Prairie du Long Township, St. Clair County, Illinois

Prairie du Long Township is located in St. Clair County, Illinois. As of the 2010 census, its population was 2,244 and it contained 864 housing units.

Geography
According to the 2010 census, the township has a total area of 35.97 sqmi, of which 35.53 sqmi (or 98.78%) is land and 0.44 sqmi (or 1.22%) is water.