Data / Rankings / Households / Counties in Illinois

Counties in Illinois by households

Cook County had the highest households of 102 counties in 2021, at 2.04 million. Calhoun County had the lowest, at 1,272. The median was 10,515 and the figure for Illinois was 4.93 million. Source: the U.S. Census Bureau.

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Highest2,044,658Cook County
Lowest1,272Calhoun County
Median10,515102 counties
Illinois4,930,255History

Map of counties, 2021

Adams County: 27,174 countAlexander County: 1,781 countBond County: 6,094 countBoone County: 18,897 countBrown County: 1,998 countBureau County: 13,788 countCalhoun County: 1,272 countCarroll County: 6,299 countCass County: 4,983 countChampaign County: 81,835 countChristian County: 13,567 countClark County: 6,379 countClay County: 5,447 countClinton County: 14,255 countColes County: 20,269 countCook County: 2,044,658 countCrawford County: 7,512 countCumberland County: 4,126 countDeKalb County: 38,931 countDe Witt County: 6,635 countDouglas County: 7,585 countDuPage County: 347,385 countEdgar County: 7,544 countEdwards County: 2,656 countEffingham County: 14,104 countFayette County: 7,609 countFord County: 5,719 countFranklin County: 16,237 countFulton County: 13,893 countGallatin County: 2,133 countGreene County: 4,512 countGrundy County: 20,159 countHamilton County: 3,190 countHancock County: 7,368 countHardin County: 1,501 countHenderson County: 2,696 countHenry County: 20,109 countIroquois County: 11,242 countJackson County: 23,186 countJasper County: 3,745 countJefferson County: 14,608 countJersey County: 7,818 countJo Daviess County: 10,006 countJohnson County: 4,055 countKane County: 181,263 countKankakee County: 40,346 countKendall County: 43,225 countKnox County: 20,575 countLake County: 252,731 countLaSalle County: 44,873 countLawrence County: 5,449 countLee County: 13,508 countLivingston County: 14,431 countLogan County: 11,003 countMcDonough County: 11,247 countMcHenry County: 114,446 countMcLean County: 67,900 countMacon County: 43,264 countMacoupin County: 17,649 countMadison County: 108,237 countMarion County: 15,294 countMarshall County: 4,892 countMason County: 5,790 countMassac County: 5,466 countMenard County: 5,114 countMercer County: 6,339 countMonroe County: 13,479 countMontgomery County: 11,145 countMorgan County: 13,187 countMoultrie County: 5,753 countOgle County: 20,771 countPeoria County: 75,352 countPerry County: 8,108 countPiatt County: 6,686 countPike County: 5,756 countPope County: 1,372 countPulaski County: 1,857 countPutnam County: 2,298 countRandolph County: 11,538 countRichland County: 6,381 countRock Island County: 60,694 countSt. Clair County: 100,079 countSaline County: 10,026 countSangamon County: 84,630 countSchuyler County: 2,692 countScott County: 1,943 countShelby County: 8,768 countStark County: 2,262 countStephenson County: 19,253 countTazewell County: 53,719 countUnion County: 6,702 countVermilion County: 29,747 countWabash County: 4,731 countWarren County: 6,818 countWashington County: 5,811 countWayne County: 6,796 countWhite County: 5,690 countWhiteside County: 23,194 countWill County: 237,043 countWilliamson County: 28,057 countWinnebago County: 115,240 countWoodford County: 14,675 count
  • Under 10K
  • 10K to 20K
  • 20K to 40K
  • 40K and over
count, 2021. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25003: occupied housing units (households). Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Cook County: 2,044,658 countCook County2,044,658DuPage County: 347,385 countDuPage County347,385Lake County: 252,731 countLake County252,731Will County: 237,043 countWill County237,043Kane County: 181,263 countKane County181,263Winnebago County: 115,240 countWinnebago County115,240McHenry County: 114,446 countMcHenry County114,446Madison County: 108,237 countMadison County108,237St. Clair County: 100,079 countSt. Clair County100,079Sangamon County: 84,630 countSangamon County84,630Champaign County: 81,835 countChampaign County81,835Peoria County: 75,352 countPeoria County75,352McLean County: 67,900 countMcLean County67,900Rock Island County: 60,694 countRock Island County60,694Tazewell County: 53,719 countTazewell County53,719LaSalle County: 44,873 countLaSalle County44,873Macon County: 43,264 countMacon County43,264Kendall County: 43,225 countKendall County43,225Kankakee County: 40,346 countKankakee County40,346DeKalb County: 38,931 countDeKalb County38,931Vermilion County: 29,747 countVermilion County29,747Williamson County: 28,057 countWilliamson County28,057Adams County: 27,174 countAdams County27,174Whiteside County: 23,194 countWhiteside County23,194Jackson County: 23,186 countJackson County23,186Ogle County: 20,771 countOgle County20,771Knox County: 20,575 countKnox County20,575Coles County: 20,269 countColes County20,269Grundy County: 20,159 countGrundy County20,159Henry County: 20,109 countHenry County20,109Stephenson County: 19,253 countStephenson County19,253Boone County: 18,897 countBoone County18,897Macoupin County: 17,649 countMacoupin County17,649Franklin County: 16,237 countFranklin County16,237Marion County: 15,294 countMarion County15,294Woodford County: 14,675 countWoodford County14,675Jefferson County: 14,608 countJefferson County14,608Livingston County: 14,431 countLivingston County14,431Clinton County: 14,255 countClinton County14,255Effingham County: 14,104 countEffingham County14,104Cook County: 2,044,658 countCook County2,044,658DuPage County: 347,385 countDuPage County347,385Lake County: 252,731 countLake County252,731Will County: 237,043 countWill County237,043Kane County: 181,263 countKane County181,263Winnebago County: 115,240 countWinnebago County115,240McHenry County: 114,446 countMcHenry County114,446Madison County: 108,237 countMadison County108,237St. Clair County: 100,079 countSt. Clair County100,079Sangamon County: 84,630 countSangamon County84,630Champaign County: 81,835 countChampaign County81,835Peoria County: 75,352 countPeoria County75,352McLean County: 67,900 countMcLean County67,900Rock Island County: 60,694 countRock Island County60,694Tazewell County: 53,719 countTazewell County53,719LaSalle County: 44,873 countLaSalle County44,873Macon County: 43,264 countMacon County43,264Kendall County: 43,225 countKendall County43,225Kankakee County: 40,346 countKankakee County40,346DeKalb County: 38,931 countDeKalb County38,931Vermilion County: 29,747 countVermilion County29,747Williamson County: 28,057 countWilliamson County28,057Adams County: 27,174 countAdams County27,174Whiteside County: 23,194 countWhiteside County23,194Jackson County: 23,186 countJackson County23,186Ogle County: 20,771 countOgle County20,771Knox County: 20,575 countKnox County20,575Coles County: 20,269 countColes County20,269Grundy County: 20,159 countGrundy County20,159Henry County: 20,109 countHenry County20,109Stephenson County: 19,253 countStephenson County19,253Boone County: 18,897 countBoone County18,897Macoupin County: 17,649 countMacoupin County17,649Franklin County: 16,237 countFranklin County16,237Marion County: 15,294 countMarion County15,294Woodford County: 14,675 countWoodford County14,675Jefferson County: 14,608 countJefferson County14,608Livingston County: 14,431 countLivingston County14,431Clinton County: 14,255 countClinton County14,255Effingham County: 14,104 countEffingham County14,104
count. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25003: occupied housing units (households). Retrieved 2026-10-12.

Full ranking

RankCounties2021
count
1Cook County2,044,658
2DuPage County347,385
3Lake County252,731
4Will County237,043
5Kane County181,263
6Winnebago County115,240
7McHenry County114,446
8Madison County108,237
9St. Clair County100,079
10Sangamon County84,630
11Champaign County81,835
12Peoria County75,352
13McLean County67,900
14Rock Island County60,694
15Tazewell County53,719
16LaSalle County44,873
17Macon County43,264
18Kendall County43,225
19Kankakee County40,346
20DeKalb County38,931
21Vermilion County29,747
22Williamson County28,057
23Adams County27,174
24Whiteside County23,194
25Jackson County23,186
26Ogle County20,771
27Knox County20,575
28Coles County20,269
29Grundy County20,159
30Henry County20,109
31Stephenson County19,253
32Boone County18,897
33Macoupin County17,649
34Franklin County16,237
35Marion County15,294
36Woodford County14,675
37Jefferson County14,608
38Livingston County14,431
39Clinton County14,255
40Effingham County14,104
41Fulton County13,893
42Bureau County13,788
43Christian County13,567
44Lee County13,508
45Monroe County13,479
46Morgan County13,187
47Randolph County11,538
48McDonough County11,247
49Iroquois County11,242
50Montgomery County11,145
51Logan County11,003
52Saline County10,026
53Jo Daviess County10,006
54Shelby County8,768
55Perry County8,108
56Jersey County7,818
57Fayette County7,609
58Douglas County7,585
59Edgar County7,544
60Crawford County7,512
61Hancock County7,368
62Warren County6,818
63Wayne County6,796
64Union County6,702
65Piatt County6,686
66De Witt County6,635
67Richland County6,381
68Clark County6,379
69Mercer County6,339
70Carroll County6,299
71Bond County6,094
72Washington County5,811
73Mason County5,790
74Pike County5,756
75Moultrie County5,753
76Ford County5,719
77White County5,690
78Massac County5,466
79Lawrence County5,449
80Clay County5,447
81Menard County5,114
82Cass County4,983
83Marshall County4,892
84Wabash County4,731
85Greene County4,512
86Cumberland County4,126
87Johnson County4,055
88Jasper County3,745
89Hamilton County3,190
90Henderson County2,696
91Schuyler County2,692
92Edwards County2,656
93Putnam County2,298
94Stark County2,262
95Gallatin County2,133
96Brown County1,998
97Scott County1,943
98Pulaski County1,857
99Alexander County1,781
100Hardin County1,501
101Pope County1,372
102Calhoun County1,272

Other periods

About this ranking

Number of households, which equals the number of occupied housing units. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

People living in group quarters, such as college dormitories, nursing homes and prisons, are not in households.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B25003: occupied housing units (households). https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B25003: occupied housing units (households) (Counties in Illinois by households, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat

MLA 9

American Community Survey 5-year estimates, table B25003: occupied housing units (households), Counties in Illinois by households, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Invokely, https://invokely.ai/rankings/households/illinois-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B25003: occupied housing units (households). Counties in Illinois by households, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Also distributed by Invokely, https://invokely.ai/rankings/households/illinois-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B25003: occupied housing units (households), Counties in Illinois by households, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat, via Invokely: https://invokely.ai/rankings/households/illinois-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B25003: occupied housing units (households): Counties in Illinois by households, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/households/illinois-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25003: occupied housing units (households). https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B25003: occupied housing units (households): Counties in Illinois by households, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat
L2  - https://invokely.ai/rankings/households/illinois-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/households/illinois-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25003: occupied housing units (households). https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25003.dat. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest households?

Cook County, with 2.04 million in 2021, according to the U.S. Census Bureau.

Which county has the lowest households?

Calhoun County, with 1,272 in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B25003: occupied housing units (households). Retrieved 2026-10-12.

Households: other rankings

Counties in Illinois: more rankings