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County profile

Seat
Chicago
Population
5,109,292
Land area
945.0 sq mi
Founded
1831
Circuit
Circuit Court of Cook County (1st Judicial Circuit of Illinois)

Sheriff office

Sheriff
Sheriff Tom Dart
Address
50 W Washington St, Chicago, IL 60602
Phone
(312) 603-6444
Website
https://www.cookcountysheriff.org/
Primary booking
Cook County Department of Corrections

Detention facilities

Looking for the closest facility? Try the facility finder.

Leadership

Sheriff
Sheriff Tom Dart
Phone
(312) 603-6444

Key contacts

  • Sheriff Eleanor Mbeki
    Sheriff staff β€” Cook County Sheriff's Office
  • Officer Anthony Walsh
    Jail employee β€” Cook County Jail
  • Sgt. Linda Chen
    Jail employee β€” Cook County Jail

Staff directory entries. Email addresses are hidden on public pages.

About

Cook County is one of Illinois's 102 counties, with its county seat at Chicago. Falls under the Circuit Court of Cook County (1st Judicial Circuit of Illinois). All values shown are demo placeholders pending pilot confirmation.