Cook County, IL

Mandatory Supervised Release ("Parole")

Once an individual sentenced to prison serves their prison sentence, upon release they are supervised in the community under Mandatory Supervised Release (MSR, “Parole”) by parole agents who work for the Illinois Department of Corrections. The length of time individuals are supervised on MRS is set by state statute and corresponds to the felony class of the crime for which they were sentenced to prison, generally ranging from six months (for most Class 3 and 4 Felonies) to 3 years (for Murder). For individuals convicted of some sex offenses, their MSR period is indeterminate, with a minimum of 3 years and up to lifetime supervision. Those sentenced to prison for domestic violence offenses are supervised on MSR for 4 years. Individuals under MSR supervision must follow specific rules and conditions, which can include not possessing firearms or narcotics, reporting to a parole agent, allowing home and work visits by parole officers, and obtaining permission for certain actions like leaving the state or changing residence or job. Upon successful completion of MSR, the individual is no longer under supervision.


Information on MSR populations comes from the Illinois Department of Corrections public data portal. Data on this site are based on the most detailed information available at the time of publication and are intended to show general patterns in the number of individuals supervised on MSR in Cook County. For more details on the data, read our Glossary.

MSR (Parole) Population

The number of people on MSR (parole) in Cook County may vary, depending on changes in the number and nature of crimes for which people are convicted, the number and lengths of prison sentences imposed, and the length of parole supervision. This section shows data on people on MSR in Cook County.

MSR (Parole) Population by Offense Level