Flat Branch Township is located in Shelby County in the U.S. state of Illinois.

As of the 2010 census, its population was 443 and it contained 181 housing units.

[2] According to the 2010 census, the township has a total area of 33.78 square miles (87.5 km2), of which 33.78 square miles (87.5 km2) (or 100%) is land and 0.01 square miles (0.026 km2) (or 0.03%) is water.

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