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Illinois has an incarceration rate of 497 per 100,000 people (including prisons, jails, immigration detention, and juvenile justice facilities), meaning that it locks up a higher percentage of its people than almost any democracy on earth. Read on to learn more about who is incarcerated in Illinois and why.

Jump to COVID-19 data.


76,000 people from Illinois are behind bars

Pie chart showing that 76,000 Illinois residents are locked up in federal prisons, state prisons, local jails and other types of facilities

Additionally, the number of people impacted by county and city jails in Illinois is much larger than the graph above would suggest, because people cycle through local jails relatively quickly. Each year, at least 173,000 different people are booked into local jails in Illinois.


Rates of imprisonment have grown dramatically in the last 40 years

graph showing the number of people in state prison and local jails per 100,000 residents in Illinois from 1978 to 2015 Also see these Illinois graphs:


Graph showing the number of people in Illinois jails who were convicted and the number who were unconvicted, for the years 1978, 1983, 1988, 1993, 1999, 2005, and 2013.


Today, Illinois’s incarceration rates stand out internationally

graphic comparing the incarceration rates of the founding NATO members with the incarceration rates of the United States and the state of Illinois. The incarceration rate of 664 per 100,000 for the United States and 497 for Illinois is much higher than any of the founding NATO membersIn the U.S., incarceration extends beyond prisons and local jails to include other systems of confinement. The U.S. and state incarceration rates in this graph include people held by these other parts of the justice system, so they may be slightly higher than the commonly reported incarceration rates that only include prisons and jails. Details on the data are available in States of Incarceration: The Global Context. We also have a version of this graph focusing on the incarceration of women.


People of color are overrepresented in prisons and jails

2010 graph showing incarceration rates per 100,000 people of various racial and ethnic groups in Illinois

racial and ethnic disparities between the prison/jail and general population in IL as of 2010

See also our detailed graphs about Whites and Blacks in Illinois prisons and jails.


Illinois's criminal justice system is more than just its prisons and jails

Pie chart showing that 216,000 Illinois residents are in various types of correctional facilities or under criminal justice supervision on probation or parole


Data on COVID-19 in Illinois jails and prisons

We gave Illinois a "D" grade in September 2021 for its response to the coronavirus in prisons, noting that:

  • We estimate that prisons and jails led to an additional 47,298 COVID-19 cases in Illinois in the summer of 2020 alone.
  • Illinois failed to utilize one of the most obvious, and easiest, tools for reducing the prison population — stopping prison admissions for technical violations of probation and parole (which are not crimes).

For more detail, see our report States of Emergency. Or check out these other resources:


Our other articles about Illinois


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