Big Spring Township is located in Shelby County, Illinois.

As of the 2010 census, its population was 698 and it contained 326 housing units.

[2] According to the 2010 census, the township has a total area of 29.67 square miles (76.8 km2), of which 29.32 square miles (75.9 km2) (or 98.82%) is land and 0.35 square miles (0.91 km2) (or 1.18%) is water.

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