Leef Township, Madison County, Illinois
|Elevation||558 ft (170.1 m)|
|Area||29.38 sq mi (76.1 km2)|
|- land||29.26 sq mi (76 km2)|
|- water||0.11 sq mi (0 km2)|
|Density||21.5/sq mi (8.3/km2)|
|Settled||November 2, 1875|
|- summer (DST)||CDT (UTC-5)|
Location in Madison County
Location of Illinois in the United States
Leef Township was named for the Swiss immigrant Jacob Leu, who anglicized his name to Leef.
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.
- "Population, Housing Units, Area, and Density: 2010 - County -- County Subdivision and Place -- 2010 Census Summary File 1". United States Census. Retrieved 2013-05-28.
- Norton, William T. (1912). Centennial History of Madison County, Illinois, and Its People, 1812 to 1912. The Lewis Publishing Co. p. 562.
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