- U.S. Geological Survey Geographic Names Information System: Ion, Iowa
- W. E. Alexander (1882). History of Winneshiek and Allamakee Counties, Iowa. Western Publishing Company. p. 398.
- Ellery M. Hancock (1913). Past and Present of Allamakee County, Iowa: A Record of Settlement, Organization, Progress and Achievement. S. J. Clarke publishing Company. p. 271.
|This article about the geography of Allamakee County, Iowa is a stub. You can help Wikipedia by expanding it.|