 0.35%) of it is water.
Wheaton is the sister city of Karlskoga, Sweden. Karlskoga Street, located along the southern edge of Memorial Park in Downtown Wheaton, is named after the Swedish City.