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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, »race«, ethnicity).

NameStatusPopulation
Census
1990-04-01		Population
Census
2000-04-01		Population
Census
2010-04-01		Population
Census
2020-04-01		Population
Estimate
2021-07-01
IllinoisState11,430,60212,419,29312,830,63212,812,50812,671,469
AdamsCounty66,09068,27767,10365,73764,954
AlexanderCounty10,6269,5908,2385,2405,030
BondCounty14,99117,63317,76816,72516,596
BooneCounty30,80641,78654,16553,44853,159
BrownCounty5,8366,9506,9376,2446,421
BureauCounty35,68835,50334,97833,24432,883
CalhounCounty5,3225,0845,0894,4374,369
CarrollCounty16,80516,67415,38715,70215,698
CassCounty13,43713,69513,64213,04212,773
ChampaignCounty173,025179,669201,081205,865205,943
ChristianCounty34,41835,37234,80034,03233,662
ClarkCounty15,92117,00816,33515,45515,300
ClayCounty14,46014,56013,81513,28813,143
ClintonCounty33,94435,53537,76236,89936,793
ColesCounty51,64453,19653,87346,86346,765
CookCounty5,105,0675,376,7415,194,6755,275,5415,173,146
CrawfordCounty19,46420,45219,81718,67918,659
CumberlandCounty10,67011,25311,04810,45010,345
DeKalbCounty77,93288,969105,160100,420100,414
De Witt (DeWitt)County16,51616,79816,56115,51615,341
DouglasCounty19,46419,92219,98019,74019,722
DuPageCounty781,666904,161916,924932,877924,885
EdgarCounty19,59519,70418,57616,86616,520
EdwardsCounty7,4406,9716,7216,2456,075
EffinghamCounty31,70434,26434,24234,66834,430
FayetteCounty20,89321,80222,14021,48821,384
FordCounty14,27514,24114,08113,53413,511
FranklinCounty40,31939,01839,56137,80437,442
FultonCounty38,08038,25037,06933,60933,197
GallatinCounty6,9096,4455,5894,9464,903
GreeneCounty15,31714,76113,88611,98511,843
GrundyCounty32,33737,53550,06352,53352,989
HamiltonCounty8,4998,6218,4577,9937,911
HancockCounty21,37320,12119,10417,62017,400
HardinCounty5,1894,8004,3203,6493,650
HendersonCounty8,0968,2137,3316,3876,312
HenryCounty51,15951,02050,48649,28448,907
IroquoisCounty30,78731,33429,71827,07726,827
JacksonCounty61,06759,61260,21852,97452,565
JasperCounty10,60910,1179,6989,2879,193
JeffersonCounty37,02040,04538,82737,11336,877
JerseyCounty20,53921,66822,98521,51221,333
Jo DaviessCounty21,82122,28922,67822,03521,939
JohnsonCounty11,34712,87812,58213,30813,463
KaneCounty317,471404,119515,269516,522515,588
KankakeeCounty96,255103,833113,449107,502106,601
KendallCounty39,41354,544114,736131,869134,867
KnoxCounty56,39355,83652,91949,96749,268
LakeCounty516,418644,356703,462714,342711,239
La SalleCounty106,913111,509113,924109,658108,965
LawrenceCounty15,97215,45216,83315,28015,152
LeeCounty34,39236,06236,03134,14534,049
LivingstonCounty39,30139,67838,95035,81535,664
LoganCounty30,79831,18330,30527,98727,992
MaconCounty117,206114,706110,768103,998102,432
MacoupinCounty47,67949,01947,76544,96744,406
MadisonCounty249,238258,941269,282265,859264,490
MarionCounty41,56141,69139,43737,72937,390
MarshallCounty12,84613,18012,64011,74211,663
MasonCounty16,26916,03814,66613,08612,881
MassacCounty14,75215,16115,42914,16913,960
McDonoughCounty35,24432,91332,61227,23826,828
McHenryCounty183,241260,077308,760310,229311,122
McLeanCounty129,180150,433169,572170,954170,889
MenardCounty11,16412,48612,70512,29712,164
MercerCounty17,29016,95716,43415,69915,582
MonroeCounty22,42227,61932,95734,96234,932
MontgomeryCounty30,72830,65230,10428,28828,084
MorganCounty36,39736,61635,54732,91532,606
MoultrieCounty13,93014,28714,84614,52614,510
OgleCounty45,95751,03253,49751,78851,449
PeoriaCounty182,827183,433186,494181,830179,432
PerryCounty21,41223,09422,35020,94520,985
PiattCounty15,54816,36516,72916,67316,753
PikeCounty17,57717,38416,43014,73914,618
PopeCounty4,3734,4134,4703,7633,779
PulaskiCounty7,5237,3486,1615,1935,065
PutnamCounty5,7306,0866,0065,6375,566
RandolphCounty34,58333,89333,47630,16330,142
RichlandCounty16,54516,14916,23315,81315,796
Rock IslandCounty148,723149,374147,546144,672142,909
SalineCounty26,55126,73324,91323,76823,320
SangamonCounty178,386188,951197,465196,343194,734
SchuylerCounty7,4987,1897,5446,9026,843
ScottCounty5,6445,5375,3554,9494,836
ShelbyCounty22,26122,89322,36320,99020,789
StarkCounty6,5346,3325,9945,4005,294
St. ClairCounty262,852256,082270,056257,400254,796
StephensonCounty48,05248,97947,71144,63044,021
TazewellCounty123,692128,485135,394131,343130,413
UnionCounty17,61918,29317,80817,24416,923
VermilionCounty88,25783,91981,62574,18873,095
WabashCounty13,11112,93711,94711,36111,202
WarrenCounty19,18118,73517,70716,83516,531
WashingtonCounty14,96515,14814,71613,76113,655
WayneCounty17,24117,15116,76016,17915,963
WhiteCounty16,52215,37114,66513,87713,784
WhitesideCounty60,18660,65358,49855,69155,305
WillCounty357,313502,266677,560696,355697,252
WilliamsonCounty57,73361,29666,35767,15366,879
WinnebagoCounty252,913278,418295,266285,350283,119
WoodfordCounty32,65335,46938,66438,46738,225
USA [United States of America]Federal Republic248,709,873281,421,906308,745,538331,449,281331,893,745

Source: U.S. Census Bureau (web).

Explanation: All population totals refer to 2020 boundaries. The 2021 gender and age figures are not fully based on results of the 2020 census.

Further information about the population structure:

Gender (E 2021)
Males6,265,082
Females6,406,387
Age Groups (E 2021)
0-17 years2,803,224
18-64 years7,766,783
65+ years2,101,462
Age Distribution (E 2021)
0-9 years1,472,218
10-19 years1,657,075
20-29 years1,666,304
30-39 years1,718,561
40-49 years1,596,232
50-59 years1,638,750
60-69 years1,517,692
70-79 years926,203
80+ years478,434
»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:

USA: Counties