Leef Township is located in Madison County, Illinois, in the United States.

As of the 2010 census, its population was 628 and it contained 246 housing units.

[2] Leef Township was named for the Swiss immigrant Jacob Leu, who anglicized his name to Leef.

[3] According to the 2010 census, the township has a total area of 29.38 square miles (76.1 km2), of which 29.26 square miles (75.8 km2) (or 99.59%) is land and 0.11 square miles (0.28 km2) (or 0.37%) is water.

This Madison County, Illinois location article is a stub.