Alton Township, Madison County, Illinois

Alton Township is located in Madison County, Illinois, in the United States. As of the 2010 census, its population was 27,865 and it contained 13,266 housing units.

Geography
According to the 2010 census, the township has a total area of 16.74 sqmi, of which 15.47 sqmi (or 92.41%) is land and 1.27 sqmi (or 7.59%) is water.