Jails and Prisons in Illinois
| Facility | City |
|---|---|
| Witt Police Jail | Witt IL |
| Wonder Lake Police Jail | Wonder Lake IL |
| Wood County Jail | Marion IL |
| Wood Dale Police Jail | Wood Dale IL |
| Wood River Police Jail | Wood River IL |
| Woodhull Police Jail | Woodhull IL |
| Woodland Police Jail | Woodland IL |
| Woodridge Police Jail | Woodridge IL |
| Woodson Police Jail | Woodson IL |
| Woodstock Police Jail | Woodstock IL |
| Worth County Jail | Rockford IL |
| Worth Police Jail | Worth IL |
| Wyanet Police Jail | Wyanet IL |
| Wyoming Police Jail | Wyoming IL |
| Xenia Police Jail | Xenia IL |
| Yankton County Jail | Eureka IL |
| Yates City Police Jail | Yates City IL |
| Yorkville Police Jail | Yorkville IL |
| Zeigler Police Jail | Zeigler IL |
| Zion Police Jail | Zion IL |