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 2014, at 70.7%. Hardin County had the lowest, at 55.3%. The median was 59.7% and the figure for Illinois was 62.9%. Source: the U.S. Census Bureau.

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Highest70.7Brown County
Lowest55.3Hardin County
Median59.7102 counties
Illinois62.9History

Map of counties, 2014

Adams County: 58.8 %Alexander County: 56.9 %Bond County: 64.2 %Boone County: 59.6 %Brown County: 70.7 %Bureau County: 58.3 %Calhoun County: 56.5 %Carroll County: 58.5 %Cass County: 59.7 %Champaign County: 69.8 %Christian County: 60.3 %Clark County: 58.6 %Clay County: 58 %Clinton County: 62.5 %Coles County: 65.7 %Cook County: 64.6 %Crawford County: 61.5 %Cumberland County: 59.1 %DeKalb County: 66.1 %De Witt County: 60.1 %Douglas County: 57.6 %DuPage County: 63.1 %Edgar County: 58.2 %Edwards County: 57.7 %Effingham County: 59.8 %Fayette County: 61.7 %Ford County: 57.6 %Franklin County: 58.3 %Fulton County: 60.5 %Gallatin County: 57.1 %Greene County: 58.9 %Grundy County: 61.2 %Hamilton County: 57.2 %Hancock County: 57 %Hardin County: 55.3 %Henderson County: 57.1 %Henry County: 58.1 %Iroquois County: 57.3 %Jackson County: 68.3 %Jasper County: 58.7 %Jefferson County: 60.6 %Jersey County: 60.4 %Jo Daviess County: 56.2 %Johnson County: 64 %Kane County: 61.2 %Kankakee County: 60.9 %Kendall County: 60.8 %Knox County: 60.7 %Lake County: 62.2 %LaSalle County: 60.7 %Lawrence County: 63.8 %Lee County: 62.3 %Livingston County: 60.7 %Logan County: 63.3 %McDonough County: 67 %McHenry County: 62.7 %McLean County: 66.3 %Macon County: 59.8 %Macoupin County: 59.7 %Madison County: 62.2 %Marion County: 58.3 %Marshall County: 58.1 %Mason County: 58.1 %Massac County: 57.9 %Menard County: 59.3 %Mercer County: 57.5 %Monroe County: 61.1 %Montgomery County: 60.9 %Morgan County: 61.5 %Moultrie County: 56.5 %Ogle County: 59.6 %Peoria County: 61.2 %Perry County: 62.8 %Piatt County: 59.3 %Pike County: 58 %Pope County: 58.8 %Pulaski County: 58.4 %Putnam County: 60.4 %Randolph County: 62.8 %Richland County: 57.9 %Rock Island County: 60.2 %St. Clair County: 62.1 %Saline County: 58.5 %Sangamon County: 61.6 %Schuyler County: 60 %Scott County: 59.5 %Shelby County: 57.9 %Stark County: 56.8 %Stephenson County: 57.8 %Tazewell County: 59.7 %Union County: 59.5 %Vermilion County: 58.7 %Wabash County: 59.2 %Warren County: 59.7 %Washington County: 60.6 %Wayne County: 57.2 %White County: 56.4 %Whiteside County: 58.3 %Will County: 62 %Williamson County: 60.5 %Winnebago County: 60.7 %Woodford County: 58.6 %
  • Under 58
  • 58 to 59
  • 59 to 60
  • 60 to 61
  • 61 to 62
  • 62 and over
%, 2014. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2014

Brown County: 70.7 %Brown County70.7Champaign County: 69.8 %Champaign County69.8Jackson County: 68.3 %Jackson County68.3McDonough County: 67 %McDonough County67McLean County: 66.3 %McLean County66.3DeKalb County: 66.1 %DeKalb County66.1Coles County: 65.7 %Coles County65.7Cook County: 64.6 %Cook County64.6Bond County: 64.2 %Bond County64.2Johnson County: 64 %Johnson County64Lawrence County: 63.8 %Lawrence County63.8Logan County: 63.3 %Logan County63.3DuPage County: 63.1 %DuPage County63.1Randolph County: 62.8 %Randolph County62.8Perry County: 62.8 %Perry County62.8McHenry County: 62.7 %McHenry County62.7Clinton County: 62.5 %Clinton County62.5Lee County: 62.3 %Lee County62.3Lake County: 62.2 %Lake County62.2Madison County: 62.2 %Madison County62.2St. Clair County: 62.1 %St. Clair County62.1Will County: 62 %Will County62Fayette County: 61.7 %Fayette County61.7Sangamon County: 61.6 %Sangamon County61.6Morgan County: 61.5 %Morgan County61.5Crawford County: 61.5 %Crawford County61.5Kane County: 61.2 %Kane County61.2Peoria County: 61.2 %Peoria County61.2Grundy County: 61.2 %Grundy County61.2Monroe County: 61.1 %Monroe County61.1Montgomery County: 60.9 %Montgomery County60.9Kankakee County: 60.9 %Kankakee County60.9Kendall County: 60.8 %Kendall County60.8Livingston County: 60.7 %Livingston County60.7Winnebago County: 60.7 %Winnebago County60.7LaSalle County: 60.7 %LaSalle County60.7Knox County: 60.7 %Knox County60.7Jefferson County: 60.6 %Jefferson County60.6Washington County: 60.6 %Washington County60.6Fulton County: 60.5 %Fulton County60.5Brown County: 70.7 %Brown County70.7Champaign County: 69.8 %Champaign County69.8Jackson County: 68.3 %Jackson County68.3McDonough County: 67 %McDonough County67McLean County: 66.3 %McLean County66.3DeKalb County: 66.1 %DeKalb County66.1Coles County: 65.7 %Coles County65.7Cook County: 64.6 %Cook County64.6Bond County: 64.2 %Bond County64.2Johnson County: 64 %Johnson County64Lawrence County: 63.8 %Lawrence County63.8Logan County: 63.3 %Logan County63.3DuPage County: 63.1 %DuPage County63.1Randolph County: 62.8 %Randolph County62.8Perry County: 62.8 %Perry County62.8McHenry County: 62.7 %McHenry County62.7Clinton County: 62.5 %Clinton County62.5Lee County: 62.3 %Lee County62.3Lake County: 62.2 %Lake County62.2Madison County: 62.2 %Madison County62.2St. Clair County: 62.1 %St. Clair County62.1Will County: 62 %Will County62Fayette County: 61.7 %Fayette County61.7Sangamon County: 61.6 %Sangamon County61.6Morgan County: 61.5 %Morgan County61.5Crawford County: 61.5 %Crawford County61.5Kane County: 61.2 %Kane County61.2Peoria County: 61.2 %Peoria County61.2Grundy County: 61.2 %Grundy County61.2Monroe County: 61.1 %Monroe County61.1Montgomery County: 60.9 %Montgomery County60.9Kankakee County: 60.9 %Kankakee County60.9Kendall County: 60.8 %Kendall County60.8Livingston County: 60.7 %Livingston County60.7Winnebago County: 60.7 %Winnebago County60.7LaSalle County: 60.7 %LaSalle County60.7Knox County: 60.7 %Knox County60.7Jefferson County: 60.6 %Jefferson County60.6Washington County: 60.6 %Washington County60.6Fulton County: 60.5 %Fulton County60.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2014 (%)Change on 2013
1Brown County70.7-0.4 pts
2Champaign County69.8-0.2 pts
3Jackson County68.3-0.8 pts
4McDonough County67-0.8 pts
5McLean County66.3-0.4 pts
6DeKalb County66.1-0.4 pts
7Coles County65.7-0.7 pts
8Cook County64.6-0 pts
9Bond County64.2-0.1 pts
10Johnson County64-0 pts
11Lawrence County63.8-0.1 pts
12Logan County63.3-0.4 pts
13DuPage County63.1-0.2 pts
14Randolph County62.8-0.6 pts
15Perry County62.8-0.1 pts
16McHenry County62.7-0.1 pts
17Clinton County62.5-0.3 pts
18Lee County62.3-0.3 pts
19Lake County62.2-0.1 pts
20Madison County62.2-0.3 pts
21St. Clair County62.1-0.1 pts
22Will County620 pts
23Fayette County61.7-0.1 pts
24Sangamon County61.6-0.4 pts
25Morgan County61.5-0.2 pts
26Crawford County61.5-0.1 pts
27Kane County61.2-0 pts
28Peoria County61.2-0.4 pts
29Grundy County61.2-0 pts
30Monroe County61.1-0.2 pts
31Montgomery County60.9+0.2 pts
32Kankakee County60.9-0.2 pts
33Kendall County60.8-0.2 pts
34Livingston County60.7-0.1 pts
35Winnebago County60.7-0.1 pts
36LaSalle County60.7-0.1 pts
37Knox County60.7-0.3 pts
38Jefferson County60.6-0.3 pts
39Washington County60.6-0 pts
40Fulton County60.5-0.1 pts
41Williamson County60.5-0.3 pts
42Jersey County60.4-0.4 pts
42Putnam County60.4-0.3 pts
44Christian County60.3-0 pts
45Rock Island County60.2-0.4 pts
46De Witt County60.1-0 pts
47Schuyler County60-0.4 pts
48Macon County59.8-0.5 pts
49Effingham County59.8-0.2 pts
50Tazewell County59.7-0.4 pts
51Macoupin County59.7-0.2 pts
52Warren County59.7-0.2 pts
53Cass County59.7+0.1 pts
54Ogle County59.6-0.1 pts
55Boone County59.6-0.1 pts
56Union County59.5-0.7 pts
57Scott County59.5+0.1 pts
58Menard County59.3-0.6 pts
59Piatt County59.3-0.2 pts
60Wabash County59.2-0.4 pts
61Cumberland County59.1-0.3 pts
62Greene County58.9-0.5 pts
63Adams County58.8-0.4 pts
64Pope County58.8-1.2 pts
65Jasper County58.7-0.2 pts
66Vermilion County58.7-0.3 pts
67Woodford County58.6-0.3 pts
68Clark County58.6-0.2 pts
69Carroll County58.5+0.1 pts
70Saline County58.5-0 pts
71Pulaski County58.4-0.1 pts
72Marion County58.3-0.4 pts
73Bureau County58.3-0.2 pts
73Franklin County58.3-0.3 pts
75Whiteside County58.3-0.3 pts
76Edgar County58.2-0.3 pts
77Marshall County58.1+0.1 pts
78Mason County58.1-0.5 pts
79Henry County58.1-0.2 pts
80Clay County58-0.3 pts
81Pike County58-0.1 pts
82Richland County57.9-0.3 pts
83Shelby County57.9-0.3 pts
84Massac County57.9-0.4 pts
85Stephenson County57.8-0.4 pts
86Edwards County57.7-0.7 pts
87Douglas County57.6-0.2 pts
88Ford County57.60 pts
89Mercer County57.5-0.4 pts
90Iroquois County57.3-0.2 pts
91Wayne County57.2-0.1 pts
92Hamilton County57.2-0.1 pts
93Henderson County57.1-0.5 pts
94Gallatin County57.1-0.6 pts
95Hancock County57-0.6 pts
96Alexander County56.9-0.3 pts
97Stark County56.8+0.2 pts
98Moultrie County56.5-0.4 pts
99Calhoun County56.5-0.4 pts
100White County56.4-0.3 pts
101Jo Daviess County56.2-0.5 pts
102Hardin County55.3-1 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, 2014) [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, 2014. 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=2014. 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, 2014. 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=2014.

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, 2014 [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=2014 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2014,
  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, 2014}},
  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=2014. 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, 2014
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=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/illinois-counties?period=2014.
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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Questions

Which county has the highest population aged 18 to 64?

Brown County, with 70.7% in 2014, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Hardin County, with 55.3% in 2014.

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