Liberty Lake is an incorporated city in Spokane County, Washington, United States, on the Idaho state line. Liberty Lake is a suburb of Spokane, Washington. Thus, it is situated between Spokane and Coeur d'Alene, Idaho. The population was 7,591 at the 2010 census.Liberty Lake was named after an Etienne Edward Laliberte, later he changed his name to Steve Liberty, a pioneer who settled near the lake.