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] 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.

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