Illinois library
Illinois Counties
102 counties, each with its judicial district and prosecuting office.
- Cook County, Illinoispop. 5,275,541
- DuPage County, Illinoispop. 932,877
- Lake County, Illinoispop. 714,342
- Will County, Illinoispop. 696,355
- Kane County, Illinoispop. 516,522
- McHenry County, Illinoispop. 310,229
- Winnebago County, Illinoispop. 285,350
- Madison County, Illinoispop. 265,859
- St. Clair County, Illinoispop. 257,400
- Champaign County, Illinoispop. 205,865
- Sangamon County, Illinoispop. 196,343
- Peoria County, Illinoispop. 181,830
- McLean County, Illinoispop. 170,954
- Rock Island County, Illinoispop. 144,672
- Kendall County, Illinoispop. 131,869
- Tazewell County, Illinoispop. 131,343
- LaSalle County, Illinoispop. 109,658
- Kankakee County, Illinoispop. 107,502
- Macon County, Illinoispop. 103,998
- DeKalb County, Illinoispop. 100,420
- Vermilion County, Illinoispop. 74,188
- Williamson County, Illinoispop. 67,153
- Adams County, Illinoispop. 65,737
- Whiteside County, Illinoispop. 55,691
- Boone County, Illinoispop. 53,448
- Jackson County, Illinoispop. 52,974
- Grundy County, Illinoispop. 52,533
- Ogle County, Illinoispop. 51,788
- Knox County, Illinoispop. 49,967
- Henry County, Illinoispop. 49,284
- Coles County, Illinoispop. 46,863
- Macoupin County, Illinoispop. 44,967
- Stephenson County, Illinoispop. 44,630
- Woodford County, Illinoispop. 38,467
- Franklin County, Illinoispop. 37,804
- Marion County, Illinoispop. 37,729
- Jefferson County, Illinoispop. 37,113
- Clinton County, Illinoispop. 36,899
- Livingston County, Illinoispop. 35,815
- Monroe County, Illinoispop. 34,962
- Effingham County, Illinoispop. 34,668
- Lee County, Illinoispop. 34,145
- Christian County, Illinoispop. 34,032
- Fulton County, Illinoispop. 33,609
- Bureau County, Illinoispop. 33,244
- Morgan County, Illinoispop. 32,915
- Randolph County, Illinoispop. 30,163
- Montgomery County, Illinoispop. 28,288
- Logan County, Illinoispop. 27,987
- McDonough County, Illinoispop. 27,238
- Iroquois County, Illinoispop. 27,077
- Saline County, Illinoispop. 23,768
- Jo Daviess County, Illinoispop. 22,035
- Jersey County, Illinoispop. 21,512
- Fayette County, Illinoispop. 21,488
- Shelby County, Illinoispop. 20,990
- Perry County, Illinoispop. 20,945
- Douglas County, Illinoispop. 19,740
- Crawford County, Illinoispop. 18,679
- Hancock County, Illinoispop. 17,620
- Union County, Illinoispop. 17,244
- Edgar County, Illinoispop. 16,866
- Warren County, Illinoispop. 16,835
- Bond County, Illinoispop. 16,725
- Piatt County, Illinoispop. 16,673
- Wayne County, Illinoispop. 16,179
- Richland County, Illinoispop. 15,813
- Carroll County, Illinoispop. 15,702
- Mercer County, Illinoispop. 15,699
- De Witt County, Illinoispop. 15,516
- Clark County, Illinoispop. 15,455
- Lawrence County, Illinoispop. 15,280
- Pike County, Illinoispop. 14,739
- Moultrie County, Illinoispop. 14,526
- Massac County, Illinoispop. 14,169
- White County, Illinoispop. 13,877
- Washington County, Illinoispop. 13,761
- Ford County, Illinoispop. 13,534
- Johnson County, Illinoispop. 13,308
- Clay County, Illinoispop. 13,288
- Mason County, Illinoispop. 13,086
- Cass County, Illinoispop. 13,042
- Menard County, Illinoispop. 12,297
- Greene County, Illinoispop. 11,985
- Marshall County, Illinoispop. 11,742
- Wabash County, Illinoispop. 11,361
- Cumberland County, Illinoispop. 10,450
- Jasper County, Illinoispop. 9,287
- Hamilton County, Illinoispop. 7,993
- Schuyler County, Illinoispop. 6,902
- Henderson County, Illinoispop. 6,387
- Edwards County, Illinoispop. 6,245
- Brown County, Illinoispop. 6,244
- Putnam County, Illinoispop. 5,637
- Stark County, Illinoispop. 5,400
- Alexander County, Illinoispop. 5,240
- Pulaski County, Illinoispop. 5,193
- Scott County, Illinoispop. 4,949
- Gallatin County, Illinoispop. 4,946
- Calhoun County, Illinoispop. 4,437
- Pope County, Illinoispop. 3,763
- Hardin County, Illinoispop. 3,649