Illinois Department of Corrections
The Illinois Department of Corrections is the code department of the Illinois state government that operates the adult state prison system. The IDOC is led by a director appointed by the Governor of Illinois, and its headquarters are in Springfield.
The IDOC was established in 1970, combining the state's prisons, juvenile centers, and parole services. The juvenile corrections system was split off into the Illinois Department of Juvenile Justice on July 1, 2006.
Facilities
| Name | Highest security | Operational capacity |
| Menard Correctional Center | 1 – Maximum | 3,205 |
| Pontiac Correctional Center | 1 – Maximum | 1,492 |
| Stateville Correctional Center | 1 – Maximum | 1,648 |
| Northern Reception and Classification | 1 – Maximum | 1,625 |
| Dixon Correctional Center | 2 – Secure Medium 3 – High Medium 5 – High Minimum | 2,529 |
| Hill Correctional Center | 2 – Secure Medium | 1,867 |
| Lawrence Correctional Center | 2 – Secure Medium | 2,320 |
| Pinckneyville Correctional Center | 2 – Secure Medium | 2,274 |
| Western Illinois Correctional Center | 2 – Secure Medium | 1,871 |
| Big Muddy River Correctional Center | 3 – High Medium | 1,598 |
| Danville Correctional Center | 3 – High Medium | 1,864 |
| Illinois River Correctional Center | 3 – High Medium | 2,094 |
| Menard Medium Security Unit | 3 – High Medium | 441 |
| Pontiac Medium Security Unit | 3 – High Medium | 488 |
| Shawnee Correctional Center | 3 – High Medium | 2,147 |
| Centralia Correctional Center | 4 – Medium | 1,528 |
| Decatur Correctional Center | 4 – Medium | 790 |
| Graham Correctional Center | 4 – Medium | 2,012 |
| Lincoln Correctional Center | 4 – Medium | 1,019 |
| Logan Correctional Center | 4 – Medium | 2,019 |
| Sheridan Correctional Center | 4 – Medium | 2,104 |
| Jacksonville Correctional Center | 5 – High Minimum | 1,012 |
| Robinson Correctional Center | 5 – High Minimum | 1,223 |
| Taylorville Correctional Center | 5 – High Minimum | 1,221 |
| East Moline Correctional Center | 6 – Minimum | 1,228 |
| Southwestern Illinois Correctional Center | 6 – Minimum | 621 |
| Vandalia Correctional Center | 6 – Minimum | 1,700 |
| Vienna Correctional Center | 6 – Minimum | 1,616 |
| Clayton Work Camp | 7 – Low Minimum | 143 |
| Dixon Springs Impact Incarceration Program | 7 – Low Minimum | 152 |
| DuQuoin Impact Incarceration Program | 7 – Low Minimum | 172 |
| East Moline Work Camps 1 and 2 | 7 – Low Minimum | 184 |
| Greene County Work Camp | 7 – Low Minimum | 158 |
| Pittsfield Work Camp | 7 – Low Minimum | 267 |
| Southwestern Illinois Work Camp | 7 – Low Minimum | 100 |
| Stateville Minimum Security Unit | 7 – Low Minimum | 185 |
| Crossroads Adult Transition Center | 8 – Transitional | 364 |
| Fox Valley Adult Transition Center | 8 – Transitional | 130 |
| North Lawndale Adult Transition Center | 8 – Transitional | 200 |
| Peoria Adult Transition Center | 8 – Transitional | 248 |
Crossroads and North Lawndale Adult Transition Centers are operated by the Safer Foundation.
Closed prisons
- Alton Military Prison: open 1833 through 1857, replaced by Joliet; operated as a military prison during the Civil War
- Decatur Adult Transition Center; closed 2012
- Dwight Correctional Center: closed in 2013; maximum security
- Hardin County Work Camp; closed 2015; low minimum
- Jesse 'Ma' Houston Adult Transition Center: closed 2011; transitional facility
- Joliet Prison: closed in 2002; south of Stateville Correctional Center
- Kankakee Minimum-Security Unit; low minimum, closed 2010
- Southern Illinois Adult Transition Center; closed 2012
- Tamms Correctional Center: closed in 2013; maximum security
- Tamms Minimum Security Unit: Low Minimum
- Thomson Correctional Center, an ADX facility built in 2001 near Thomson, Illinois, was sold by the state to the federal government in 2012, and renamed the United States Penitentiary, Thomson .
Security levels
Security Levels: 1 – Maximum, 2 – Medium, 3 – Minimum, P – Pending
Offender Grades: A, B, C
Escape Level: ow, oderate, igh, xtremely High, ending
The offender classification is designated in the example below:
2 ; A ; L
Within the Medium and Minimum security levels there are multiple levels of security as shown in the list of facilities above. There are several factors which determine the level of security at a facility level. A table below will highlight some of the most important distinctions. An offender can be housed at a facility one level lower than his current security classification for a limited period of time if located in the Segregation Unit while a transfer is pending after reclassification.
Offender grades are part of the discipline system utilized within the facilities. Offenders are initially assigned to A grade and afforded all privileges. B grade is a transitional grade for offenders moving back to A grade after demotion to C grade. C grade restricts telephone usage, commissary purchases to cosmetic/legal items, and prohibits many work and school assignments.
The escape risk system utilizes a metric to indicate the likelihood that an offender would attempt escape. Several factors are used to determine this metric including but not limited to crime of conviction, criminal history, history of escape attempts, and outstanding warrants. An oddity within the Moderate Escape Risk designation should be noted. This escape level is used for two completely different purposes. In one case this level is assigned to offenders who would otherwise be a low risk when placed in a higher security facility. For example, Dixon Correctional Center houses the majority of offenders with serious health problems. Offenders serving long sentences who are moved to this Level 3 facility will usually be assigned the moderate escape risk level as part of the reclassification performed to assign an offender with medical problems to this facility where they would otherwise remain at Level 1/2. The other use for this escape level is where an offender has an outstanding warrant or has absconded from parole or work release during the last 24 months. Offender identification cards indicate the escape level by utilizing a color coded background. Low escape risks have a white background, moderate escape risks have a blue background, high escape risks have a red background, and extremely high escape risks have a green background. Additionally, extremely high escape risks wear a green shirt and have a green stripe down their pant legs.
Offenders with special security clearances, such as outside clearance, special assignment clearances, or multi-level facility indicators will have data on the back of their offender identification cards.
| Facility Level | Security Features | Eligible Security Classifications | Notes |
| 1 | Very Strong Perimeter, Majority of Offenders Housed in Cells, Guard Towers, Limited Movement No Day Room | All Levels, Grades, and Escape Risks | A limited group of offenders are granted OUTSIDE CLEARANCE to work outside the perimeter for certain tasks. These offenders must be designated 3AL and have an in depth security analysis performed to be eligible. Certain crimes would preclude an offender from ever attaining this designation. Stateville Correctional Center utilizes Stateville Minimum Security Unit attached to the Northern Reception and Classification Center on the Stateville Campus to house these offenders. Pontiac Correctional Center utilizes the Pontiac Medium Security Unit to house these offenders. Menard Correctional Center utilizes the Menard Medium Security Unit to house these offenders. |
| 2 | Very Strong Perimeter, Offenders Housed in Cells, Guard Towers, Escorted Controlled Movement Limited Day Room Time | Security Levels 2 and 3, All Grades, Escape Levels L, M, H | A limited group of offenders are granted OUTSIDE CLEARANCE to work outside the perimeter for certain tasks. These offenders must be designated 3AL and have an in depth security analysis performed to be eligible. Certain crimes would preclude an offender from ever attaining this designation. |
| 3 | Very Secure Perimeter, Offenders Housed in Cells, Guard Towers, Controlled Movement Day Room Time Day Room Time | Security Levels 2 and 3, All Grades, Escape Levels L, M | A limited group of offenders are granted OUTSIDE CLEARANCE to work outside the perimeter for certain tasks. These offenders must be designated 3AL and have an in depth security analysis performed to be eligible. Certain crimes would preclude an offender from ever attaining this designation. |
| 4 | Very Secure Perimeter, Offenders Housed in Cells, Guard Towers, Controlled Movement Day Room Time | Security Levels 2 and 3, All Grades, Escape Level L | A limited group of offenders are granted OUTSIDE CLEARANCE to work outside the perimeter for certain tasks. These offenders must be designated 3AL and have an in depth security analysis performed to be eligible. Certain crimes would preclude an offender from ever attaining this designation. |
| 5 | Secure Perimeter, Offenders Housed in Dorms, Guard Tower, Controlled Movement Day Room Time | Security Level 3, All Grades, Escape Level L | A limited group of offenders are granted OUTSIDE CLEARANCE to work outside the perimeter for certain tasks. These offenders must be designated 3AL and have an in depth security analysis performed to be eligible. Certain crimes would preclude an offender from ever attaining this designation. |
| 6 | Secure Perimeter, Offenders Housed in Dorms, Controlled Movement Day Room Time | Security Level 3, Grades A and B, Escape Level L | A limited group of offenders are granted OUTSIDE CLEARANCE to work outside the perimeter for certain tasks. These offenders must be designated 3AL and have an in depth security analysis performed to be eligible. Certain crimes would preclude an offender from ever attaining this designation. No sex offenders may be housed at this level. |
| 7 | Minimal Unlocked Perimeter, Offenders Housed in Dorms, Open Movement Day Room Time | Security Level 3, A Grade Only, Escape Level L | All offenders at this level would be considered as having OUTSIDE CLEARANCE as a matter of security designation and be allowed to work on supervised crews in the community. These offenders must be designated 3AL and have an in depth security analysis performed to be eligible. Certain crimes would preclude an offender from ever attaining this designation. This classification also applies to all offenders assigned to the Impact Incarceration Program. No sex offenders may be housed at this level. |
| 8 | No Perimeter, Offenders Housed in Dorms, Work Release Setting | Security Level 3, A Grade Only, Escape Level L | This designation is for work release transitional facilities. These offenders are integrated within the community in a highly controlled and supervised manner. This designation is similar to parole with the exception that periodic custody is still retained and the level of supervision is much higher. No sex offenders may be housed at this level. |
Death row
Illinois had the death penalty until it was abolished in 2011. Illinois's last execution was Andrew Kokoraleis, on March 17, 1999.Pontiac Correctional Center housed the male death row, while Dwight Correctional Center housed the female death row. Prior to the January 11, 2003 commutation of death row sentences, male death row offenders were housed at Pontiac, Menard, and Tamms correctional centers. The execution chamber was located at Tamms Correctional Center. Prior to the opening of Tamms Correctional Center's Closed Maximum Security Unit section in March 1998, executions were carried out at Stateville Correctional Center.