Hennepin Township is located in Putnam County, Illinois.

As of the 2010 census, its population was 1,261 and it contained 573 housing units.

[2] According to the 2010 census, the township has a total area of 43.24 square miles (112.0 km2), of which 41.35 square miles (107.1 km2) (or 95.63%) is land and 1.89 square miles (4.9 km2) (or 4.37%) is water.

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