Riverdale Township is a township in Kossuth County, Iowa, United States.[1] History Riverdale Township was organized in 1885.[2] References [1]U.S. Geological Survey Geographic Names Information System: Riverdale Township, Kossuth County, Iowa [2]Reed, Benjamin F. (1913). History of Kossuth County, Iowa, Volume 1. S. J. Clarke Publishing Company. p. 575. 42.9517°N 94.2661°W / 42.9517; -94.2661 This article about the geography of Kossuth County, Iowa is a stub. You can help Wikipedia by expanding it.vteWikiwand - on Seamless Wikipedia browsing. On steroids.