Cerro Gordo Cerro Gordo County 525 9th Street SESuite 3Mason City, Iowa 50401Phone: (641) 210-7015Fax: (641) 201-3992 CountiesAllamakee Black Hawk Butler Cerro Gordo Chickasaw Clayton Emmet Fayette Floyd Grundy Hancock Howard Humboldt Mitchell Pocahontas Tama Webster Winneshiek Wright