Mantua Township is a township in Monroe County, Iowa, United States. History Mantua Township was organized in 1845.[1] References [1]The History of Monroe County, Iowa: Containing a History of the County, Its Cities, &c. Western Historical Company. 1878. pp. 363. 41.0308°N 92.6972°W / 41.0308; -92.6972 This article about the geography of Monroe County, Iowa is a stub. You can help Wikipedia by expanding it.vteWikiwand - on Seamless Wikipedia browsing. On steroids.