La Prairie Township is located in Marshall County, Illinois.

As of the 2010 census, its population was 364 and it contained 158 housing units.

[2] La Prairie Township was originally named Fairfield Township, but changed its name in December, 1850.

According to the 2010 census, the township has a total area of 36.01 square miles (93.3 km2), all land.

This Marshall County, Illinois location article is a stub.