Elizabethtown is a city in Hardin County, Kentucky, United States, and its county seat. The population was 31,394 at the 2020 census, making it the ninth-most populous city in the state. It is the principal city of the Elizabethtown metropolitan area, which is included in the Louisville/Jefferson County–Elizabethtown–Madison, Kentucky-Indiana combined statistical area. The Elizabethtown metropolitan area had a population of 125,569 in 2020. Elizabethtown is a home-rule class city under Kentucky law.