Harristown Township is located in Macon County, Illinois, USA.

As of the 2010 census, its population was 1,921 and it contained 793 housing units.

[2][3] According to the 2010 census, the township has a total area of 28.29 square miles (73.3 km2), of which 28.1 square miles (73 km2) (or 99.33%) is land and 0.19 square miles (0.49 km2) (or 0.67%) is water.

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