705 ILCS 35/1
The county of Cook shall be one judicial circuit and the State of Illinois, exclusive of the county of Cook, shall be and is divided into judicial circuits as follows:
First Circuit--The counties of Alexander, Pulaski, Massac, Pope, Johnson, Union, Jackson, Williamson and Saline.
Second Circuit--The counties of Hardin, Gallatin, White, Hamilton, Franklin, Wabash, Edwards, Wayne, Jefferson, Richland, Lawrence and Crawford.
Third Circuit--The counties of Madison and Bond.
Fourth Circuit--The counties of Clinton, Marion, Clay, Fayette, Effingham, Jasper, Montgomery, Shelby, and Christian.
Fifth Circuit--The counties of Vermilion, Edgar, Clark, Cumberland and Coles.
Sixth Circuit--The counties of Champaign, Douglas, Moultrie, Macon, DeWitt, and Piatt.
Seventh Circuit--The counties of Sangamon, Macoupin, Morgan, Scott, Greene, and Jersey.
Eighth Circuit--The counties of Adams, Schuyler, Mason, Cass, Brown, Pike, Calhoun, and Menard.
Ninth Circuit--The counties of Knox, Warren, Henderson, Hancock, McDonough, and Fulton.
Tenth Circuit--The counties of Peoria, Marshall, Putnam, Stark, and Tazewell.
Eleventh Circuit--The counties of McLean, Livingston, Logan, Ford, and Woodford.
Twelfth Circuit--The county of Will.
Thirteenth Circuit--The counties of Bureau, LaSalle, and Grundy.
Fourteenth Circuit--The counties of Rock Island, Mercer, Whiteside, and Henry.
Fifteenth Circuit--The counties of Jo Daviess, Stephenson, Carroll, Ogle, and Lee.
Sixteenth Circuit--The county of Kane.
Seventeenth Circuit--The counties of Winnebago and Boone.
Eighteenth Circuit--The county of DuPage.
Nineteenth Circuit--The county of Lake.
Twentieth Circuit--Before December 5, 2022, the counties of Randolph, Monroe, St. Clair, Washington, and Perry. On and after December 5, 2022, the county of St. Clair.
Twenty-first Circuit--The counties of Iroquois and Kankakee.
Twenty-second Circuit--The county of McHenry.
Twenty-third Circuit--The counties of DeKalb and Kendall.
Twenty-fourth Circuit--On and after December 5, 2022, the counties of Randolph, Monroe, Washington, and Perry.
705 ILCS 35/1