
The Illinois Department of Corrections (IDOC) 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 Metropolitan Correctional Center, Chicago is a United States federal prison in Chicago, Illinois, which holds male and female prisoners of all security levels prior to and during court proceedings in the Northern District of Illinois, as well as inmates serving brief sentences. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice.

The Federal Correctional Institution Greenville is a medium-security United States federal prison for male offenders in Illinois, with an adjacent satellite prison camp for minimum-security female offenders. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice.

Joliet Correctional Center was a prison in Joliet, Illinois, United States, from 1858 to 2002. It is featured in the motion picture The Blues Brothers as the prison from which Jake Blues is released at the beginning of the movie. It is also used for the exterior shots of the Illinois "state prison" in the James Cagney film White Heat, and the location for first season of Fox Network's Prison Break television show, and the movie Let's Go to Prison. In 2018, it opened for tours.

Menard Correctional Center, known prior to 1970 as Southern Illinois Penitentiary, is an Illinois state prison located in the town of Chester in Randolph County, Illinois. It houses maximum-security and high medium-security adult males. The average daily population as of 2007 is 3,410.

The Federal Correctional Institution, Pekin is a medium-security United States federal prison for male inmates in Illinois. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. The facility also has an adjacent satellite prison camp which houses minimum-security female offenders.
Stateville Correctional Center (SCC) is a maximum security state prison for men in Crest Hill, Illinois, United States, near Chicago. It is a part of the Illinois Department of Corrections.

The United States Penitentiary, Marion is a medium-security United States federal prison for male inmates in unincorporated Williamson County, Illinois. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. The facility also has an adjacent satellite prison camp that houses minimum security male offenders.

The United States Penitentiary, Thomson, formerly Thomson Correctional Center, is a high-security federal prison located in Thomson, Illinois. It has an area of about 146 acres (59 ha) and comprises 15 buildings. The facility is enclosed by a 15-foot (4.6 m), 7000 volt electric fence surrounded by an additional 12-foot (3.7 m) exterior fence covered with razor wire. Thomson has eight cellhouses with a rated capacity of 2,100 beds—1,900 high-security SMU beds and 200 minimum-security beds at the onsite camp—and according to BOP officials, the potential to use some of its high-security rated capacity to house up to 400 ADX inmates. From its completion in 2001 to 2006, it remained empty. By 2009, only the minimum-security section housed prisoners.