Sullivan Township is located in Moultrie County, Illinois.

As of the 2010 census, its population was 6,263 and it contained 2,872 housing units.

[2] According to the 2010 census, the township has a total area of 66.61 square miles (172.5 km2), of which 59.46 square miles (154.0 km2) (or 89.27%) is land and 7.15 square miles (18.5 km2) (or 10.73%) is water.

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