Lemont Township is one of 29 townships in Cook County, Illinois, USA. As of the 2020 census, its population was 22,645 and it contained 8,580 housing units. According to the 2021 census gazetteer files, Lemont Township has a total area of 21.02 square miles, of which 20.37 square miles is land and 0.65 square miles is water.
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