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is an affluent city in Kane and DuPage counties of Illinois, United States, and is roughly west of Chicago on Illinois Route 64. According to a 2004 census estimate, the city has a total population of 32,134. The official city slogan is
, after the Fox River that runs through the center of town. St. Charles is part of a tri-city area along with Geneva and Batavia, all far-western suburbs of similar size and relative socioeconomic condition.
St. Charles is located at 41°54'49" North, 88°18'39" West (41.913744, -88.31085).
According to the United States Census Bureau, the city has a total area of of which, is land and is water. The total area is 1.13% water.