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is a village in McHenry County, Illinois, United States. The population was 15,531 at the 2000 census. A 2003 special census put the village's population at 17,827.
According to the United States Census Bureau, the village has a total area of 5.3;square miles (13.8 km²), of which, 5.2 square miles (13.6 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.13%) is water. It is located on the Fox River, which runs through northern Illinois.