Troy Grove Township is located in LaSalle County, Illinois.

As of the 2010 census, its population was 1,333 and it contained 556 housing units.

[2] According to the 2010 census, the township has a total area of 35.71 square miles (92.5 km2), of which 35.67 square miles (92.4 km2) (or 99.89%) is land and 0.04 square miles (0.10 km2) (or 0.11%) is water.

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