Foster Township, Madison County, Illinois

Foster Township is located in Madison County, Illinois, in the United States. As of the 2010 census, its population was 4,091 and it contained 1,663 housing units.

History
Foster is the name of Oliver Foster, a pioneer settler and native of New Hampshire.

Geography
According to the 2010 census, the township has a total area of 31.34 sqmi, of which 30.86 sqmi (or 98.47%) is land and 0.48 sqmi (or 1.53%) is water.