Long Branch Township is located in Saline County, Illinois.

As of the 2010 census, its population was 248 and it contained 103 housing units.

[2] According to the 2010 census, the township has a total area of 18.31 square miles (47.4 km2), of which 18.26 square miles (47.3 km2) (or 99.73%) is land and 0.05 square miles (0.13 km2) (or 0.27%) is water.

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