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is a city in Hardin County, Kentucky, United States. The population was 21,961 at the 2000 census. It is included in the Elizabethtown, Kentucky Metropolitan Statistical Area.
Its economy is largely dominated by the county seat of Hardin County, Elizabethtown, as well as Fort Knox, as it sits by the entrance to the base. Its population reflects the transient military officers who work on post.
In 1988, a youth group from the First Assembly of God in Radcliff was involved in the worst drunk-driving accident in U.S. history, a bus accident in which a drunk driver going the wrong way on Interstate 71 hit the group's vehicle, killing 27 people in the crash and the resulting fire.
Despite being in a dry county (Hardin), sales by the drink in restaurants seating at least 100 diners are allowed.
According to the United States Census Bureau, the city has a total area of 11.5 square miles (29.7 km²), of which, 11.5 square miles (29.7 km²) of it is land and 0.09% is water.