Old Town Township is located in McLean County, Illinois.

As of the 2010 census, its population was 3,010 and it contained 1,046 housing units.

[2] According to the 2010 census, the township has a total area of 35.49 square miles (91.9 km2), of which 35.46 square miles (91.8 km2) (or 99.92%) is land and 0.03 square miles (0.078 km2) (or 0.08%) is water.

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