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

Counties in Iowa by population aged 18 to 64

Story County had the highest population aged 18 to 64 of 99 counties in 2022, at 69.7%. Davis County had the lowest, at 51.3%. The median was 54.7% and the figure for Iowa was 58.3%. Source: the U.S. Census Bureau.

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Highest69.7Story County
Lowest51.3Davis County
Median54.799 counties
Iowa58.3History

Map of counties, 2022

Adair County: 53.9 %Adams County: 54.2 %Allamakee County: 52.3 %Appanoose County: 54.2 %Audubon County: 52.2 %Benton County: 57.2 %Black Hawk County: 59.5 %Boone County: 56.8 %Bremer County: 56.2 %Buchanan County: 54.3 %Buena Vista County: 57.1 %Butler County: 52.2 %Calhoun County: 54.6 %Carroll County: 53.7 %Cass County: 53.1 %Cedar County: 56.3 %Cerro Gordo County: 55.2 %Cherokee County: 51.9 %Chickasaw County: 53.7 %Clarke County: 54.3 %Clay County: 54.1 %Clayton County: 52.6 %Clinton County: 55.9 %Crawford County: 54.8 %Dallas County: 60 %Davis County: 51.3 %Decatur County: 56.2 %Delaware County: 55 %Des Moines County: 55.9 %Dickinson County: 52.1 %Dubuque County: 57.8 %Emmet County: 54.5 %Fayette County: 54.9 %Floyd County: 53.6 %Franklin County: 53.4 %Fremont County: 52.9 %Greene County: 52.9 %Grundy County: 53.5 %Guthrie County: 53.5 %Hamilton County: 55.1 %Hancock County: 53 %Hardin County: 54.7 %Harrison County: 55.6 %Henry County: 58.9 %Howard County: 53.5 %Humboldt County: 54 %Ida County: 53.2 %Iowa County: 56.3 %Jackson County: 55.3 %Jasper County: 57.8 %Jefferson County: 52.3 %Johnson County: 66.8 %Jones County: 57.6 %Keokuk County: 54.1 %Kossuth County: 52.6 %Lee County: 55 %Linn County: 59.8 %Louisa County: 57.2 %Lucas County: 53.7 %Lyon County: 52.6 %Madison County: 55.8 %Mahaska County: 56.4 %Marion County: 56.5 %Marshall County: 54.9 %Mills County: 55.9 %Mitchell County: 52.3 %Monona County: 52.3 %Monroe County: 55.2 %Montgomery County: 54.2 %Muscatine County: 57.5 %O'Brien County: 53.7 %Osceola County: 55.4 %Page County: 55.9 %Palo Alto County: 53 %Plymouth County: 55.1 %Pocahontas County: 52.5 %Polk County: 61.1 %Pottawattamie County: 58 %Poweshiek County: 58.5 %Ringgold County: 51.5 %Sac County: 52.8 %Scott County: 58.8 %Shelby County: 53.5 %Sioux County: 56.1 %Story County: 69.7 %Tama County: 54.5 %Taylor County: 52.5 %Union County: 56 %Van Buren County: 51.5 %Wapello County: 57.1 %Warren County: 57.4 %Washington County: 54.2 %Wayne County: 51.6 %Webster County: 58.4 %Winnebago County: 56 %Winneshiek County: 57.5 %Woodbury County: 58.4 %Worth County: 54.7 %Wright County: 52.5 %
  • Under 53
  • 53 to 54
  • 54 to 55
  • 55 to 56
  • 56 to 57
  • 57 and over
%, 2022. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2022

Story County: 69.7 %Story County69.7Johnson County: 66.8 %Johnson County66.8Polk County: 61.1 %Polk County61.1Dallas County: 60 %Dallas County60Linn County: 59.8 %Linn County59.8Black Hawk County: 59.5 %Black Hawk County59.5Henry County: 58.9 %Henry County58.9Scott County: 58.8 %Scott County58.8Poweshiek County: 58.5 %Poweshiek County58.5Webster County: 58.4 %Webster County58.4Woodbury County: 58.4 %Woodbury County58.4Pottawattamie County: 58 %Pottawattamie County58Dubuque County: 57.8 %Dubuque County57.8Jasper County: 57.8 %Jasper County57.8Jones County: 57.6 %Jones County57.6Winneshiek County: 57.5 %Winneshiek County57.5Muscatine County: 57.5 %Muscatine County57.5Warren County: 57.4 %Warren County57.4Benton County: 57.2 %Benton County57.2Louisa County: 57.2 %Louisa County57.2Wapello County: 57.1 %Wapello County57.1Buena Vista County: 57.1 %Buena Vista County57.1Boone County: 56.8 %Boone County56.8Marion County: 56.5 %Marion County56.5Mahaska County: 56.4 %Mahaska County56.4Cedar County: 56.3 %Cedar County56.3Iowa County: 56.3 %Iowa County56.3Bremer County: 56.2 %Bremer County56.2Decatur County: 56.2 %Decatur County56.2Sioux County: 56.1 %Sioux County56.1Union County: 56 %Union County56Winnebago County: 56 %Winnebago County56Page County: 55.9 %Page County55.9Mills County: 55.9 %Mills County55.9Clinton County: 55.9 %Clinton County55.9Des Moines County: 55.9 %Des Moines County55.9Madison County: 55.8 %Madison County55.8Harrison County: 55.6 %Harrison County55.6Osceola County: 55.4 %Osceola County55.4Jackson County: 55.3 %Jackson County55.3Story County: 69.7 %Story County69.7Johnson County: 66.8 %Johnson County66.8Polk County: 61.1 %Polk County61.1Dallas County: 60 %Dallas County60Linn County: 59.8 %Linn County59.8Black Hawk County: 59.5 %Black Hawk County59.5Henry County: 58.9 %Henry County58.9Scott County: 58.8 %Scott County58.8Poweshiek County: 58.5 %Poweshiek County58.5Webster County: 58.4 %Webster County58.4Woodbury County: 58.4 %Woodbury County58.4Pottawattamie County: 58 %Pottawattamie County58Dubuque County: 57.8 %Dubuque County57.8Jasper County: 57.8 %Jasper County57.8Jones County: 57.6 %Jones County57.6Winneshiek County: 57.5 %Winneshiek County57.5Muscatine County: 57.5 %Muscatine County57.5Warren County: 57.4 %Warren County57.4Benton County: 57.2 %Benton County57.2Louisa County: 57.2 %Louisa County57.2Wapello County: 57.1 %Wapello County57.1Buena Vista County: 57.1 %Buena Vista County57.1Boone County: 56.8 %Boone County56.8Marion County: 56.5 %Marion County56.5Mahaska County: 56.4 %Mahaska County56.4Cedar County: 56.3 %Cedar County56.3Iowa County: 56.3 %Iowa County56.3Bremer County: 56.2 %Bremer County56.2Decatur County: 56.2 %Decatur County56.2Sioux County: 56.1 %Sioux County56.1Union County: 56 %Union County56Winnebago County: 56 %Winnebago County56Page County: 55.9 %Page County55.9Mills County: 55.9 %Mills County55.9Clinton County: 55.9 %Clinton County55.9Des Moines County: 55.9 %Des Moines County55.9Madison County: 55.8 %Madison County55.8Harrison County: 55.6 %Harrison County55.6Osceola County: 55.4 %Osceola County55.4Jackson County: 55.3 %Jackson County55.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Story County69.7-0.3 pts
2Johnson County66.8-0.1 pts
3Polk County61.1-0.1 pts
4Dallas County60-0.1 pts
5Linn County59.8-0.3 pts
6Black Hawk County59.5-0.4 pts
7Henry County58.9-0.2 pts
8Scott County58.8-0.3 pts
9Poweshiek County58.5-0.1 pts
10Webster County58.4-0.7 pts
11Woodbury County58.40 pts
12Pottawattamie County58-0.2 pts
13Dubuque County57.8-0.3 pts
14Jasper County57.8-0.5 pts
15Jones County57.6+0.1 pts
16Winneshiek County57.5-0.8 pts
17Muscatine County57.5-0.2 pts
18Warren County57.4-0.1 pts
19Benton County57.2-0.3 pts
20Louisa County57.2-0.2 pts
21Wapello County57.10 pts
22Buena Vista County57.1-0.2 pts
23Boone County56.8-0.2 pts
24Marion County56.5-0.2 pts
25Mahaska County56.4-0.1 pts
26Cedar County56.3-0.1 pts
27Iowa County56.3-0.5 pts
28Bremer County56.2-0.2 pts
29Decatur County56.2-0.5 pts
30Sioux County56.1-0.2 pts
31Union County56-0 pts
32Winnebago County56-0.4 pts
33Page County55.9-0 pts
34Mills County55.9-0.1 pts
35Clinton County55.9-0.7 pts
36Des Moines County55.9-0.3 pts
37Madison County55.8-0.3 pts
38Harrison County55.6-0 pts
39Osceola County55.4-0.3 pts
40Jackson County55.3-0.4 pts
41Monroe County55.2-0 pts
42Cerro Gordo County55.2-0.6 pts
43Hamilton County55.1-0.2 pts
44Plymouth County55.1-0.3 pts
45Lee County55-0.3 pts
46Delaware County55-0.4 pts
47Marshall County54.9-0.4 pts
48Fayette County54.9-0.5 pts
49Crawford County54.8-0.1 pts
50Hardin County54.7+0.3 pts
51Worth County54.7-0.4 pts
52Calhoun County54.6-0.5 pts
53Tama County54.5-0.5 pts
54Emmet County54.5-0.4 pts
55Clarke County54.3-0.7 pts
56Buchanan County54.3-0.3 pts
57Washington County54.2-0.4 pts
58Appanoose County54.2-0.1 pts
59Adams County54.2-0.5 pts
60Montgomery County54.2-0.2 pts
61Clay County54.1-0.4 pts
62Keokuk County54.1-0.1 pts
63Humboldt County54-0.3 pts
64Adair County53.9-0.4 pts
65Lucas County53.7-0.3 pts
66Carroll County53.7-0.2 pts
67O'Brien County53.7-0.7 pts
68Chickasaw County53.7-0.5 pts
69Floyd County53.6-0.4 pts
70Guthrie County53.5-0.9 pts
71Grundy County53.5-0.9 pts
72Shelby County53.5-0.5 pts
73Howard County53.5-0.3 pts
74Franklin County53.4-0.6 pts
75Ida County53.2-0.1 pts
76Cass County53.1-0.4 pts
77Hancock County53-0.3 pts
78Palo Alto County53-0.4 pts
79Fremont County52.9-1.2 pts
80Greene County52.9-0.6 pts
81Sac County52.8-0.4 pts
82Clayton County52.6-0.7 pts
83Kossuth County52.6-0.7 pts
84Lyon County52.6-0.2 pts
85Pocahontas County52.5-0.8 pts
86Wright County52.5-0.4 pts
87Taylor County52.5+0.3 pts
88Mitchell County52.3-0.4 pts
89Monona County52.3-0.6 pts
90Allamakee County52.3-0.8 pts
91Jefferson County52.3-0.7 pts
92Audubon County52.2-1 pts
93Butler County52.2-0.5 pts
94Dickinson County52.1-0.6 pts
95Cherokee County51.9-0.8 pts
96Wayne County51.6-0.3 pts
97Ringgold County51.5-0.6 pts
98Van Buren County51.5-1 pts
99Davis County51.3-0.2 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 Iowa by population aged 18 to 64, 2022) [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 Iowa by population aged 18 to 64, 2022. 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/iowa-counties?period=2022. 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 Iowa by population aged 18 to 64, 2022. 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/iowa-counties?period=2022.

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 Iowa by population aged 18 to 64, 2022 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/iowa-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_iowa_by_2022,
  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 Iowa by population aged 18 to 64, 2022}},
  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/iowa-counties?period=2022. 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 Iowa by population aged 18 to 64, 2022
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/iowa-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/iowa-counties?period=2022.
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 Iowa 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?

Story County, with 69.7% in 2022, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Davis County, with 51.3% in 2022.

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 Iowa: more rankings