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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 United States Supreme Court and subordinate courts generally apply the aptly named Lemon test to determine whether religious expression with a governmental connection is palatable under the Constitution. The test is named for the plaintiff in Lemon v. Kurtzman, 403 U.S. 602 (1971).