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 |