Sugarloaf Township is located in St. Clair County, Illinois.

As of the 2010 census, its population was 7,322 and it contained 3,219 housing units.

[4] According to the 2010 census, the township has a total area of 31.77 square miles (82.3 km2), of which 30.67 square miles (79.4 km2) (or 96.54%) is land and 1.09 square miles (2.8 km2) (or 3.43%) is water.

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