Okawville Township is located in Washington County, Illinois.

As of the 2010 census, its population was 1,987 and it contained 886 housing units.

[2] According to the 2010 census, the township has a total area of 36.35 square miles (94.1 km2), of which 36.26 square miles (93.9 km2) (or 99.75%) is land and 0.09 square miles (0.23 km2) (or 0.25%) is water.

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