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

As of the 2010 census, its population was 1,047 and it contained 450 housing units.

[2] According to the 2010 census, the township has a total area of 31.26 square miles (81.0 km2), of which 28.89 square miles (74.8 km2) (or 92.42%) is land and 2.37 square miles (6.1 km2) (or 7.58%) is water.

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