Mason City Township is located in Mason County, Illinois, United States.

As of the 2010 census, its population was 2,633 and it contained 1,220 housing units.

[2] According to the 2010 census, the township has a total area of 35.51 square miles (92.0 km2), of which 35.42 square miles (91.7 km2) (or 99.75%) is land and 0.09 square miles (0.23 km2) (or 0.25%) is water.

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