Stevenson Township is located in Marion County, Illinois. As of the 2010 census, its population was 1,301 and it contained 516 housing units.
Stevenson Township (T2N R3E) is centered at 38ð36'N 88ð52'W (38.602, -88.864). It is traversed eastâÂÂwest by U.S. Route 50. According to the 2010 census, the township has a total area of , of which (or 99.92%) is land and (or 0.11%) is water.