Data / Rankings / Population aged 18 to 64 / Counties in Illinois

Counties in Illinois by population aged 18 to 64

Champaign County had the highest population aged 18 to 64 of 102 counties in 2023, at 66.8%. Hardin County had the lowest, at 50.8%. The median was 56.3% and the figure for Illinois was 60.9%. Source: the U.S. Census Bureau.

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Highest66.8Champaign County
Lowest50.8Hardin County
Median56.3102 counties
Illinois60.9History

Map of counties, 2023

Adams County: 56.2 %Alexander County: 53.6 %Bond County: 62 %Boone County: 58.8 %Brown County: 66.5 %Bureau County: 55.8 %Calhoun County: 53.3 %Carroll County: 57 %Cass County: 57.7 %Champaign County: 66.8 %Christian County: 58.7 %Clark County: 55.5 %Clay County: 54.6 %Clinton County: 58.4 %Coles County: 60.6 %Cook County: 63.4 %Crawford County: 58.4 %Cumberland County: 55.2 %DeKalb County: 62.6 %De Witt County: 57 %Douglas County: 55.7 %DuPage County: 60 %Edgar County: 54.7 %Edwards County: 55.2 %Effingham County: 56.3 %Fayette County: 59.4 %Ford County: 55.1 %Franklin County: 56.1 %Fulton County: 57.6 %Gallatin County: 54.4 %Greene County: 55.2 %Grundy County: 59.9 %Hamilton County: 54.6 %Hancock County: 53 %Hardin County: 50.8 %Henderson County: 52.9 %Henry County: 55 %Iroquois County: 54.7 %Jackson County: 62.2 %Jasper County: 54.3 %Jefferson County: 56.6 %Jersey County: 57 %Jo Daviess County: 51.8 %Johnson County: 62.5 %Kane County: 60.3 %Kankakee County: 58.4 %Kendall County: 61.4 %Knox County: 56.7 %Lake County: 60.6 %LaSalle County: 57.7 %Lawrence County: 58.2 %Lee County: 58.5 %Livingston County: 56.7 %Logan County: 59.2 %McDonough County: 60.8 %McHenry County: 60.3 %McLean County: 63.5 %Macon County: 55.8 %Macoupin County: 56.3 %Madison County: 59.4 %Marion County: 54.8 %Marshall County: 54.6 %Mason County: 56.1 %Massac County: 56 %Menard County: 56 %Mercer County: 55.8 %Monroe County: 56.7 %Montgomery County: 57.4 %Morgan County: 59 %Moultrie County: 53.7 %Ogle County: 57.3 %Peoria County: 57.6 %Perry County: 59.9 %Piatt County: 55.3 %Pike County: 53.6 %Pope County: 53.5 %Pulaski County: 55.4 %Putnam County: 56 %Randolph County: 58.4 %Richland County: 55.6 %Rock Island County: 56.8 %St. Clair County: 58.8 %Saline County: 55.6 %Sangamon County: 58.2 %Schuyler County: 55.9 %Scott County: 55.4 %Shelby County: 54.1 %Stark County: 54.6 %Stephenson County: 53.9 %Tazewell County: 57.2 %Union County: 55.9 %Vermilion County: 55.9 %Wabash County: 54.9 %Warren County: 56.4 %Washington County: 55.9 %Wayne County: 54.7 %White County: 54.6 %Whiteside County: 55 %Will County: 61.2 %Williamson County: 57.6 %Winnebago County: 58 %Woodford County: 55.4 %
  • Under 55
  • 55 to 56
  • 56 to 58
  • 58 to 60
  • 60 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2023

Champaign County: 66.8 %Champaign County66.8Brown County: 66.5 %Brown County66.5McLean County: 63.5 %McLean County63.5Cook County: 63.4 %Cook County63.4DeKalb County: 62.6 %DeKalb County62.6Johnson County: 62.5 %Johnson County62.5Jackson County: 62.2 %Jackson County62.2Bond County: 62 %Bond County62Kendall County: 61.4 %Kendall County61.4Will County: 61.2 %Will County61.2McDonough County: 60.8 %McDonough County60.8Coles County: 60.6 %Coles County60.6Lake County: 60.6 %Lake County60.6McHenry County: 60.3 %McHenry County60.3Kane County: 60.3 %Kane County60.3DuPage County: 60 %DuPage County60Grundy County: 59.9 %Grundy County59.9Perry County: 59.9 %Perry County59.9Fayette County: 59.4 %Fayette County59.4Madison County: 59.4 %Madison County59.4Logan County: 59.2 %Logan County59.2Morgan County: 59 %Morgan County59St. Clair County: 58.8 %St. Clair County58.8Boone County: 58.8 %Boone County58.8Christian County: 58.7 %Christian County58.7Lee County: 58.5 %Lee County58.5Crawford County: 58.4 %Crawford County58.4Randolph County: 58.4 %Randolph County58.4Kankakee County: 58.4 %Kankakee County58.4Clinton County: 58.4 %Clinton County58.4Lawrence County: 58.2 %Lawrence County58.2Sangamon County: 58.2 %Sangamon County58.2Winnebago County: 58 %Winnebago County58Cass County: 57.7 %Cass County57.7LaSalle County: 57.7 %LaSalle County57.7Fulton County: 57.6 %Fulton County57.6Williamson County: 57.6 %Williamson County57.6Peoria County: 57.6 %Peoria County57.6Montgomery County: 57.4 %Montgomery County57.4Ogle County: 57.3 %Ogle County57.3Champaign County: 66.8 %Champaign County66.8Brown County: 66.5 %Brown County66.5McLean County: 63.5 %McLean County63.5Cook County: 63.4 %Cook County63.4DeKalb County: 62.6 %DeKalb County62.6Johnson County: 62.5 %Johnson County62.5Jackson County: 62.2 %Jackson County62.2Bond County: 62 %Bond County62Kendall County: 61.4 %Kendall County61.4Will County: 61.2 %Will County61.2McDonough County: 60.8 %McDonough County60.8Coles County: 60.6 %Coles County60.6Lake County: 60.6 %Lake County60.6McHenry County: 60.3 %McHenry County60.3Kane County: 60.3 %Kane County60.3DuPage County: 60 %DuPage County60Grundy County: 59.9 %Grundy County59.9Perry County: 59.9 %Perry County59.9Fayette County: 59.4 %Fayette County59.4Madison County: 59.4 %Madison County59.4Logan County: 59.2 %Logan County59.2Morgan County: 59 %Morgan County59St. Clair County: 58.8 %St. Clair County58.8Boone County: 58.8 %Boone County58.8Christian County: 58.7 %Christian County58.7Lee County: 58.5 %Lee County58.5Crawford County: 58.4 %Crawford County58.4Randolph County: 58.4 %Randolph County58.4Kankakee County: 58.4 %Kankakee County58.4Clinton County: 58.4 %Clinton County58.4Lawrence County: 58.2 %Lawrence County58.2Sangamon County: 58.2 %Sangamon County58.2Winnebago County: 58 %Winnebago County58Cass County: 57.7 %Cass County57.7LaSalle County: 57.7 %LaSalle County57.7Fulton County: 57.6 %Fulton County57.6Williamson County: 57.6 %Williamson County57.6Peoria County: 57.6 %Peoria County57.6Montgomery County: 57.4 %Montgomery County57.4Ogle County: 57.3 %Ogle County57.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Champaign County66.8-0.1 pts
2Brown County66.5-0.1 pts
3McLean County63.5-0.1 pts
4Cook County63.4-0 pts
5DeKalb County62.6-0.1 pts
6Johnson County62.5-0.2 pts
7Jackson County62.2-0.3 pts
8Bond County62-0.3 pts
9Kendall County61.4+0.1 pts
10Will County61.2-0.2 pts
11McDonough County60.8-0.2 pts
12Coles County60.6-0.3 pts
13Lake County60.6-0.3 pts
14McHenry County60.3-0.4 pts
15Kane County60.3-0 pts
16DuPage County60-0.3 pts
17Grundy County59.90 pts
18Perry County59.9-0.3 pts
19Fayette County59.4-0.3 pts
20Madison County59.4-0.3 pts
21Logan County59.2-0.3 pts
22Morgan County59-0.8 pts
23St. Clair County58.8-0.2 pts
24Boone County58.8-0.2 pts
25Christian County58.7-0.3 pts
26Lee County58.5-0.4 pts
27Crawford County58.4+0.2 pts
28Randolph County58.4-0.5 pts
29Kankakee County58.4-0.4 pts
30Clinton County58.4-0.5 pts
31Lawrence County58.2+0.4 pts
32Sangamon County58.2-0.2 pts
33Winnebago County58-0.3 pts
34Cass County57.7-0 pts
35LaSalle County57.7-0.6 pts
36Fulton County57.6-0.2 pts
37Williamson County57.6-0 pts
38Peoria County57.6-0.4 pts
39Montgomery County57.4-0.4 pts
40Ogle County57.3-0.4 pts
41Tazewell County57.2-0.1 pts
42Jersey County57-0.6 pts
43Carroll County57-0.4 pts
44De Witt County57-0.6 pts
45Rock Island County56.8-0.2 pts
46Livingston County56.7-0.7 pts
47Monroe County56.7-0.5 pts
48Knox County56.7-0.6 pts
49Jefferson County56.6-0.5 pts
50Warren County56.4-0.3 pts
51Macoupin County56.3-0.4 pts
52Effingham County56.3-0.4 pts
53Adams County56.2-0.2 pts
54Mason County56.1-0.2 pts
55Franklin County56.1-0.2 pts
56Putnam County56-1.3 pts
57Menard County56-0.6 pts
58Massac County56-0 pts
59Union County55.9-0.3 pts
60Vermilion County55.9-0.2 pts
61Schuyler County55.9-0.6 pts
62Washington County55.9-0.2 pts
63Bureau County55.8-0.3 pts
64Mercer County55.8-0.3 pts
65Macon County55.8-0.4 pts
66Douglas County55.7-0.2 pts
67Richland County55.60 pts
68Saline County55.6-0.1 pts
69Clark County55.5-0.3 pts
70Woodford County55.4-0.1 pts
71Scott County55.4-0.7 pts
72Pulaski County55.4-0.4 pts
73Piatt County55.3-0.5 pts
74Greene County55.2-0.5 pts
75Edwards County55.2+0.1 pts
76Cumberland County55.2-0.3 pts
77Ford County55.1-0.3 pts
78Henry County55-0.3 pts
79Whiteside County55-0.4 pts
80Wabash County54.9-0.2 pts
81Marion County54.8-0.4 pts
82Iroquois County54.7-0.4 pts
83Edgar County54.7-0.3 pts
84Wayne County54.7-0.4 pts
85Clay County54.6-0.5 pts
86Stark County54.6-0.1 pts
87Marshall County54.6-0.3 pts
88Hamilton County54.6-0.4 pts
89White County54.6-0.1 pts
90Gallatin County54.4-0.3 pts
91Jasper County54.3-0.7 pts
92Shelby County54.1-0.5 pts
93Stephenson County53.9-0.4 pts
94Moultrie County53.7-0.2 pts
95Pike County53.6-0.4 pts
96Alexander County53.6-0.6 pts
97Pope County53.5+0.2 pts
98Calhoun County53.3-0.1 pts
99Hancock County53-0.6 pts
100Henderson County52.9-0.6 pts
101Jo Daviess County51.8-0.5 pts
102Hardin County50.8-0.8 pts

Other periods

About this ranking

Residents aged 18 to 64 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Not comparable with working-age shares for ages 15 to 64 used in EU and World Bank statistics.

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. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. 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). Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in Illinois by population aged 18 to 64, 2023) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Illinois by population aged 18 to 64, 2023. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-18-64/illinois-counties?period=2023. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in Illinois by population aged 18 to 64, 2023. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-18-64/illinois-counties?period=2023.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Illinois by population aged 18 to 64, 2023 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/illinois-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2023,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Illinois by population aged 18 to 64, 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population-18-64/illinois-counties?period=2023. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Illinois by population aged 18 to 64, 2023
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/population-18-64/illinois-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/illinois-counties?period=2023.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Rank Counties in Illinois by population aged 18 to 64 using official data, and cite the source.
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Questions

Which county has the highest population aged 18 to 64?

Champaign County, with 66.8% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Hardin County, with 50.8% in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population aged 18 to 64: other rankings

Counties in Illinois: more rankings