Foster Township, Madison County, Illinois
|Elevation||548 ft (167.0 m)|
|Area||31.34 sq mi (81.2 km2)|
|- land||30.86 sq mi (80 km2)|
|- water||0.48 sq mi (1 km2)|
|Density||132.6/sq mi (51.2/km2)|
|Settled||November 2, 1875|
|- summer (DST)||CDT (UTC-5)|
Location in Madison County
Location of Illinois in the United States
Foster is the name of Oliver Foster, a pioneer settler and native of New Hampshire.
According to the 2010 census, the township has a total area of 31.34 square miles (81.2 km2), of which 30.86 square miles (79.9 km2) (or 98.47%) is land and 0.48 square miles (1.2 km2) (or 1.53%) 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. 512.
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