Mountain Township is located in Saline County, Illinois.

As of the 2020 census, its population was 395 and it contained 181 housing units.

[2] According to the 2010 census, the township has a total area of 42.86 square miles (111.0 km2), of which 41.87 square miles (108.4 km2) (or 97.69%) is land and 1 square mile (2.6 km2) (or 2.33%) is water.

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