Illinois Prisons: Facilities, Sentencing Credits, and Visits

Illinois prisons are run by the Illinois Department of Corrections (IDOC), which operates roughly 44 adult facilities at every security level and held about 30,134 people as of November 30, 2025.¹ The system runs from maximum-security prisons like Stateville and Menard down to work camps and adult transition centers that prepare people for release, and almost everything you might need to do — locate someone, visit them, send mail or money, understand when they’ll come home — depends on which facility they’re assigned to.

What IDOC Is

IDOC is the executive agency responsible for all adult state prisons in Illinois. Its authority comes from 730 ILCS 5/3-2-2, which lets the department accept people committed by Illinois courts, maintain and build correctional facilities, run rehabilitation and employment programs, and supervise people in the community after release.² That last piece matters: people released from prison in Illinois are usually still in IDOC’s legal custody during their supervision term.³

Juveniles are handled separately. Young people convicted of offenses go to the Illinois Department of Juvenile Justice, a distinct agency established under 730 ILCS 5/3-2.5-1, and are housed in Illinois Youth Centers rather than adult prisons.⁴

How Many Prisons Illinois Has and How They Differ

As of 2026, IDOC’s roster includes four maximum-security prisons, roughly 13 medium-security facilities, about 17 minimum-security centers and work camps, five multi-security facilities, one secured inpatient mental health center, and four adult transition centers.⁵ The exact count moves as facilities open, close, or change designation. Total system capacity is around 35,800, so the current population sits under capacity rather than over it.¹

Everyone entering IDOC goes through a reception and classification center, where staff review court documents, criminal history, medical needs, and behavioral risk to assign a security score. IDOC says the intake period varies by individual, and privileges are limited while it’s happening.⁶ The score determines where someone is sent.

The tiers work about how you’d expect. Maximum-security facilities have double-fenced perimeters with electronic detection, armed towers, and controlled movement requiring staff escort. Medium-security sites use reinforced fencing and controlled movement but allow more access to programming. Minimum-security centers rely on dormitory housing with fewer physical barriers and focus on work assignments and release preparation. Multi-security facilities house people at different levels within the same campus under separate protocols.⁷ Classification isn’t permanent; behavior, program participation, and time served can lead to reclassification to a lower level and better conditions.

The Major Facilities by Name

Most Illinois prisons sit in rural areas where large tracts were available when they were built, and they often serve as major local employers. The maximum-security prisons are the names you’re most likely to run into:

Stateville Correctional Center, in Crest Hill near Joliet, is one of the state’s oldest and is currently slated for a complete rebuild.
Menard Correctional Center sits along the Mississippi River in Chester and is one of the largest facilities in the system.
Pontiac Correctional Center, in central Illinois, has historically housed high-security populations.
Illinois River Correctional Center in Canton also includes medium-security housing.

Medium-security facilities do most of the day-to-day work of the system and include Pinckneyville, Danville, Sheridan, Western Illinois (Mount Sterling), Hill (Galesburg), and Shawnee, among others. Minimum-security centers such as Vandalia, Taylorville, Jacksonville, and Vienna focus on work assignments and reentry. Work camps at Clayton, Greene County, Pittsfield, and Southwestern Illinois house people on labor details with minimal physical barriers.⁵

Women’s Facilities

Logan Correctional Center in Lincoln is the largest women’s prison in Illinois, classified as multi-security, and it also handles reception and classification for women entering the system through a separate intake unit. Decatur Correctional Center houses women at minimum security.⁵

Mental Health Facilities

The Joliet Treatment Center, opened in 2017, serves men with severe mental illness who need more intensive care than a general-population facility can provide. The Joliet Inpatient Treatment Center, opened in 2022, offers the most intensive level of care for both men and women with severe mental illness or long-term medical needs. Both are multi-security, multi-disciplinary facilities.⁵

Reentry and Transition Centers

Life Skills Re-Entry Centers such as Kewanee and Murphysboro work with people nearing release on employment training, financial literacy, and reintegration. Adult Transition Centers in Chicago (Crossroads and North Lawndale), Aurora (Fox Valley), and Peoria run at transitional security with a focus on work release and stable housing before people are fully out.⁵

How Long Someone Actually Serves

The number a judge announces at sentencing is rarely the number of days someone spends in prison. Illinois uses a layered system of sentence credits, and understanding them is often the first real question families ask.

Good Conduct Credit

For most offenses, an incarcerated person earns one day of credit for each day served, which makes them eligible for release at roughly the halfway point of the sentence.⁸ Credit can be lost for disciplinary violations.

Truth-in-Sentencing Limits

Certain serious offenses carry statutory limits on how much credit can be earned, and the sentencing judge has no discretion to override them:

100% offenses, including first-degree murder, terrorism, and natural life sentences, earn zero credit. The full sentence must be served.
85% offenses, including certain sexual assaults, kidnapping, and armed robbery, earn 4.5 days of credit per month, so at least 85% of the sentence is served.
75% offenses, certain drug-related crimes, earn 7.5 days per month. Programming credits can reduce the required portion to 60% in some cases, though not for gunrunning.

These caps are set by statute.⁸

Earned Discretionary and Programming Credits

On top of good conduct, the IDOC Director can award Earned Discretionary Sentence Credit (EDSC) for programming, work, or other rehabilitative activities. The cap is 180 days for sentences under five years and 360 days for sentences of five years or more.⁹ Eligibility depends on following an individualized case plan. People with court-ordered substance use or sex offender treatment recommendations generally cannot earn EDSC without completing that treatment.¹⁰

Full-time participation in substance abuse, educational, work-release, or reentry programming earns an extra day of credit for each day of participation. Self-improvement and volunteer activities earn up to half a day per day of participation. Educational milestones bring one-time awards: 90 days for a GED or high school equivalency, 120 days for an associate’s degree, and 180 days for a bachelor’s, master’s, or professional degree, so long as the person didn’t already hold that degree at intake.⁹

Release Doesn’t End IDOC Custody

Nearly everyone released from an Illinois prison enters Mandatory Supervised Release (MSR), which functions like parole. The Illinois Prisoner Review Board sets the conditions, and people on MSR remain in IDOC’s legal custody, meaning a violation can send them back to prison.¹¹ Standard conditions typically include regular check-ins with a parole agent, travel restrictions, a firearm ban, and requirements to maintain employment or programming. Conditions are set out at 730 ILCS 5/3-3-7, and violations are handled separately from any new criminal charges.³ The Board also hears petitions for early discharge from MSR for people with sustained compliance.

Finding Someone in Custody

IDOC runs a free Individual in Custody Search at idoc.illinois.gov. You can look someone up by name or IDOC number and the results show the assigned facility, projected release date, and other basic information.¹² Everything else that follows — visits, mail, deposits, calls — requires knowing the facility.

Visiting, Calling, and Sending Money

In-Person and Video Visits

To visit someone in an Illinois prison, you have to be on that person’s approved visitor list. The incarcerated person sets up the list; IDOC staff cannot verify whether you’re on it. Once you’re approved, visits must be scheduled online in advance. You’ll need two forms of ID, one a state-issued photo ID, and electronic devices, food, beverages, currency, and most personal items are prohibited.¹³

Video visits are scheduled through ICSolutions at least seven days ahead but no more than 30 days out. Incarcerated people can receive one video visit per day and two per week. Every video visit is monitored and recorded, and attorney-client privilege does not apply to them, so a confidential legal conversation cannot happen over video visit.¹³

Phone Calls and Electronic Messages

People in IDOC custody can make outgoing calls but cannot receive them. To get calls from someone inside, you need to be on their approved calling list, which they set up by request. You can fund calls through a prepaid ICSolutions account or by depositing money into the person’s trust account so they can buy phone minutes at commissary. Three-way calling is strictly prohibited and results in disciplinary action.¹⁴

Electronic messaging runs through ICSolutions’ Corrlinks system and is available at every IDOC facility except adult transition centers. All messages are screened and monitored, and IDOC has enabled a feature that delays both outgoing and incoming messages. Traditional mail is accepted at any time; put the person’s IDOC number near their name on the envelope to avoid processing delays.¹⁴

Depositing Money

Money can go into an incarcerated person’s trust account through JPAY, MoneyGram (up to $3,000 per transaction), or Send2Corrections (Western Union), with an overall cap of $5,000 per electronic transfer. Money orders up to $999.99 are also accepted, made payable to JPAY and sent with a deposit slip to their processing center. JPAY and Western Union deposits typically reach the account within 24 to 48 business hours; MoneyGram takes 72 to 96 hours.¹⁵ IDOC no longer uses GTL (ConnectNetwork/ViaPath) for deposits, so older instructions pointing there are out of date.

Filing a Grievance

Incarcerated people in Illinois have a formal grievance process for conditions of confinement, staff conduct, medical care, and similar issues. Under 20 Ill. Admin. Code 504.830, a grievance officer must review the complaint and report written findings and recommendations to the facility’s chief administrative officer within two months, when feasible.¹⁶ The chief administrative officer then issues a written decision. Grievances involving disability accommodation go to the facility’s ADA coordinator, and medical privacy complaints go to the privacy officer.

Grievances can be denied without investigation if they raise issues already addressed, don’t personally affect the person filing, were filed late without good cause, or challenge decisions already made by the IDOC Director. Working the grievance process through to the end matters beyond its internal function, because exhausting administrative remedies is generally a prerequisite before an incarcerated person can bring a federal civil rights lawsuit over the same issue.

1
Illinois Department of Corrections. IDOC Quarterly Report, January 2026
2
Illinois General Assembly. Illinois Code 730 ILCS 5/3-2-2 – Powers and Duties of the Department
3
Illinois Department of Corrections. Conditions of Parole
4
Illinois General Assembly. Illinois Code 730 ILCS 5 – Unified Code of Corrections, Article 2.5
5
Illinois Department of Corrections. Facilities
6
Illinois Department of Corrections. Northern Reception and Classification Center
7
Illinois Department of Corrections. Administrative Directive 05.05.105 – Individual in Custody Classification Process
8
Illinois General Assembly. Illinois Code 730 ILCS 5/3-6-3 – Rules and Regulations for Sentence Credit
9
Illinois Sentencing Policy Advisory Council. Sentence Credits 101
10
Illinois Department of Corrections. Earned Discretionary Sentence Credit
11
Illinois Prisoner Review Board. Illinois Prisoner Review Board
12
Illinois Department of Corrections. Illinois Department of Corrections
13
Illinois Department of Corrections. Visitation Rules and Information
14
Illinois Department of Corrections. Contact an Individual in Custody
15
Illinois Department of Corrections. Individual in Custody Deposit Services
16
Legal Information Institute. Illinois Administrative Code Title 20, Section 504.830 – Grievance Procedures