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

As of the 2010 census, its population was 726 and it contained 288 housing units.

[2] According to the 2010 census, the township has a total area of 29.78 square miles (77.1 km2), of which 29.57 square miles (76.6 km2) (or 99.29%) is land and 0.22 square miles (0.57 km2) (or 0.74%) is water.

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