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

As of the 2010 census, its population was 1,668 and it contained 722 housing units.

[2] According to the 2010 census, the township has a total area of 43.85 square miles (113.6 km2), of which 42.96 square miles (111.3 km2) (or 97.97%) is land and 0.89 square miles (2.3 km2) (or 2.03%) is water.

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