Spring Bay Township is located in Woodford County, Illinois, United States.

As of the 2010 census, its population was 2,643 and it contained 1,133 housing units.

[2] According to the 2010 census, the township has a total area of 16.92 square miles (43.8 km2), of which 10.28 square miles (26.6 km2) (or 60.76%) is land and 6.64 square miles (17.2 km2) (or 39.24%) is water.

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