Barnhill Township is located in Wayne County, Illinois.

As of the 2010 census, its population was 597 and it contained 275 housing units.

[2] According to the 2010 census, the township has a total area of 33.88 square miles (87.7 km2), of which 33.71 square miles (87.3 km2) (or 99.50%) is land and 0.17 square miles (0.44 km2) (or 0.50%) is water.

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