Cerro Gordo County (/ˈsɛroʊ ˈɡɔːrdoʊ/; Spanish: ) is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 43,127. Its county seat is Mason City. The county is named for the Battle of Cerro Gordo, which took place during the Mexican–American War.
