For the Lake of Clear Lake, see Clear Lake.Clear Lake is a city in Cerro Gordo County, Iowa, United States. The population was 7,777 at the 2010 census. The city is named for the large lake on which it is located. It is the home of a number of marinas, state parks and tourism-related businesses. Clear Lake is also a major stop on Interstate 35 with many restaurants, hotels and truck stops.Nelson P. Crabb was elected mayor of Clear Lake in 2005 and began his term as mayor in January 2006.