Lyndon Township is located in Whiteside County, Illinois.

As of the 2010 census, its population was 1,057 and it contained 460 housing units.

[4] According to the 2010 census, the township has a total area of 28.08 square miles (72.7 km2), of which 27.27 square miles (70.6 km2) (or 97.12%) is land and 0.81 square miles (2.1 km2) (or 2.88%) is water.

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