Sheriff's Deputies provide the other services of the sheriff, such as service of process, enforcing evictions and levies, securing courthouses, securing and operating the 9,000-plus detainee population of the Cook County Jail, transporting prisoners and overseeing offender rehabilitation programs.

[3] The Cook County Sheriff's Police Department has over 500 state certified law enforcement officers charged with patrolling unincorporated areas of Cook County as well as assisting suburban police departments with police operations including, but not limited to, detective and crime scene investigator (CSI) services, narcotics interdiction, bomb detection and disposal, vice operations, street crimes suppression and hostage/barricade/terrorist incidents.

Cook County Sheriff's Department of Corrections is one of the largest single-site pre-trial holding facilities in the world.

Deputy Sheriff's assigned to Department of Corrections are responsible for the security of more than 9,000 detainees, many of whom are violent offenders awaiting trial in the criminal court system.

The Court Services Department provides security for all courtrooms, judges and other government officials as well as prisoners being tried.