Hardin County (redirected fromHardin County, OH) Hardin County, Iowa 1215 Edgington Ave County Courthouse Eldora, IA 50627 Phone:(641) 939-8109 Fax:(641) 939-8245 hardincountyonline.com In central IA, east of Fort Dodge; established Jan 15, 1851 from Black Hawk County.Name Origin:For Gen...