Marissa Township, St. Clair County, Illinois

Marissa Township is located in St. Clair County, Illinois. As of the 2010 census, its population was 2,468 and it contained 1,175 housing units.

Geography
According to the 2010 census, the township has a total area of 35.97 sqmi, of which 34.44 sqmi (or 95.75%) is land and 1.53 sqmi (or 4.25%) is water.