Little Elm is a city in Denton County, Texas, United States, and a part of the Dallas–Fort Worth metroplex. It is an extended suburb of Denton; its population was 46,453 as of the 2020 census. In 2000, the census population was at 3,646. By the 2010 census, the city total had jumped to 25,898, making Little Elm one of the fastest-growing municipalities by percentage in Texas since 2000.