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Illinois 2020

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The Jail System

Illinois has 92 jails in 102 counties. The jail population in 2020 was 19,110.

The Prison System

As of December 31, 2020, the number of prisoners under the jurisdiction of the State of Illinois correctional authorities was 29,729 located in 28 state prisons and held in the custody of private prisons or local jails. Illinois operated facilities with a budget of $1,192,960,894.

The Community Corrections System

As of December 31, 2020, Illinois community corrections population was 88,894 under probation and 24,744 under parole.


The National Institute of Corrections depends on publicly available information to provide the information on this page.

The statistics for budgets, employee positions, and state prison facilities data come from state departments of corrections, other state reports and state agencies. If data is missing for a state, then we were unable to find that information.

The data on prison population and incarcerate rate come from the Prisoners in 2020 report released by the Bureau of Justice Statistics (BJS). The report includes the count of prisoners in the unified systems of Alaska, Connecticut, Delaware, Hawaii, Rhode Island, and Vermont.

Violent and property crime rates are provided by the Federal Bureau of Investigations.

The number of counties per state comes from the United States Census Bureau.

Rates (Per 100K)

Incarceration Rate


Prison Population
Parole Population
Probation Population


Number of State Prison Facilities
28 facilities
Number of Jail Facilities


Prison Budget