Joliet Township is located in Will County, Illinois. As of the 2010 census, its population was 87,398 and it contained 32,617 housing units.
According to the 2010 census, the township has a total area of , of which (or 97.67%) is land and (or 2.33%) is water.
The segment containing Chicagoland Speedway was ceded to Jackson Township at an unknown date after 1999 for unknown reasons.