How to Become a Correctional Officer in Illinois

By Frarenz CarpioUpdated May 20, 2026

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Unlike many corrections jobs across the country where you pay for your own training, Illinois hires you first and pays you to train. New Correctional Officer Trainees (COTs) with the Illinois Department of Corrections (IDOC) earn $58,176 per year starting on day one of training and move up to $62,520 as Correctional Officers after the three-month trainee period. Training runs eight weeks total: two weeks at your assigned facility followed by six weeks at the Macon County Law Enforcement Training Center in Decatur. The minimum age to apply for IDOC is 18, but other Illinois corrections employers, including the Cook County Sheriff's Office, require you to be at least 21. Below is the verified, step-by-step path, plus the five different ways to enter Illinois corrections so you can choose the path that fits your situation.

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Key Points

IDOC Correctional Officer Trainees earn $58,176 per year on day one of training, then $62,520 as Correctional Officers after the three-month trainee period
The minimum age to apply for IDOC is 18, while Cook County Sheriff and federal corrections roles require you to be at least 21
Training takes eight weeks total: two weeks at your parent facility plus six weeks of 320-hour Pre-Service Security Training in Decatur
Illinois pays correctional officers a median annual wage of $78,750, which is about $20,800 above the national median of $57,950 (BLS, May 2024)
Five employers hire correctional officers in Illinois: IDOC, Cook County Sheriff's Office, suburban county sheriff's offices, the Federal Bureau of Prisons, and IDOC's Corrections Treatment Officer track

What a Correctional Officer Does in Illinois

Correctional officers in Illinois supervise people held in state prisons, county jails, and federal facilities. Day to day, the work involves controlling movement on housing units, conducting cell and area searches for contraband, writing incident reports, responding to medical or behavioral emergencies, and enforcing facility rules.

Illinois officers fall into three broad employer groups. IDOC officers work in state correctional centers and life skills re-entry centers under the Illinois Department of Corrections. County sheriff officers work in county jails and operate under local sheriff's offices, with Cook County being the largest by volume. Federal officers work at facilities operated by the Federal Bureau of Prisons, including the Metropolitan Correctional Center in Chicago and the federal prison at Thomson.

The role is a sworn peace officer position under Illinois law, which means the background, conduct, and truthfulness standards in the application process are stricter than for most other public sector jobs.

How to Become a Correctional Officer in Illinois

The path below covers the IDOC route, the most common entry point for state-level corrections work. County sheriff and federal paths follow a similar shape but with their own application portals and age rules, covered in the five-pathways section further down.

Step 1: Confirm You Meet the Minimum Qualifications

IDOC requires every Correctional Officer Trainee applicant to meet a fixed set of eligibility criteria. Per IDOC's published screening requirements, applicants must:

Be at least 18 years of age
Hold a high school diploma or GED certificate
Be a U.S. citizen or lawful permanent resident
Hold a valid driver's license
Be able to speak, read, and write English

According to IDOC administrative directive 302105 on Correctional Officer Trainee qualifications, a felony conviction, a misdemeanor crime of domestic violence, or a dishonorable discharge from the U.S. Armed Forces can disqualify an applicant. Other Illinois corrections employers have higher minimums. Cook County Sheriff's Office requires applicants to be at least 21 before the Merit Board reviews their file.

Step 2: Submit the IDOC Applicant Data Form

Apply online through the IDOC Applicant Data Form. Submitting multiple applications can delay scheduling, so submit once and wait for the screening notice. IDOC typically hosts one regional screening event per month, and after you apply, the central screening office will email you with the next available date.

Step 3: Pass the 4-Part Screening Event

Illinois corrections screening events run four assessments back to back. You bring the required documents (DOC 0737 employment application, photo ID, driver's license, transcripts or diploma, and military separation documents if applicable) and complete the following:

Test of Adult Basic Education (TABE): reading comprehension and vocabulary, scored at a minimum 10th-grade reading level. Applicants who submit transcripts verifying 15 or more college credit hours are exempt
Physical Agility Test: pass/fail, four exercises designed around real job demands, including the Queens College Step Test for cardiovascular endurance
Observation Exam: you watch a scripted incident, take notes for three minutes, then complete a multiple-choice exam in five minutes that measures how accurately you observed and interpreted the scenario
Structured Oral Rutan Interview and Writing Sample: two screeners interview you using a standardized questionnaire and rate you independently, scored 0 to 100 points

Pass all four components and you are placed on a ranked eligibility list. Hiring draws from this list based on score and facility need.

Step 4: Complete the Background Investigation and Medical Exam

Before a job offer, IDOC runs a background check through the Law Enforcement Agencies Data System (LEADS), which pulls criminal history, NCIC hot files, and Secretary of State driving records. Selected applicants also undergo a drug test, employment reference verification, and a full medical and vision exam.

Step 5: Finish the 8-Week Training Academy and 4.5-Month Probation

Once hired, you start as a paid Correctional Officer Trainee at $58,176 per year. Training has two parts. The first two weeks are spent at your parent facility for orientation, CPR and First Aid, online modules, and professionalism training. Weeks three through eight move to the Decatur academy for the 320-hour Pre-Service Security curriculum, which covers control tactics, firearms, use and application of restraints, report writing, the Prison Rape Elimination Act, and reality-based scenarios in the academy's VIrTra simulator and mock cells.

After graduation, your salary increases to $62,520 as a Correctional Officer. You then complete a four-and-a-half-month probationary period at your assigned facility before becoming a certified Illinois Correctional Officer.

Correctional Officer Salary in Illinois

Illinois correctional officers and jailers earn a median annual wage of $78,750, or $37.86 per hour (BLS OEWS, May 2024). That figure sits roughly $20,800 above the national median of $57,950 and places Illinois among the higher-paying states for the occupation.

For new IDOC hires, the published 2025 pay scale is:

$58,176 per year as a Correctional Officer Trainee (months 1 to 3, including the training academy)
$62,520 per year as a Correctional Officer after the trainee period
Certification awarded after a four-and-a-half-month probationary period at the assigned facility

The Corrections Treatment Officer Trainee role, a separate track that requires a bachelor's degree, starts at $65,004 and moves to $71,868 after four months.

Nationally, BLS projects employment for correctional officers and bailiffs to decline 7% between 2024 and 2034. That national figure does not always match what is happening at the state level. In January 2025, IDOC announced new regional academy partnerships with John A. Logan Community College in Carterville and Elementary School District 54 in Morris, projecting an increase in training class capacity of up to 300% to address current staffing needs.

If you are weighing this against other criminal justice paths, Dreambound lets you compare criminal justice and corrections-adjacent programs by length, format, and cost.

The 5 Ways to Become a Correctional Officer in Illinois

Most pages cover only the IDOC route. Illinois actually has five distinct corrections hiring tracks, each with its own age rule, training length, and starting pay. Knowing which one fits your situation can save months.

1. Illinois Department of Corrections (IDOC) Correctional Officer

Minimum age: 18
Training: 8 weeks (2 at the parent facility, 6 in Decatur), paid
Starting pay: $58,176 trainee, $62,520 after 3 months
Where you work: 30+ state correctional centers across Illinois

This is the lowest age threshold and the only Illinois path that pays you from day one of training.

2. Cook County Sheriff's Office Correctional Officer

Minimum age: 21 (applications accepted at 20)
Training: ILETSB-certified basic corrections academy
Where you work: Cook County Jail in Chicago

The Cook County Sheriff hires through the Sheriff's Merit Board and requires applicants to be U.S. citizens with a valid high school diploma or GED. Lateral transfers with existing ILETSB or law enforcement certification may qualify under reciprocity rules.

3. Suburban County Sheriff's Office Correctional Officer

Minimum age: 21 in most counties
Training: 200-hour basic corrections academy under ILETSB, plus agency-specific Field Training (FTO)
Where you work: county jails in Lake, Will, DuPage, McHenry, Kane, and other suburban counties

Each county runs its own hiring cycle and physical agility standards. Lake County, for example, adds a 15-hour advanced training block and a one-week Direct Supervision class on top of the basic academy.

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4. Federal Bureau of Prisons (BOP) Correctional Officer

Minimum age: federal law enforcement age rules apply (see USAJobs for current limits)
Training: Introduction to Correctional Techniques at the Federal Law Enforcement Training Center in Glynco, Georgia
Where you work: Metropolitan Correctional Center Chicago, USP Thomson, and other federal facilities

Federal BOP applications go through USAJobs. Pay grade typically starts at GS-5 or GS-6, with locality pay adjustments for Chicago.

5. IDOC Corrections Treatment Officer (CTOT) Trainee

Minimum age: 21
Training: 8 weeks at Decatur (paid)
Starting pay: $65,004 trainee, $71,868 after the four-month trainee period
Where you work: Joliet only (the position is offered solely at the Joliet Treatment Center)

This track requires a bachelor's degree in criminal justice, psychology, social work, or a closely related field, or a bachelor's degree plus one year of mental health service experience and one year of corrections experience.

Can You Become a Correctional Officer in Illinois with a Felony?

A felony conviction is a disqualifier for IDOC Correctional Officer Trainee positions. Per IDOC's published qualifications, applicants who have been convicted of a felony, a misdemeanor crime of domestic violence, or who received a dishonorable discharge from the U.S. Armed Forces are not eligible for hire.

County sheriff and federal corrections employers apply similar disqualifiers, and both run their own criminal history checks. Cook County's Merit Board, for example, lists untruthfulness or concealment of relevant facts on the application as separate grounds for disqualification.

Expunged or sealed records can sometimes still surface in a LEADS or NCIC check, so applicants with any criminal history should review their record with an Illinois attorney before applying. Some related fields, such as private security or community corrections support roles, may have less restrictive standards depending on the conviction and the time elapsed.

Career Paths After Becoming a Correctional Officer in Illinois

Becoming a certified officer is the entry point, and Illinois offers a few defined advancement tracks.

Rank promotion within the facility. With a strong record and time in grade, officers advance to Sergeant, Lieutenant, and Captain. Each rank carries supervisory responsibility for a shift, housing unit, or full facility operation.

Specialized assignments. Tactical response, K-9 handling, hostage negotiation, training instruction, and crisis intervention are positions IDOC and county agencies fill from within. These usually require time as a certified officer plus additional unit-specific training.

Corrections Treatment Officer or Parole Agent. A bachelor's degree opens the CTOT path covered above, or the parole agent path through IDOC's separate 10-week pre-service course for community supervision officers.

Transfer to other law enforcement. ILETSB-certified time in corrections can count toward reciprocity at police departments or other federal law enforcement agencies, subject to that agency's standards.

Frequently Asked Questions

How long is correctional officer training in Illinois?

IDOC Correctional Officer training takes eight weeks total. The first two weeks are at your parent facility for orientation, CPR and First Aid, and online modules. Weeks three through eight are spent at the Macon County Law Enforcement Training Center in Decatur, where cadets complete a 320-hour Pre-Service Security curriculum that covers control tactics, firearms, restraints, and reality-based simulation training. Full certification follows a four-and-a-half-month probationary period at your assigned facility.

What is the minimum degree a correctional officer has to have?

A high school diploma or GED is the minimum educational requirement for an IDOC Correctional Officer Trainee. No college degree is required for the standard officer track. The higher-paying Corrections Treatment Officer Trainee role requires a bachelor's degree in criminal justice, psychology, social work, or a related field, or a bachelor's degree plus one year of mental health service experience and one year of corrections experience.

How much do correctional officers make in Illinois?

Illinois correctional officers and jailers earn a median annual wage of $78,750, or $37.86 per hour, according to BLS OEWS data from May 2024. New IDOC hires start at $58,176 as a Correctional Officer Trainee and move up to $62,520 as a Correctional Officer after the three-month trainee period. The Corrections Treatment Officer track starts at $65,004 and moves to $71,868 after four months.

How is becoming a correctional officer in Cook County different from IDOC?

The Cook County Sheriff's Office requires applicants to be at least 21, while IDOC accepts applicants at 18. Cook County hires through the Sheriff's Merit Board and trains officers at an ILETSB-certified basic corrections academy rather than at the IDOC academy in Decatur. The work setting is also different: Cook County officers staff the Cook County Jail, which handles pre-trial detainees and shorter sentences, while IDOC officers work at state correctional centers that house people serving longer sentences. Pay scales, union representation, and benefit structures differ between the two employers, so applicants comparing the paths should check current postings from each agency.

Building Your Corrections Career in Illinois

The defining feature of Illinois corrections is that the state hires you first and pays you to train. If the IDOC pay structure and 18-year-old age minimum fit your situation, your next move is the Applicant Data Form. If you are aiming higher than the standard officer role, the Corrections Treatment Officer track and the Federal BOP path both require a bachelor's degree, and the choice usually comes down to whether you want state employment in Joliet or federal employment with broader geographic mobility.

For students working toward the CTOT, federal BOP, or supervisory promotion paths, Dreambound lets you compare criminal justice and corrections-related training programs by length, format, and cost to support the next step.