Greene Township is located in Mercer County, Illinois.

As of the 2010 census, its population was 1,640 and it contained 692 housing units.

[2] According to the 2010 census, the township has a total area of 36.74 square miles (95.2 km2), of which 36.72 square miles (95.1 km2) (or 99.95%) is land and 0.02 square miles (0.052 km2) (or 0.05%) is water.

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