Cottage Township is located in Saline County, Illinois.

As of the 2010 census, its population was 219 and it contained 108 housing units.

[2] According to the 2010 census, the township has a total area of 31.06 square miles (80.4 km2), of which 30.56 square miles (79.2 km2) (or 98.39%) is land and 0.49 square miles (1.3 km2) (or 1.58%) is water.

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