Harrison Township is located in Winnebago County, Illinois.

As of the 2010 census, its population was 670 and it contained 273 housing units.

[5] According to the 2010 census, the township has a total area of 24.73 square miles (64.1 km2), of which 24.61 square miles (63.7 km2) (or 99.51%) is land and 0.12 square miles (0.31 km2) (or 0.49%) is water.

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