Greenbush Township is located in Warren County, Illinois. As of the 2010 census, its population was 533 and it contained 286 housing units.[2]
Geography
According to the 2010 census, the township has a total area of 35.81 square miles (92.7 km2), of which 35.45 square miles (91.8 km2) (or 98.99%) is land and 0.36 square miles (0.93 km2) (or 1.01%) is water.[2]