Falls Township is one of sixteen townships in Cerro Gordo County, Iowa, United States. As of the 2000 census, its population was 1,093. Falls Township covers an area of 35.3 square miles and contains two incorporated settlements: Plymouth and Rock Falls. According to the USGS, it contains three cemeteries: Bohemian, Oakwood and Rock …Falls Township is one of sixteen townships in Cerro Gordo County, Iowa, United States. As of the 2000 census, its population was 1,093. Falls Township covers an area of 35.3 square miles and contains two incorporated settlements: Plymouth and Rock Falls. According to the USGS, it contains three cemeteries: Bohemian, Oakwood and Rock Falls.