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

As of the 2010 census, its population was 6,718 and it contained 2,782 housing units.

[2] According to the 2010 census, the township has a total area of 47.73 square miles (123.6 km2), of which 46.69 square miles (120.9 km2) (or 97.82%) is land and 1.05 square miles (2.7 km2) (or 2.20%) is water.

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