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Illinois
There are 102 Counties in Illinois
Click the state map for a larger view or select a county from the list below to view a listing of the county officials and other information pertaining to that county.
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| County |
NACo
Member |
2000
Population |
Square
Miles |
County Seat |
Founded |
|
Adams
|
|
68,277
|
857
|
Quincy
|
1825
|
|
Alexander
|
|
9,590
|
236
|
Cairo
|
1819
|
|
Bond
|
|
17,633
|
380
|
Greenville
|
1817
|
|
Boone
|
|
41,786
|
281
|
Belvidere
|
1837
|
|
Brown
|
|
6,950
|
306
|
Mount Sterling
|
1839
|
|
Bureau
|
|
35,503
|
869
|
Princeton
|
1837
|
|
Calhoun
|
|
5,084
|
254
|
Hardin
|
1825
|
|
Carroll
|
|
16,674
|
444
|
Mount Carroll
|
1839
|
|
Cass
|
|
13,695
|
376
|
Virginia
|
1837
|
|
Champaign
|
|
179,669
|
997
|
Urbana
|
1833
|
|
Christian
|
|
35,372
|
709
|
Taylorville
|
1839
|
|
Clark
|
|
17,008
|
502
|
Marshall
|
1819
|
|
Clay
|
|
14,560
|
469
|
Louisville
|
1824
|
|
Clinton
|
|
35,535
|
474
|
Carlyle
|
1824
|
|
Coles
|
|
53,196
|
508
|
Charleston
|
1830
|
|
Cook
|
|
5,376,741
|
946
|
Chicago
|
1831
|
|
Crawford
|
|
20,452
|
444
|
Robinson
|
1816
|
|
Cumberland
|
|
11,253
|
346
|
Toledo
|
1843
|
|
De Kalb
|
|
88,969
|
634
|
Sycamore
|
1837
|
|
De Witt
|
|
16,798
|
398
|
Clinton
|
1839
|
|
Douglas
|
|
19,922
|
417
|
Tuscola
|
1859
|
|
Du Page
|
|
904,161
|
334
|
Wheaton
|
1939
|
|
Edgar
|
|
19,704
|
624
|
Paris
|
1823
|
|
Edwards
|
|
6,971
|
222
|
Albion
|
1814
|
|
Effingham
|
|
34,264
|
479
|
Effingham
|
1831
|
|
Fayette
|
|
21,802
|
716
|
Vandalia
|
1821
|
|
Ford
|
|
14,241
|
486
|
Paxton
|
1859
|
|
Franklin
|
|
39,018
|
412
|
Benton
|
1818
|
|
Fulton
|
|
38,250
|
866
|
Lewistown
|
1823
|
|
Gallatin
|
|
6,445
|
324
|
Shawneetown
|
1812
|
|
Greene
|
|
14,761
|
543
|
Carrollton
|
1821
|
|
Grundy
|
|
37,535
|
420
|
Morris
|
1841
|
|
Hamilton
|
|
8,621
|
435
|
McLeansboro
|
1821
|
|
Hancock
|
|
20,121
|
795
|
Carthage
|
1825
|
|
Hardin
|
|
4,800
|
178
|
Elizabethtown
|
1839
|
|
Henderson
|
|
8,213
|
379
|
Oquawka
|
1841
|
|
Henry
|
|
51,020
|
823
|
Cambridge
|
1825
|
|
Iroquois
|
|
31,334
|
1,116
|
Watseka
|
1833
|
|
Jackson
|
|
59,612
|
588
|
Murphysboro
|
1816
|
|
Jasper
|
|
10,117
|
494
|
Newton
|
1831
|
|
Jefferson
|
|
40,045
|
571
|
Mount Vernon
|
1819
|
|
Jersey
|
|
21,668
|
369
|
Jerseyville
|
1839
|
|
Jo Daviess
|
|
22,289
|
601
|
Galena
|
1827
|
|
Johnson
|
|
12,878
|
346
|
Vienna
|
1812
|
|
Kane
|
|
404,119
|
521
|
Geneva
|
1836
|
|
Kankakee
|
|
103,833
|
678
|
Kankakee
|
1853
|
|
Kendall
|
|
54,544
|
321
|
Yorkville
|
1841
|
|
Knox
|
|
55,836
|
716
|
Galesburg
|
1825
|
|
La Salle
|
|
111,509
|
1,135
|
Ottawa
|
1831
|
|
Lake
|
|
644,356
|
448
|
Waukegan
|
1839
|
|
Lawrence
|
|
15,452
|
372
|
Lawrenceville
|
1821
|
|
Lee
|
|
36,062
|
725
|
Dixon
|
1839
|
|
Livingston
|
|
39,678
|
1,044
|
Pontiac
|
1837
|
|
Logan
|
|
31,183
|
618
|
Lincoln
|
1839
|
|
Macon
|
|
114,706
|
581
|
Decatur
|
1829
|
|
Macoupin
|
|
49,019
|
864
|
Carlinville
|
1829
|
|
Madison
|
|
258,941
|
725
|
Edwardsville
|
1812
|
|
Marion
|
|
41,691
|
572
|
Salem
|
1823
|
|
Marshall
|
|
13,180
|
386
|
Lacon
|
1839
|
|
Mason
|
|
16,038
|
539
|
Havana
|
1841
|
|
Massac
|
|
15,161
|
239
|
Metropolis
|
1843
|
|
McDonough
|
|
32,913
|
589
|
Macomb
|
1826
|
|
McHenry
|
|
260,077
|
604
|
Woodstock
|
1836
|
|
McLean
|
|
150,433
|
1,184
|
Bloomington
|
1830
|
|
Menard
|
|
12,486
|
314
|
Petersburg
|
1839
|
|
Mercer
|
|
16,957
|
561
|
Aledo
|
1825
|
|
Monroe
|
|
27,619
|
388
|
Waterloo
|
1816
|
|
Montgomery
|
|
30,652
|
704
|
Hillsboro
|
1821
|
|
Morgan
|
|
36,616
|
569
|
Jacksonville
|
1823
|
|
Moultrie
|
|
14,287
|
336
|
Sullivan
|
1843
|
|
Ogle
|
|
51,032
|
759
|
Oregon
|
1836
|
|
Peoria
|
|
183,433
|
620
|
Peoria
|
1825
|
|
Perry
|
|
23,094
|
441
|
Pinckneyville
|
1827
|
|
Piatt
|
|
16,365
|
440
|
Monticello
|
1841
|
|
Pike
|
|
17,384
|
830
|
Pittsfield
|
1821
|
|
Pope
|
|
4,413
|
371
|
Golconda
|
1816
|
|
Pulaski
|
|
7,348
|
201
|
Mound City
|
1843
|
|
Putnam
|
|
6,086
|
160
|
Hennepin
|
1825
|
|
Randolph
|
|
33,893
|
578
|
Chester
|
1795
|
|
Richland
|
|
16,149
|
360
|
Olney
|
1841
|
|
Rock Island
|
|
149,374
|
427
|
Rock Island
|
1831
|
|
Saline
|
|
26,733
|
383
|
Harrisburg
|
1847
|
|
Sangamon
|
|
188,951
|
868
|
Springfield
|
1821
|
|
Schuyler
|
|
7,189
|
437
|
Rushville
|
1825
|
|
Scott
|
|
5,537
|
251
|
Winchester
|
1839
|
|
Shelby
|
|
22,893
|
759
|
Shelbyville
|
1827
|
|
St. Clair
|
|
256,082
|
664
|
Belleville
|
1790
|
|
Stark
|
|
6,332
|
288
|
Toulon
|
1839
|
|
Stephenson
|
|
48,979
|
564
|
Freeport
|
1837
|
|
Tazewell
|
|
128,485
|
649
|
Pekin
|
1827
|
|
Union
|
|
18,293
|
416
|
Jonesboro
|
1818
|
|
Vermilion
|
|
83,919
|
899
|
Danville
|
1826
|
|
Wabash
|
|
12,937
|
224
|
Mount Carmel
|
1824
|
|
Warren
|
|
18,735
|
543
|
Monmouth
|
1825
|
|
Washington
|
|
15,148
|
563
|
Nashville
|
1818
|
|
Wayne
|
|
17,151
|
714
|
Fairfield
|
1819
|
|
White
|
|
15,371
|
495
|
Carmi
|
1815
|
|
Whiteside
|
|
60,653
|
685
|
Morrison
|
1836
|
|
Will
|
|
502,266
|
837
|
Joliet
|
1836
|
|
Williamson
|
|
61,296
|
424
|
Marion
|
1839
|
|
Winnebago
|
|
278,418
|
514
|
Rockford
|
1836
|
|
Woodford
|
|
35,469
|
528
|
Eureka
|
1841
|
To report any updates, deletions or additions, contact Database Updates
or send a fax to NACo, Attn: Database Updates (202)393-2630.
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