| Adams County Jail | Quincy | County jail |
| Adams County Juvenile Detention Center | Quincy | Juvenile detention |
| Big Muddy River Correctional Center | Ina | IDOC state prison |
| Bond County Jail | Greenville | County jail |
| Boone County Correctional Facility | Belvidere | County jail |
| Broadview ICE Facility | Broadview | ICE processing/holding site |
| Bureau County Jail | Princeton | County jail |
| Calhoun County Jail/detention facility | Hardin | Very short-term county holding |
| Carroll County Correctional Facility | Mount Carroll | County jail |
| Centralia Correctional Center | Centralia/Shattuc, Clinton County | IDOC medium-security prison |
| Champaign County Jail | Urbana | County jail |
| Champaign County Juvenile Detention Center | Urbana | Juvenile detention |
| Christian County Correctional Center | Taylorville | County jail |
| Clark County Jail | Marshall | County jail |
| Clay County Jail | Louisville | County jail |
| Clayton Work Camp | Clayton | IDOC work camp/satellite |
| Clinton County Jail | Carlyle | County jail |
| Coles County Jail | Charleston | County jail |
| Cook County Jail | Chicago | County jail complex |
| Cook County Juvenile Temporary Detention Center | Chicago | Juvenile detention |
| Crawford County Jail | Robinson | County jail |
| Crossroads Adult Transition Center | Chicago | IDOC adult transition center |
| Cumberland County Jail | Toledo | County jail |
| Danville Correctional Center | Danville | IDOC state prison |
| Decatur Correctional Center | Decatur | IDOC state prison |
| DeKalb County Jail | Sycamore | County jail |
| DeWitt County Jail | Clinton | County jail |
| Dixon Correctional Center | Dixon | IDOC state prison |
| Dixon Springs Impact Program | Pope County | Specialized IDOC impact-program custody site |
| Douglas County Jail | Tuscola | County jail |
| Downtown Correctional Center | Urbana | Former/secondary county jail building |
| Du Quoin Impact Program | Perry County | Specialized IDOC impact-program custody site |
| DuPage County Correctional Facility | Wheaton | County jail |
| Dwight Correctional Center (closed 2013) | Dwight area | Former IDOC prison |
| East Moline Correctional Center | East Moline | IDOC state prison |
| Edgar County Jail | Paris | County jail |
| Edwards County Sheriff holding cell | Albion | Temporary county holding/no jail |
| Effingham County Jail | Effingham | County jail |
| Fayette County Jail | Vandalia | County jail |
| FCI Greenville and satellite camp | Greenville | Federal BOP prison/camp |
| FCI Marion | Marion | Federal BOP prison |
| FCI Pekin and satellite camp | Pekin | Federal BOP prison/camp |
| FCI Thomson | Thomson | Federal BOP prison |
| Ford County Jail | Paxton | County jail |
| Fox Valley Adult Transition Center | Aurora | IDOC adult transition center |
| Franklin County Jail | Benton | County jail |
| Franklin County Juvenile Detention Center | Benton | Juvenile detention |
| Fulton County Jail | Lewistown | County jail |
| Graham Correctional Center | Hillsboro | IDOC prison/reception component |
| Greene County Jail | Carrollton | County jail |
| Greene County Work Camp | Roodhouse | County work camp/program facility |
| Grundy County Jail | Morris | County jail |
| Hancock County Jail | Carthage | County jail |
| Hardin County Jail | Elizabethtown | County jail/limited operation |
| Henderson County Jail | Oquawka | County jail |
| Henry County Jail | Cambridge | County jail |
| Hill Correctional Center | Galesburg, Knox County | IDOC medium-security prison |
| Illinois River Correctional Center | Canton | IDOC state prison |
| Iroquois County Jail | Watseka | County jail |
| Jackson County Jail | Murphysboro | County jail |
| Jacksonville Correctional Center | Jacksonville | IDOC state prison |
| Jasper County Jail | Newton | County jail |
| Jefferson County Justice Center | Mount Vernon | County jail |
| Jerome Combs Detention Center | Kankakee | County jail |
| Jersey County Jail | Jerseyville | County jail |
| Jo Daviess County Jail | Galena | County jail |
| Joliet Inpatient Treatment Center | Will County | Specialized IDOC inpatient treatment unit |
| Joliet Treatment Center | Joliet, Will County | IDOC multidisciplinary treatment facility |
| Kane County Adult Justice Center | St. Charles | County jail |
| Kane County Juvenile Justice Center | St. Charles | Juvenile detention |
| Kankakee County Jail/Detention Center (old jail) | Kankakee | County detention building |
| Kendall County Public Safety Center | Yorkville | County jail |
| Kewanee Life Skills Re-Entry Center | Kewanee | IDOC reentry prison |
| Knox County Jail | Galesburg | County jail |
| Lake County Adult Corrections Facility | Waukegan | County jail |
| Lake County Community Based Corrections Center | Waukegan | County community corrections |
| LaSalle County Jail | Ottawa | County jail |
| Lawrence Correctional Center | Sumner | IDOC state prison |
| Lawrence County Jail | Lawrenceville | County jail |
| Lee County Jail | Dixon | County jail |
| Lincoln Correctional Center | Lincoln | IDOC state prison |
| Livingston County Jail | Pontiac | County jail |
| Logan Correctional Center | Lincoln | IDOC state prison |
| Logan County Safety Complex | Lincoln | County jail |
| Macon County Jail | Decatur | County jail |
| Macoupin County Jail | Carlinville | County jail |
| Madison County Jail | Edwardsville | County jail |
| Madison County Juvenile Detention Home | Edwardsville | Juvenile detention |
| Marion County Jail | Salem | County jail |
| Marshall County Jail | Lacon | County jail |
| Mary Davis Detention Home | Galesburg | Juvenile detention serving Fulton region |
| Mason County Jail | Havana | County jail |
| Massac County Jail | Metropolis | County jail |
| McDonough County Jail | Macomb | County jail |
| McHenry County Correctional Facility | Woodstock | County jail |
| McLean County Detention Facility | Bloomington | County jail |
| McLean County Juvenile Detention Center | Normal/Bloomington | Juvenile detention |
| Menard Correctional Center | Chester | IDOC state prison |
| Menard County Detention Facility | Petersburg | County jail |
| Menard Medium Security Unit | Chester | IDOC prison unit |
| Menard Reception and Classification Center | Chester | IDOC reception unit |
| Mercer County Jail | Aledo | County jail |
| Metropolitan Correctional Center Chicago | Chicago | Federal BOP detention center |
| Monroe County Jail | Waterloo | County jail |
| Montgomery County Jail | Hillsboro | County jail |
| Morgan County Jail | Jacksonville | County jail |
| Moultrie County Jail | Sullivan | County jail |
| Murphysboro Life Skills Re-Entry Center | Murphysboro, Jackson County | IDOC minimum-security reentry center |
| North Lawndale Adult Transition Center | Chicago | IDOC adult transition center |
| Northern Reception and Classification Center | Crest Hill/Joliet | IDOC reception center |
| Ogle County Jail | Oregon | County jail |
| Peoria Adult Transition Center | Peoria | IDOC adult transition center |
| Peoria County Jail | Peoria | County jail |
| Peoria County Juvenile Detention Center | Peoria | Juvenile detention |
| Perry County Jail | Pinckneyville | County jail |
| Piatt County Jail | Monticello | County jail |
| Pike County Jail | Pittsfield | County jail |
| Pinckneyville Correctional Center | Pinckneyville | IDOC state prison |
| Pittsfield Work Camp | Pittsfield | Work camp |
| Pontiac Correctional Center | Pontiac | IDOC state prison |
| Pontiac Medium Security Unit | Pontiac | IDOC unit |
| Pulaski County Detention Center (historically Tri-County) | Ullin | County/regional contract jail |
| Putnam County Jail | Hennepin | County jail/limited status |
| Randolph County Jail | Chester | County jail |
| Richland County Detention Center | Olney | County jail |
| River Valley Juvenile Detention Center | Joliet | Regional juvenile detention |
| Robinson Correctional Center | Robinson | IDOC state prison |
| Rock Island County Correctional Center | Rock Island | County jail |
| Rock Island County Juvenile Justice Center | Rock Island | Juvenile detention |
| Saline County Jail/Detention Center | Harrisburg | County jail |
| Sangamon County Jail | Springfield | County jail |
| Sangamon County Juvenile Detention Center | Springfield | Juvenile detention |
| Schuyler County Jail | Rushville | County jail |
| Shawnee Correctional Center | Vienna | IDOC state prison |
| Shelby County Jail | Shelbyville | County jail |
| Sheridan Correctional Center | Sheridan | IDOC state prison |
| Southwestern Illinois Correctional Center | East St. Louis | IDOC state prison |
| Southwestern Illinois Work Camp | East St. Louis | IDOC work camp |
| St. Clair County Jail | Belleville | County jail |
| St. Clair County Juvenile Detention Center | Belleville | Juvenile detention |
| Stark County Jail | Toulon | Local jail/limited or off-site arrangement |
| Stateville Correctional Center | Crest Hill | IDOC prison; current status is time-sensitive |
| Stateville Minimum Security Unit | Joliet/Crest Hill, Will County | IDOC minimum-security unit |
| Stephenson County Jail | Freeport | County jail |
| Tamms Correctional Center (closed 2013) | Tamms | Former IDOC prison |
| Taylorville Correctional Center | Taylorville | IDOC state prison |
| Tazewell County Jail | Pekin | County jail |
| Vandalia Correctional Center | Vandalia | IDOC state prison |
| Vermilion County Jail | Danville | County jail |
| Vermilion County Juvenile Detention Center | Danville | Juvenile detention |
| Vienna Correctional Center | Vienna | IDOC state prison |
| Wabash County Jail | Mount Carmel | County jail |
| Warren County Jail | Monmouth | County jail |
| Washington County Jail | Nashville | County jail |
| Wayne County Jail | Fairfield | County jail |
| Western Illinois Correctional Center | Mount Sterling | IDOC state prison |
| White County Jail | Carmi | County jail |
| Whiteside County Jail | Morrison | County jail |
| Will County Adult Detention Facility | Joliet | County jail |
| Williamson County Jail | Marion | County jail |
| Winnebago County Jail | Rockford | County jail |
| Winnebago County Juvenile Detention Center | Rockford | Juvenile detention |
| Woodford County Correctional Facility | Eureka | County jail |
