Illinois County Map

List of Counties in Illinois

CountyFIPS CodeCounty SeatEstablished inPopulationArea (sq mi)Area (km2)
Adams County1Quincy182565,6918552,214
Alexander County3Cairo18196,060235609
Bond County5Greenville181716,630380984
Boone County7Belvidere183753,577280725
Brown County9Mount Sterling18396,556305790
Bureau County11Princeton183732,9938692,251
Calhoun County13Hardin18254,802253655
Carroll County15Mount Carroll183914,3124451,153
Cass County17Virginia183712,260375971
Champaign County19Urbana1833209,9839962,580
Christian County21Taylorville183932,6617091,836
Clark County23Marshall181915,5965011,298
Clay County25Louisville182413,2534681,212
Clinton County27Carlyle182437,6394741,228
Coles County29Charleston183050,8855081,316
Cook County31Chicago18315,180,4939442,445
Crawford County33Robinson181618,8074431,147
Cumberland County35Toledo184310,808345894
DeKalb County37Sycamore1837104,1436311,634
DeWitt County39Clinton183915,7693971,028
Douglas County41Tuscola185919,4794161,077
DuPage County43Wheaton1839928,589327847
Edgar County45Paris182317,3606231,614
Edwards County47Albion18146,392222575
Effingham County49Effingham183134,2084781,238
Fayette County51Vandalia182121,4167161,854
Ford County53Paxton185913,2644851,256
Franklin County55Benton181838,7014081,057
Fulton County57Lewistown182334,8448652,240
Gallatin County59Shawneetown18125,058322834
Greene County61Carrollton182113,0445431,406
Grundy County63Morris184150,9724181,083
Hamilton County65McLeansboro18218,1634341,124
Hancock County67Carthage182517,8447932,054
Hardin County69Elizabethtown18393,910177458
Henderson County71Oquawka18416,709378979
Henry County73Cambridge182549,0908222,129
Iroquois County75Watseka183327,6041,1172,893
Jackson County77Murphysboro181657,4195841,513
Jasper County79Newton18319,6114941,279
Jefferson County81Mount Vernon181937,8205711,479
Jersey County83Jerseyville183921,847369956
Jo Daviess County85Galena182721,3666001,554
Johnson County87Vienna181212,456343888
Kane County89Geneva1836534,2165191,344
Kankakee County91Kankakee1853110,0246761,751
Kendall County93Yorkville1841127,915320829
Knox County95Galesburg182550,1127161,854
Lake County97Waukegan1839700,8324431,147
LaSalle County99Ottawa1831109,4301,1352,940
Lawrence County101Lawrenceville182115,765372963
Lee County103Dixon183934,2237241,875
Livingston County105Pontiac183735,7611,0432,701
Logan County107Lincoln183928,9256181,601
Macon County115Decatur1829104,7125801,502
Macoupin County117Carlinville182945,3138622,233
Madison County119Edwardsville1812264,4617161,854
Marion County121Salem182337,6205721,481
Marshall County123Lacon183911,5343861,000
Mason County125Havana184113,5655391,396
Massac County127Metropolis184314,080237614
McDonough County109Macomb182629,9555891,526
McHenry County111Woodstock1836308,5706031,562
McLean County113Bloomington1830172,8281,1833,064
Menard County129Petersburg183912,288314813
Mercer County131Aledo182515,6015611,453
Monroe County133Waterloo181634,335385997
Montgomery County135Hillsboro182128,6017031,821
Morgan County137Jacksonville182333,9765681,471
Moultrie County139Sullivan184314,717335868
Ogle County141Oregon183650,9237581,963
Peoria County143Peoria1825180,6216181,601
Perry County145Pinckneyville182721,1744411,142
Piatt County147Monticello184116,3964391,137
Pike County149Pittsfield182115,6118312,152
Pope County151Golconda18164,212368953
Pulaski County153Mound City18435,463199515
Putnam County155Hennepin18255,740160414
Randolph County157Chester179532,1065751,489
Richland County159Olney184115,763360932
Rock Island County161Rock Island1831143,4774271,106
Saline County165Harrisburg184723,906379982
Sangamon County167Springfield1821195,3488682,248
Schuyler County169Rushville18256,9074371,132
Scott County171Winchester18394,926250647
Shelby County173Shelbyville182721,7417581,963
St. Clair County163Belleville1790261,0596571,702
Stark County175Toulon18395,427288746
Stephenson County177Freeport183744,7535641,461
Tazewell County179Pekin1827132,3286461,673
Union County181Jonesboro181816,8414131,070
Vermilion County183Danville182676,8068982,326
Wabash County185Mount Carmel182411,549223578
Warren County187Monmouth182517,0325421,404
Washington County189Nashville181813,9955621,456
Wayne County191Fairfield181916,3327131,847
White County193Carmi181513,6654941,279
Whiteside County195Morrison183655,6266841,772
Will County197Joliet1836692,3108352,163
Williamson County199Marion183967,0564201,088
Winnebago County201Rockford1836284,0815131,329
Woodford County203Eureka184138,4635271,365