Grover Township is located in Wayne County, Illinois.

As of the 2010 census, its population was 3,757 and it contained 1,941 housing units.

[2] According to the 2010 census, the township has a total area of 19.67 square miles (50.9 km2), of which 19.65 square miles (50.9 km2) (or 99.90%) is land and 0.02 square miles (0.052 km2) (or 0.10%) is water.

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