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Illinois

State in USA

Contents: Subdivision

The population development in Illinois as well as related information and services (Wikipedia, Google, images).

The Details icon links to further information about a selected division including its population structure (gender, age groups, age distribution, urbanization, »race«, ethnicity).

NameStatusPopulation
Census
1990-04-01		Population
Census
2000-04-01		Population
Census
2010-04-01		Population
Census
2020-04-01		Population
Estimate
2025-07-01
IllinoisState11,430,60212,419,29312,830,63212,821,74112,719,141
AdamsCounty66,09068,27767,10365,74564,267
AlexanderCounty10,6269,5908,2385,2394,570
BondCounty14,99117,63317,76816,89916,959
BooneCounty30,80641,78654,16553,44653,568
BrownCounty5,8366,9506,9376,2456,401
BureauCounty35,68835,50334,97833,26932,510
CalhounCounty5,3225,0845,0894,4304,300
CarrollCounty16,80516,67415,38715,72015,419
CassCounty13,43713,69513,64213,03712,463
ChampaignCounty173,025179,669201,081206,445209,972
ChristianCounty34,41835,37234,80034,04133,443
ClarkCounty15,92117,00816,33515,48715,114
ClayCounty14,46014,56013,81513,28912,793
ClintonCounty33,94435,53537,76236,90437,128
ColesCounty51,64453,19653,87347,18746,607
CookCounty5,105,0675,376,7415,194,6755,279,0105,194,625
CrawfordCounty19,46420,45219,81718,65518,648
CumberlandCounty10,67011,25311,04810,45010,208
DeKalbCounty77,93288,969105,160100,522101,835
De Witt (DeWitt)County16,51616,79816,56115,50715,118
DouglasCounty19,46419,92219,98019,74619,880
DuPageCounty781,666904,161916,924933,029934,298
EdgarCounty19,59519,70418,57616,87416,323
EdwardsCounty7,4406,9716,7216,2435,898
EffinghamCounty31,70434,26434,24234,66534,519
FayetteCounty20,89321,80222,14021,48920,790
FordCounty14,27514,24114,08113,53213,216
FranklinCounty40,31939,01839,56137,80136,916
FultonCounty38,08038,25037,06933,68132,901
GallatinCounty6,9096,4455,5894,9424,616
GreeneCounty15,31714,76113,88611,97511,313
GrundyCounty32,33737,53550,06352,55954,052
HamiltonCounty8,4998,6218,4577,9927,859
HancockCounty21,37320,12119,10417,64116,803
HardinCounty5,1894,8004,3203,6593,588
HendersonCounty8,0968,2137,3316,3925,984
HenryCounty51,15951,02050,48649,28448,095
IroquoisCounty30,78731,33429,71827,06626,150
JacksonCounty61,06759,61260,21853,34752,501
JasperCounty10,60910,1179,6989,2999,032
JeffersonCounty37,02040,04538,82737,11536,147
JerseyCounty20,53921,66822,98521,51621,160
Jo DaviessCounty21,82122,28922,67822,07521,594
JohnsonCounty11,34712,87812,58213,30413,363
KaneCounty317,471404,119515,269516,709525,757
KankakeeCounty96,255103,833113,449107,648105,525
KendallCounty39,41354,544114,736131,876145,470
KnoxCounty56,39355,83652,91949,97647,767
LakeCounty516,418644,356703,462714,394719,339
La SalleCounty106,913111,509113,924109,645107,773
LawrenceCounty15,97215,45216,83315,30113,790
LeeCounty34,39236,06236,03134,15232,914
LivingstonCounty39,30139,67838,95035,84035,057
LoganCounty30,79831,18330,30527,98827,182
MaconCounty117,206114,706110,768103,99599,300
MacoupinCounty47,67949,01947,76545,04443,748
MadisonCounty249,238258,941269,282265,983263,110
MarionCounty41,56141,69139,43737,74036,382
MarshallCounty12,84613,18012,64011,75011,473
MasonCounty16,26916,03814,66613,08212,411
MassacCounty14,75215,16115,42914,17613,502
McDonoughCounty35,24432,91332,61227,25425,916
McHenryCounty183,241260,077308,760310,305317,751
McLeanCounty129,180150,433169,572171,226171,419
MenardCounty11,16412,48612,70512,29711,863
MercerCounty17,29016,95716,43415,70115,229
MonroeCounty22,42227,61932,95734,95634,840
MontgomeryCounty30,72830,65230,10428,32728,076
MorganCounty36,39736,61635,54733,56732,515
MoultrieCounty13,93014,28714,84614,53014,371
OgleCounty45,95751,03253,49751,85051,399
PeoriaCounty182,827183,433186,494182,008178,553
PerryCounty21,41223,09422,35020,93820,160
PiattCounty15,54816,36516,72916,68416,791
PikeCounty17,57717,38416,43014,72814,231
PopeCounty4,3734,4134,4703,7663,672
PulaskiCounty7,5237,3486,1615,2064,820
PutnamCounty5,7306,0866,0065,6315,619
RandolphCounty34,58333,89333,47630,16529,921
RichlandCounty16,54516,14916,23315,82715,219
Rock IslandCounty148,723149,374147,546144,669141,869
SalineCounty26,55126,73324,91323,82122,772
SangamonCounty178,386188,951197,465196,405194,170
SchuylerCounty7,4987,1897,5446,8966,657
ScottCounty5,6445,5375,3555,0764,866
ShelbyCounty22,26122,89322,36320,99120,576
StarkCounty6,5346,3325,9945,3955,319
St. ClairCounty262,852256,082270,056257,617250,708
StephensonCounty48,05248,97947,71144,69643,220
TazewellCounty123,692128,485135,394131,556130,049
UnionCounty17,61918,29317,80817,35016,656
VermilionCounty88,25783,91981,62574,20171,259
WabashCounty13,11112,93711,94711,36110,907
WarrenCounty19,18118,73517,70716,84416,222
WashingtonCounty14,96515,14814,71613,76513,564
WayneCounty17,24117,15116,76016,18915,882
WhiteCounty16,52215,37114,66513,87213,250
WhitesideCounty60,18660,65358,49855,68854,121
WillCounty357,313502,266677,560697,361712,253
WilliamsonCounty57,73361,29666,35767,16367,225
WinnebagoCounty252,913278,418295,266285,351283,674
WoodfordCounty32,65335,46938,66438,45638,111
USA [United States of America]Federal Republic248,709,873281,421,906308,745,538331,516,113341,784,857

Source: U.S. Census Bureau.

Explanation: Latest available rebased total population figures are tabulated.

Further information about the population structure:

Gender (E 2024)
Males6,282,332
Females6,427,826
Age Groups (E 2024)
0-17 years2,697,461
18-64 years7,741,399
65+ years2,271,298
Age Distribution (E 2024)
80+ years520,679
70-79 years1,020,427
60-69 years1,528,396
50-59 years1,548,343
40-49 years1,626,392
30-39 years1,745,082
20-29 years1,695,145
10-19 years1,615,488
0-9 years1,410,206
Urbanization (C 2020)
Rural1,674,918
Urban11,137,590
»Race« (C 2020)
White7,868,227
Black/African American1,808,271
Indigenous96,498
Asian754,878
Pacific Islander4,501
Some other1,135,149
2 or more1,144,984
Ethnicity (C 2020)
Hispanic or Latino2,337,410
Other10,475,098

See also: