Cook
IL flag

Cook

County

Details

GEOID
17031
State
IL
Population
5,194,625 (2025 est.)
Data Source
Census tiger
Center Coordinates
41.8954, -87.6461

Geographic Boundary

Data Completeness

50% (5/10)
Geographic boundary
Center coordinates
Wikipedia link
Budget link
Agencies (22)
Services
Legislative bodies
Elected officials
State abbreviation
Parent jurisdiction

Agencies (22)

Assessor's Office

Executive Cook

Assesses the value of all residential and commercial property in Cook County for taxation purposes

Treasurer's Office

Executive Cook

Cook County Treasurer responsible for collecting and safeguarding property tax revenue

Bureau of Technology

Executive Cook

Provides information technology services and digital infrastructure for Cook County government

Medical Examiner's Office

Executive Cook

Investigates deaths within Cook County to determine cause and manner of death

Office of the President

Executive Cook

Chief Executive Officer of Cook County

State's Attorney's Office

Executive Cook

Cook County State's Attorney responsible for prosecuting criminal cases and representing the county in civil matters

Cook County Health and Hospital System

Executive Cook

Operates Stroger Hospital, Provident Hospital, and community health centers serving Cook County residents

Clerk of the Circuit Court

Executive Cook

Maintains records for the Circuit Court of Cook County, the largest unified court system in the country

Forest Preserve District of Cook County

Executive Cook

Manages over 70,000 acres of forest preserves, trails, and nature centers across Cook County

Clerk's Office

Executive Cook

Cook County Clerk responsible for vital records, elections, and property tax administration

Facilities Management

Executive Cook

Manages and maintains Cook County government buildings and facilities

Recorder of Deeds

Executive Cook

Records and maintains documents related to real estate transactions in Cook County

Department of Homeland Security and Emergency Management

Public_safety Cook

Coordinates homeland security initiatives and emergency preparedness for Cook County

Budget and Management Services

Executive Cook

Manages the Cook County budget process and provides management analysis services

Sheriff's Office

Public_safety Cook

Cook County Sheriff responsible for law enforcement, court services, and correctional facilities

Bureau of Economic Development

Executive Cook

Promotes economic growth and development throughout Cook County

Department of Transportation and Highways

Executive Cook

Plans, designs, constructs, and maintains Cook County highways and transportation infrastructure

Board of Commissioners

Legislative Cook

Legislative body of Cook County government

Department of Finance

Executive Cook

Manages Cook County financial operations, accounting, and revenue collection

Emergency Management

Public_safety Cook

Coordinates emergency preparedness, response, and recovery for Cook County

Department of Human Resources

Executive Cook

Manages recruitment, employee relations, and workforce development for Cook County

Public Defender's Office

Judicial Cook

Provides legal representation to indigent defendants in Cook County criminal and juvenile courts