Marengo Township is located in McHenry County, Illinois.

As of the 2020 census, its population was 7,202 and it contained 3,065 housing units.

Marengo is a city located in the township.

According to the 2010 census, the township has a total area of 35.91 square miles (93.0 km2), of which 35.89 square miles (93.0 km2) (or 99.94%) is land and 0.02 square miles (0.052 km2) (or 0.06%) is water.

This McHenry County, Illinois location article is a stub.