Liberty Lake is a city in Spokane County, Washington, United States, located adjacent to the eponymous lake. Located just over a mile (about 2 km) west of the Washington–Idaho border, Liberty Lake is both a suburb of Spokane, Washington, and a bedroom community to Coeur d'Alene, Idaho. The population was 12,003 at the 2020 census, and was estimated at 13,353 in 2024.