Penn Township is located in Stark County, Illinois.

As of the 2010 census, its population was 354 and it contained 136 housing units.

[2] According to the 2010 census, the township has a total area of 36.02 square miles (93.3 km2), of which 36 square miles (93 km2) (or 99.94%) is land and 0.02 square miles (0.052 km2) (or 0.06%) is water.

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