| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Plainfield Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Will |
| Leader Title: | Supervisor |
| Leader Name: | Tony Fremarek |
| Established Title: | Established |
| Established Date: | November 6, 1849 |
| Area Total Sq Mi: | 35.24 |
| Area Land Sq Mi: | 33.48 |
| Area Water Sq Mi: | 1.76 |
| Area Water Percent: | 4.99 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 2398.9 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Website: | Plainfield Township |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 82021 |
| Blank Name: | FIPS code |
| Blank Info: | 17-197-60300 |
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.[2] 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, of which (or 95.01%) is land and (or 4.99%) is water.[2]