Fondulac Township is located in Tazewell County, Illinois. As of the 2010 census, its population was 13,381 and it contained 6,099 housing units.
According to the 2010 census, the township has a total area of , of which (or 82.71%) is land and (or 17.29%) is water.
According to the township's official figures from the 2020 Census, the population declined to 12,489, a decrease of 892 people (âÂÂ6.67%) from 2010. The 2020 population yields a population density of roughly 706 persons per square mile.
The community is predominantly White. Recent estimates place the racial and ethnic composition at roughly 92âÂÂ93% White, with smaller shares of Black or African American, Asian, American Indian/Alaska Native, people of two or more races, and a Hispanic or Latino population of around 3%.