Ripley County, Missouri County Courthouse 100 Courthouse Sq Doniphan, MO 63935 Phone:(573) 996-3215 Fax:(573) 996-9774 www.ripleycountymissouri.org/ripley.asp On the southeastern border of MO, southwest of Cape Girardeau; organized Jan 5, 1833 from Wayne County.Name Origin:For Gen. Eleazar ...