Haines Township is located in Marion County, Illinois. As of the 2010 census, its population was 1,002 and it contained 422 housing units.
Haines Township (T1N R3E) is centered at 38ð31'N 88ð52'W (38.519, -88.869). According to the 2010 census, the township has a total area of , of which (or 99.89%) is land and (or 0.08%) is water.