Corydon was still shown on 1914 plats for Madison Township in Polk County. Unless I'm mistaken, Coydon is shown on the Outline Map of Polk County here:

                      http://digital.lib.uiowa.edu/cdm/compoundobject/collection/atlases/id/8707

Submitted by Iowa Ghost Town Visitor:  W. Wright. from  Iowa

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Stories of Towns Past

Corydon, Iowa

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