Illinois Counties listed in Alphabetical Order.

Back to State and Local Government Index

In most cases the county government is located in the courthouse.
This is where you will find vital records, such as birth, marriage and death.
Typically this is also the home to the assessor and the clerk, where you will find property records.
Circuit clerks are keepers of court records, criminal and civil.
The courthouse is also where you typically find the county prosecutor and the sheriff, who collects property taxes.
Population statistics are from the 2002 post-census survey.

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Adams (County)
521 Vermont Street
Quincy, IL 62301
Population: 67,816   Map
Alexander (County)
2000 Washington Avenue
Cairo, IL 62914
Population: 10,228   Map
Bond (County)
200 W. College, 203 Co Ofc Bldg.
Greenville, IL 62246
Population: 17,069   Map
Boone (County)
601 North Main Street
Belvidere, IL 61008
Population: 37,389   Map
Near: Rockford, Il
Brown (County)
Courthouse
Mount Sterling, IL 62353
Population: 6,400   Map
Bureau (County)
700 South Main Street
Princeton, IL 61356
Population: 35,739   Map
Calhoun (County)
P. O. Box 187
Hardin, IL 62047
Population: 5,011   Map
Carroll (County)
P O Box 152
Mount Carroll, IL 61053
Population: 16,907   Map
Cass (County)
Courthouse
Virginia, IL 62691
Population: 13,284   Map
Champaign (County)
212 E Main Street
Urbana, IL 61801
Population: 167,392   Map
Near: Champaign-urbana, Il
Christian (County)
P. O. Box 647
Taylorville, IL 62568
Population: 34,730   Map
Clark (County)
Courthouse
Marshall, IL 62441
Population: 17,571   Map
Clay (County)
P. O. Box 160
Louisville, IL 62858
Population: 14,397   Map
Clinton (County)
Courthouse
Carlyle, IL 62231
Population: 35,368   Map
Near: St. Louis, Mo-il
Coles (County)
P. O. Box 227
Charleston, IL 61920
Population: 51,186   Map
Cook (County)
118 N Clark Street
Co Bldg Rm 818
Chicago, IL 60602
Population: 5,096,540   Map
Near: Chicago, Il
Crawford (County)
P. O. Box 602
Robinson, IL 62454
Population: 21,071   Map
Cumberland (County)
P. O. Box 70
Toledo, IL 62468
Population: 11,169   Map
De Kalb (County)
110 E Sycamore Street
Sycamore, IL 60178
Population: 82,703   Map
Near: Chicago, Il
De Witt (County)
P. O. Box 439
Clinton, IL 61727
Population: 16,795   Map
Douglas (County)
P. O. Box 467
Tuscola, IL 61953
Population: 19,799   Map
Du Page (County)
421 County Farm Road North
Wheaton, IL 60187
Population: 859,310   Map
Near: Chicago, Il
Edgar (County)
Courthouse
Paris, IL 61944
Population: 20,106   Map
Edwards (County)
25 N Fifth Street
Albion, IL 62806
Population: 7,129   Map
Effingham (County)
P. O. Box 628
Effingham, IL 62401
Population: 33,337   Map
Fayette (County)
221 South 7th Street
Vandalia, IL 62471
Population: 21,362   Map
Ford (County)
200 West State Street
Paxton, IL 60957
Population: 14,164   Map
Franklin (County)
Franklin County Courthouse
Benton, IL 62812
Population: 40,948   Map
Fulton (County)
100 N. Main
Lewistown, IL 61542
Population: 38,650   Map
Gallatin (County)
Box 310
Shawneetown, IL 62984
Population: 6,753   Map
Greene (County)
519 N. Main Street
Carrollton, IL 62016
Population: 15,733   Map
Grundy (County)
111 East Washington Street
Morris, IL 60450
Population: 35,712   Map
Near: Chicago, Il
Hamilton (County)
Courthouse
Mcleansboro, IL 62859
Population: 8,622   Map
Hancock (County)
P. O. Box 39
Carthage, IL 62321
Population: 21,205   Map
Hardin (County)
P. O. Box 38
Elizabethtown, IL 62931
Population: 5,068   Map
Henderson (County)
P. O. Box 308
Oquawka, IL 61469
Population: 8,526   Map
Henry (County)
100 South Main
Cambridge, IL 61238
Population: 51,807   Map
Near: Davenport-moline-rock I, Ia-il
Iroquois (County)
1001 E. Grant Street
Watseka, IL 60970
Population: 31,625   Map
Jackson (County)
Jackson County Courthouse
Murphysboro, IL 62966
Population: 61,154   Map
Jasper (County)
P O Box 107
Newton, IL 62448
Population: 10,635   Map
Jefferson (County)
Courthouse
Mount Vernon, IL 62864
Population: 39,090   Map
Jersey (County)
201 W Pearl
Jerseyville, IL 62052
Population: 21,308   Map
Near: St. Louis, Mo-il
Jo Daviess (County)
330 North Bench Street
Galena, IL 61036
Population: 21,783   Map
Johnson (County)
P. O. Box 96
Vienna, IL 62995
Population: 12,954   Map
Kane (County)
719 Batavia Avenue
Geneva, IL 60134
Population: 370,361   Map
Near: Chicago, Il
Kankakee (County)
189 E Court Street
Kankakee, IL 60901
Population: 101,949   Map
Near: Kankakee, Il
Kendall (County)
111 West Fox Street
Yorkville, IL 60560
Population: 47,894   Map
Near: Chicago, Il
Knox (County)
Courthouse
Galesburg, IL 61401
Population: 55,936   Map
La Salle (County)
Box 487
Ottawa, IL 61350
Population: 109,462   Map
Lake (County)
18 N County Street Room 901
Waukegan, IL 60085
Population: 582,983   Map
Near: Chicago, Il
Lawrence (County)
Courthouse
Lawrenceville, IL 62439
Population: 15,865   Map
Lee (County)
P. O. Box 328
Dixon, IL 61021
Population: 35,959   Map
Livingston (County)
112 West Madison Street
Pontiac, IL 61764
Population: 40,597   Map
Logan (County)
Courthouse, Room 20
Lincoln, IL 62656
Population: 31,499   Map
Macon (County)
253 East Wood Street
Decatur, IL 62523
Population: 115,416   Map
Near: Decatur, Il
Macoupin (County)
Courthouse
Carlinville, IL 62626
Population: 48,994   Map
Madison (County)
P. O. Box 586
Edwardsville, IL 62025
Population: 256,007   Map
Near: St. Louis, Mo-il
Marion (County)
P. O. Box 907
Salem, IL 62881
Population: 42,295   Map
Marshall (County)
122 N. Prairie
Lacon, IL 61540
Population: 12,789   Map
Mason (County)
Courthouse
Havana, IL 62644
Population: 16,820   Map
Massac (County)
P. O. Box 429
Metropolis, IL 62960
Population: 15,336   Map
Mcdonough (County)
Courthouse
Macomb, IL 61455
Population: 34,152   Map
Mchenry (County)
2200 N Seminary - Courthouse
Woodstock, IL 60098
Population: 230,555   Map
Near: Chicago, Il
Mclean (County)
P. O. Box 2400
Bloomington, IL 61702
Population: 139,133   Map
Near: Bloomington-normal, Il
Menard (County)
P. O. Box 465
Petersburg, IL 62675
Population: 12,359   Map
Near: Springfield, Il
Mercer (County)
P. O. Box 66
Aledo, IL 61231
Population: 17,605   Map
Monroe (County)
100 South Main Street
Waterloo, IL 62298
Population: 25,358   Map
Near: St. Louis, Mo-il
Montgomery (County)
Courthouse
Hillsboro, IL 62049
Population: 31,059   Map
Morgan (County)
300 W State
Jacksonville, IL 62650
Population: 36,252   Map
Moultrie (County)
Courthouse
Sullivan, IL 61951
Population: 14,319   Map
Ogle (County)
P. O. Box 40
Oregon, IL 61061
Population: 50,107   Map
Near: Rockford, Il
Peoria (County)
Courthouse Rm G15
324 Main Street
Peoria, IL 61602
Population: 183,337   Map
Near: Peoria-pekin, Il
Perry (County)
P O Box 158
Pinckneyville, IL 62274
Population: 21,498   Map
Piatt (County)
P. O. Box 558
Monticello, IL 61856
Population: 16,357   Map
Pike (County)
Courthouse
Pittsfield, IL 62363
Population: 17,251   Map
Pope (County)
P. O. Box 216
Golconda, IL 62938
Population: 4,735   Map
Pulaski (County)
P. O. Box 108
Mound City, IL 62963
Population: 7,348   Map
Putnam (County)
Courthouse
Hennepin, IL 61327
Population: 5,715   Map
Randolph (County)
#1 Taylor St
Chester, IL 62233
Population: 34,240   Map
Richland (County)
C/o Richland Co Courthouse
Olney, IL 62450
Population: 16,747   Map
Rock Island (County)
1504 Third Avenue
Rock Island, IL 61201
Population: 148,640   Map
Near: Davenport-moline-rock I, Ia-il
Saline (County)
Courthouse
Harrisburg, IL 62946
Population: 26,476   Map
Sangamon (County)
200 South 9th Street
Springfield, IL 62701
Population: 191,771   Map
Near: Springfield, Il
Schuyler (County)
P. O. Box 200
Rushville, IL 62681
Population: 7,702   Map
Scott (County)
Courthouse
Winchester, IL 62694
Population: 5,615   Map
Shelby (County)
Courthouse
Shelbyville, IL 62565
Population: 22,660   Map
St Clair (County)
10 Public Square
Belleville, IL 62220
Population: 264,419   Map
Near: St. Louis, Mo-il
Stark (County)
130 West Main Street
Toulon, IL 61483
Population: 6,402   Map
Stephenson (County)
15 North Galena Avenue
Freeport, IL 61032
Population: 49,167   Map
Tazewell (County)
4th & Court St Mckenzie Bldg
Pekin, IL 61554
Population: 128,366   Map
Near: Peoria-pekin, Il
Union (County)
P. O. Box H
Jonesboro, IL 62952
Population: 18,079   Map
Vermilion (County)
6 North Vermillion
Danville, IL 61832
Population: 85,260   Map
Wabash (County)
P. O. Box 428
Mount Carmel, IL 62863
Population: 12,681   Map
Warren (County)
100 West Broadway
Monmouth, IL 61462
Population: 18,901   Map
Washington (County)
Courthouse, St. Louis Street
Nashville, IL 62263
Population: 15,204   Map
Wayne (County)
P. O. Box 187
Fairfield, IL 62837
Population: 17,049   Map
White (County)
P. O. Box 369
Carmi, IL 62821
Population: 15,840   Map
Whiteside (County)
200 East Knox Street
Morrison, IL 61270
Population: 60,225   Map
Will (County)
302 N Chicago St
Joliet, IL 60432
Population: 427,818   Map
Near: Chicago, Il
Williamson (County)
200 W. Jefferson
Marion, IL 62959
Population: 60,764   Map
Winnebago (County)
400 West State Street
Rockford, IL 61101
Population: 264,873   Map
Near: Rockford, Il
Woodford (County)
115 North Main, Ste. 202
Eureka, IL 61530
Population: 34,798   Map
Near: Peoria-pekin, Il

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