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

As of the 2010 census, its population was 8,217 and it contained 3,335 housing units.

[2] According to the 2010 census, the township has a total area of 39.33 square miles (101.9 km2), of which 39.09 square miles (101.2 km2) (or 99.39%) is land and 0.24 square miles (0.62 km2) (or 0.61%) is water.

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