Plainfield Township is located in Will County, Illinois. As of the 2010 census, its population was 80,318 and it contained 25,333 housing units. Plainfield Township government serves the residents in the Illinois communities of Plainfield, Joliet, Romeoville and Crest Hill. Plainfield Township's boundaries run to the North by 135th Street, to the South by Theodore Street, to the East by Gaylord Road and to the West by County Line Road.
See also Plainfield Public Library District
According to the 2010 census, the township has a total area of 35.24 square miles (91.3 km2), of which 33.48 square miles (86.7 km2) (or 95.01%) is land and 1.76 square miles (4.6 km2) (or 4.99%) is water.