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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.
The Lemon test, based on the 1971 U.S. Supreme Court ruling in Lemon v. Kurtzman, is the standard of judicial review in cases involving the establishment clause of the First Amendment.