The U.S. Geological Survey National Mapping Information locates Mason City at 43° 8' 55" N 093° 12' 7" W.
Mason City is a city in Cerro Gordo County, Iowa, United States. The population was 29,172 at the 2000 census (2005 estimate 27,909) and has stayed close to 30,000 since 1995. It is the county seat of Cerro Gordo County. It is the home of the North Iowa Area Community College and Hamilton College.
Mason City is widely known for its sizable amount of Prairie School architecture, the largest concentration in one location outside of Oak Park, Illinois. The Rock Glen and Rock Crest districts along Willow Creek feature homes designed by Frank Lloyd Wright and Walter Burley Griffin. Wright's Stockman House has been restored and is open to the public. Wright's Park Inn Hotel, which influenced Bauhaus founder Walter Gropius and other European Modern architects, is the only remaining hotel in the world designed by him still standing, and is in the process of being restored.