Mackinaw Township is located in Tazewell County, Illinois.

As of the 2010 census, its population was 4,454 and it contained 1,675 housing units.

[2] According to the 2010 census, the township has a total area of 36.34 square miles (94.1 km2), of which 36.15 square miles (93.6 km2) (or 99.48%) is land and 0.18 square miles (0.47 km2) (or 0.50%) is water.

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