Leander (/liˈændər/ lee-AN-dər) is a city in Williamson County and Travis County, Texas, United States. The population was 59,202 at the 2020 census and 74,375 at the 2022 census estimate.[6] A suburb just north of Austin, and part of the Greater Austin metropolitan area, it was the fastest-growing city in the United States between 2018 and 2019.[7]