Senachwine Township is located in Putnam County, Illinois.

As of the 2010 census, its population was 745 and it contained 651 housing units.

[2] According to the 2010 census, the township has a total area of 40.07 square miles (103.8 km2), of which 31.86 square miles (82.5 km2) (or 79.51%) is land and 8.21 square miles (21.3 km2) (or 20.49%) is water.

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