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State Trooper / Highway Patrol Officer · Illinois

State trooper salary in Illinois

State troopers in Illinois earn a median $100,520 a year across all employers.

$100,520
median pay in IL, all employers
29,180
workers in IL (SOC 33-3051)

Source: U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS), May 2025 — state estimates. Data captured September 30, 2026.

Pay in Illinois, all employers Sourced

Police and Sheriff's Patrol Officers (SOC 33-3051) in Illinois, all employers combined: BLS state estimates do not separate government from private.

MeasureIL
Workers29,180
10th percentile$58,420
Median$100,520
90th percentile$119,560
National median, government employers$76,300

Sources: U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS), May 2025 — state estimates; U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS), May 2025 — national estimates by ownership. Data captured September 30, 2026.

Pension in Illinois

State employees: State public safety

PlanAccrualNormal retirementEmployee paysSocial Security
SERS Tier 2 alternative formula - State Police and other police-power positions (non-coordinated)
Tier 2 alternative formula (not covered by Social Security)
3%age 55 with 20 years of alternative service in a listed police-power position12.5%Not stated

The statewide plan a new hire usually joins. Some cities and counties run their own plans; check with the employer. Each plan's formula, vesting, cost-of-living adjustment and retiree health are on the Illinois pension plans list.

Source: State retirement systems, Official state retirement system pages, member handbooks and statutes. Data captured October 2, 2026.

Free practice tests for Illinois

Source: Open Exam Prep, Open Exam Prep free practice tests. Data captured October 1, 2026. Each link was opened and its exam title checked on the date shown.

More about this job

Requirements, hiring process, training, schedule and day-to-day work are on the national State Trooper / Highway Patrol Officer page.

State Trooper / Highway Patrol Officer in other states

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Illinois government jobs · Illinois public pension plans · police officer standards in Illinois · exam practice in Illinois