Marion Township is one of sixteen townships in Franklin County, Iowa, United States. As of the 2010 census, its population was 1,030 and it contained 464 housing units.
Marion Township was organized in 1874.
As of the 2010 census, Marion Township covered an area of ; of this, (99.91 percent) was land and (0.09 percent) was water.
(This list is based on USGS data and may include former settlements.)
The township contains Coulter Cemetery, Marion Center Cemetery and Saint Pauls Evangelical Lutheran Cemetery.