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

Counties in Illinois by population aged 18 to 64

Brown County had the highest population aged 18 to 64 of 102 counties in 2017, at 69%. Jo Daviess County had the lowest, at 54%. The median was 58.6% and the figure for Illinois was 62.4%. Source: the U.S. Census Bureau.

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Highest69Brown County
Lowest54Jo Daviess County
Median58.6102 counties
Illinois62.4History

Map of counties, 2017

Adams County: 57.9 %Alexander County: 55.9 %Bond County: 63.5 %Boone County: 59.1 %Brown County: 69 %Bureau County: 57.2 %Calhoun County: 55.5 %Carroll County: 58.2 %Cass County: 58.9 %Champaign County: 68.6 %Christian County: 60.2 %Clark County: 57.5 %Clay County: 57.1 %Clinton County: 61.5 %Coles County: 63.5 %Cook County: 64.4 %Crawford County: 60.4 %Cumberland County: 58 %DeKalb County: 64.6 %De Witt County: 59.1 %Douglas County: 56.9 %DuPage County: 62.2 %Edgar County: 57.6 %Edwards County: 56.8 %Effingham County: 59.2 %Fayette County: 61.2 %Ford County: 57.4 %Franklin County: 57.4 %Fulton County: 59.3 %Gallatin County: 55.4 %Greene County: 58.2 %Grundy County: 60.4 %Hamilton County: 56.1 %Hancock County: 56.1 %Hardin County: 54.7 %Henderson County: 56.6 %Henry County: 56.8 %Iroquois County: 56.7 %Jackson County: 65.6 %Jasper County: 57.9 %Jefferson County: 58.6 %Jersey County: 59.5 %Jo Daviess County: 54 %Johnson County: 62.1 %Kane County: 60.9 %Kankakee County: 60.3 %Kendall County: 60.7 %Knox County: 59.4 %Lake County: 61.9 %LaSalle County: 60 %Lawrence County: 62.8 %Lee County: 61.3 %Livingston County: 59.3 %Logan County: 61.9 %McDonough County: 64.1 %McHenry County: 62.2 %McLean County: 65 %Macon County: 58.5 %Macoupin County: 58.9 %Madison County: 61.5 %Marion County: 57.3 %Marshall County: 56.9 %Mason County: 57.3 %Massac County: 56.5 %Menard County: 58 %Mercer County: 56.8 %Monroe County: 60 %Montgomery County: 59.7 %Morgan County: 60.5 %Moultrie County: 55.1 %Ogle County: 59 %Peoria County: 60.1 %Perry County: 61.6 %Piatt County: 57.9 %Pike County: 56.6 %Pope County: 56.2 %Pulaski County: 56.7 %Putnam County: 58.4 %Randolph County: 61.2 %Richland County: 57 %Rock Island County: 59.3 %St. Clair County: 61.2 %Saline County: 57.3 %Sangamon County: 60.4 %Schuyler County: 59 %Scott County: 58.4 %Shelby County: 56.8 %Stark County: 56 %Stephenson County: 56.4 %Tazewell County: 58.6 %Union County: 58.4 %Vermilion County: 57.8 %Wabash County: 58.3 %Warren County: 58.6 %Washington County: 58.8 %Wayne County: 55.8 %White County: 56.2 %Whiteside County: 57.3 %Will County: 61.8 %Williamson County: 59.2 %Winnebago County: 60 %Woodford County: 57.3 %
  • Under 57
  • 57 to 59
  • 59 to 60
  • 60 to 62
  • 62 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2017

Brown County: 69 %Brown County69Champaign County: 68.6 %Champaign County68.6Jackson County: 65.6 %Jackson County65.6McLean County: 65 %McLean County65DeKalb County: 64.6 %DeKalb County64.6Cook County: 64.4 %Cook County64.4McDonough County: 64.1 %McDonough County64.1Coles County: 63.5 %Coles County63.5Bond County: 63.5 %Bond County63.5Lawrence County: 62.8 %Lawrence County62.8DuPage County: 62.2 %DuPage County62.2McHenry County: 62.2 %McHenry County62.2Johnson County: 62.1 %Johnson County62.1Lake County: 61.9 %Lake County61.9Logan County: 61.9 %Logan County61.9Will County: 61.8 %Will County61.8Perry County: 61.6 %Perry County61.6Clinton County: 61.5 %Clinton County61.5Madison County: 61.5 %Madison County61.5Lee County: 61.3 %Lee County61.3Randolph County: 61.2 %Randolph County61.2Fayette County: 61.2 %Fayette County61.2St. Clair County: 61.2 %St. Clair County61.2Kane County: 60.9 %Kane County60.9Kendall County: 60.7 %Kendall County60.7Morgan County: 60.5 %Morgan County60.5Grundy County: 60.4 %Grundy County60.4Sangamon County: 60.4 %Sangamon County60.4Crawford County: 60.4 %Crawford County60.4Kankakee County: 60.3 %Kankakee County60.3Christian County: 60.2 %Christian County60.2Peoria County: 60.1 %Peoria County60.1Monroe County: 60 %Monroe County60Winnebago County: 60 %Winnebago County60LaSalle County: 60 %LaSalle County60Montgomery County: 59.7 %Montgomery County59.7Jersey County: 59.5 %Jersey County59.5Knox County: 59.4 %Knox County59.4Fulton County: 59.3 %Fulton County59.3Livingston County: 59.3 %Livingston County59.3Brown County: 69 %Brown County69Champaign County: 68.6 %Champaign County68.6Jackson County: 65.6 %Jackson County65.6McLean County: 65 %McLean County65DeKalb County: 64.6 %DeKalb County64.6Cook County: 64.4 %Cook County64.4McDonough County: 64.1 %McDonough County64.1Coles County: 63.5 %Coles County63.5Bond County: 63.5 %Bond County63.5Lawrence County: 62.8 %Lawrence County62.8DuPage County: 62.2 %DuPage County62.2McHenry County: 62.2 %McHenry County62.2Johnson County: 62.1 %Johnson County62.1Lake County: 61.9 %Lake County61.9Logan County: 61.9 %Logan County61.9Will County: 61.8 %Will County61.8Perry County: 61.6 %Perry County61.6Clinton County: 61.5 %Clinton County61.5Madison County: 61.5 %Madison County61.5Lee County: 61.3 %Lee County61.3Randolph County: 61.2 %Randolph County61.2Fayette County: 61.2 %Fayette County61.2St. Clair County: 61.2 %St. Clair County61.2Kane County: 60.9 %Kane County60.9Kendall County: 60.7 %Kendall County60.7Morgan County: 60.5 %Morgan County60.5Grundy County: 60.4 %Grundy County60.4Sangamon County: 60.4 %Sangamon County60.4Crawford County: 60.4 %Crawford County60.4Kankakee County: 60.3 %Kankakee County60.3Christian County: 60.2 %Christian County60.2Peoria County: 60.1 %Peoria County60.1Monroe County: 60 %Monroe County60Winnebago County: 60 %Winnebago County60LaSalle County: 60 %LaSalle County60Montgomery County: 59.7 %Montgomery County59.7Jersey County: 59.5 %Jersey County59.5Knox County: 59.4 %Knox County59.4Fulton County: 59.3 %Fulton County59.3Livingston County: 59.3 %Livingston County59.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Brown County69-0.3 pts
2Champaign County68.6-0.6 pts
3Jackson County65.6-1 pts
4McLean County65-0.4 pts
5DeKalb County64.6-0.5 pts
6Cook County64.4-0.1 pts
7McDonough County64.1-0.9 pts
8Coles County63.5-0.8 pts
9Bond County63.5-0.2 pts
10Lawrence County62.8-0.4 pts
11DuPage County62.2-0.4 pts
12McHenry County62.2-0.2 pts
13Johnson County62.1-0.1 pts
14Lake County61.9-0.2 pts
15Logan County61.9-0.4 pts
16Will County61.8-0 pts
17Perry County61.6-0.4 pts
18Clinton County61.5-0.4 pts
19Madison County61.5-0.3 pts
20Lee County61.3-0.3 pts
21Randolph County61.2-0.6 pts
22Fayette County61.2-0.2 pts
23St. Clair County61.2-0.3 pts
24Kane County60.9-0.1 pts
25Kendall County60.70 pts
26Morgan County60.5-0.5 pts
27Grundy County60.4-0.3 pts
28Sangamon County60.4-0.4 pts
29Crawford County60.4-0.2 pts
30Kankakee County60.3-0.3 pts
31Christian County60.2-0.1 pts
32Peoria County60.1-0.4 pts
33Monroe County60-0.1 pts
34Winnebago County60-0.3 pts
35LaSalle County60-0.3 pts
36Montgomery County59.7-0.5 pts
37Jersey County59.5-0.4 pts
38Knox County59.4-0.5 pts
39Fulton County59.3-0.4 pts
40Livingston County59.3-0.3 pts
41Rock Island County59.3-0.4 pts
42Williamson County59.2-0.3 pts
43Effingham County59.2-0.2 pts
44Boone County59.1-0.1 pts
45De Witt County59.1-0.1 pts
46Ogle County59-0.2 pts
47Schuyler County59-0.3 pts
48Macoupin County58.9-0.2 pts
49Cass County58.9-0.5 pts
50Washington County58.8-0.7 pts
51Tazewell County58.6-0.4 pts
52Warren County58.6-0.3 pts
53Jefferson County58.6-0.6 pts
54Macon County58.5-0.4 pts
55Union County58.4-0.4 pts
56Putnam County58.4-0.7 pts
57Scott County58.4-0.4 pts
58Wabash County58.3+0.1 pts
59Greene County58.2-0.2 pts
60Carroll County58.2+0.1 pts
61Menard County58-0.6 pts
62Cumberland County58-0.5 pts
63Adams County57.9-0.2 pts
64Piatt County57.9-0.3 pts
65Jasper County57.9-0.3 pts
66Vermilion County57.8-0.3 pts
67Edgar County57.6-0.5 pts
68Clark County57.5-0.3 pts
69Franklin County57.4-0.4 pts
70Ford County57.4-0.1 pts
71Woodford County57.3-0.5 pts
72Mason County57.3-0.1 pts
73Saline County57.3-0.4 pts
74Whiteside County57.3-0.3 pts
75Marion County57.3-0.4 pts
76Bureau County57.2-0.3 pts
77Clay County57.1-0.4 pts
78Richland County57-0.4 pts
79Douglas County56.9-0.1 pts
80Marshall County56.9-0.4 pts
81Shelby County56.8-0.3 pts
82Mercer County56.8-0.2 pts
83Henry County56.8-0.5 pts
84Edwards County56.8-0.3 pts
85Pulaski County56.7-0.7 pts
86Iroquois County56.7-0.4 pts
87Pike County56.6-0.1 pts
88Henderson County56.6-0.1 pts
89Massac County56.5-0.3 pts
90Stephenson County56.4-0.4 pts
91White County56.2-0.1 pts
92Pope County56.2-0.4 pts
93Hancock County56.1-0.2 pts
94Hamilton County56.1-0.5 pts
95Stark County56-0.2 pts
96Alexander County55.9-0.7 pts
97Wayne County55.8-0.4 pts
98Calhoun County55.5-0 pts
99Gallatin County55.4-0.4 pts
100Moultrie County55.1-0.8 pts
101Hardin County54.7-0.4 pts
102Jo Daviess County54-0.8 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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/illinois-counties?period=2017.
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?

Brown County, with 69% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jo Daviess County, with 54% in 2017.

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