Niantic Township is located in Macon County, Illinois.

As of the 2010 census, its population was 842 and it contained 351 housing units.

[2] According to the 2010 census, the township has a total area of 29.28 square miles (75.8 km2), of which 29.22 square miles (75.7 km2) (or 99.80%) is land and 0.06 square miles (0.16 km2) (or 0.20%) is water.

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