Riley Township is located in McHenry County, Illinois.

As of the 2020 census, its population was 3,035 and it contained 1,070 housing units.

According to the 2010 census, the township has a total area of 36.04 square miles (93.3 km2), of which 35.97 square miles (93.2 km2) (or 99.81%) is land and 0.08 square miles (0.21 km2) (or 0.22%) is water.

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