Prairieton Township is one of twelve townships in Vigo County, Indiana, United States. As of the 2010 census, its population was 1,222 and it contained 517 housing units.
According to the 2010 census, the township has a total area of , of which (or 96.33%) is land and (or 3.67%) is water.
The township contains New Harmony Cemetery. Prairieton Cemetery is located in Prairieton, Indiana.