Decatur Township is in Macon County, Illinois. At the 2010 census, its population was 52,915 and it contained 24,918 housing units.
According to the 2010 census, the township has a total area of , of which (or 93.44%) is land and (or 6.59%) is water.
In the year of 2023, the population is 46,968 people with a median age of 37.9 and a median household income of $50,809. The number of households is 20,241
$47,734 Median household income with 23.5% poverty rate.
91.3% of residents have High school grad or higher and 19.6 have a batolorys degree or higher.