Eldorado Township is located in McDonough County, Illinois.

As of the 2010 census, its population was 134 and it contained 85 housing units.

[2] According to the 2010 census, the township has a total area of 36.53 square miles (94.6 km2), of which 36.48 square miles (94.5 km2) (or 99.86%) is land and 0.05 square miles (0.13 km2) (or 0.14%) is water.

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