Illinois
United States
Updated - November 29, 2025
Picture By: Illinois State Police
The primary state law enforcement agency is the Illinois State Police (ISP). The ISP is responsible for enforcing state laws, patrolling highways, and providing support to local law enforcement agencies. They also handle specialized tasks such as forensic investigations, emergency response, and criminal investigations.
*Only agencies with police powers are listed.
-Clicking the agency's name takes you to their homepage-
State Agencies
| Agency (Click Me) |
Governing Body | Primary Responsibilities | Authority to write traffic tickets? |
|---|---|---|---|
| Illinois State Police | Illinois | Statewide patrol, traffic enforcement, and criminal investigations | Yes |
| Illinois Conservation Police | Illinois Department of Natural Resources | Natural resource protection, state park law enforcement, and waterway law enforcement | Yes |
| Illinois Secretary of State Police | Illinois Secretary of State | State capitol security, DMV security, auto theft investigations, and traffic enforcement | Yes |
| ICC Police | Illinois Commerce Commission | Enforcement of ICC regulations, motor carriers, and investigations related to transportation | Yes |
| Arson Investigators | Illinois State Fire Marshal | Fire and arson investigations | No |
| Special Investigators | Illinois Attorney General | Investigations related to consumer fraud, public corruption, and other state laws | No |
Agency Vehicles
Illinois State Police vehicle (Photo by Illinois State Police)
Illinois Conservation Police vehicle (Photo by Illinois Conservation Police)
Illinois Secretary of State Police vehicle (Photo by Inventorchris)
ICC Police vehicle (Photo by Christopher Holmes)
Illinois State Fire Marshal - Arson Investigator vehicle (Photo by Illinois State Fire Marshal)