Allens Grove Township is located in Mason County, Illinois. As of the 2010 census, its population was 586 and it contained 255 housing units.[2]
Geography
According to the 2010 census, the township has a total area of 35.77 square miles (92.6 km2), of which 35.72 square miles (92.5 km2) (or 99.86%) is land and 0.04 square miles (0.10 km2) (or 0.11%) is water.[2]