Kilbourne Township is located in Mason County, Illinois.

As of the 2010 census, its population was 504 and it contained 245 housing units.

[2] According to the 2010 census, the township has a total area of 40.36 square miles (104.5 km2), of which 40.1 square miles (104 km2) (or 99.36%) is land and 0.26 square miles (0.67 km2) (or 0.64%) is water.

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