Le township Coffins Grove, appelé initialement Coffin's Grove, avec l'apostrophe, est organisé en 1855. Il est baptisé en référence à Clement Coffin, un pionnier[3].
↑(en) The History of Delaware County, Iowa : Containing a History of the County, Its Cities, Towns, &c., a Biographical Directory of Its Citizens, War Record of Its Volunteers ... History of the Northwest, History of Iowa, Map of Delaware County, Constitution of the United States, Western historical Company, , 707 p., p. 555.