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Lemont is a village located in Cook, DuPage, and Will counties in the U.S. state of Illinois, and is a suburb of Chicago. The population was 16,000 as of the 2010 census. Lemont has a substantial immigrant population. Lemont is home to the CITGO Refinery, Argonne National Laboratory and other heavy industrial sites.
In the 18th century, French voyageurs traveled down the Des Plaines River, trading Native Americans metal, beads and cloth for animal furs and changing the Native American lifestyle forever. Established in 1836, the village of Lemont stands as one of the oldest American communities in northeastern Illinois.