Data / Rankings / Population under 18 / Counties in Iowa

Counties in Iowa by population under 18

Dallas County had the highest population under 18 of 99 counties in 2014, at 29%. Story County had the lowest, at 17.3%. The median was 23.1% and the figure for Iowa was 23.5%. Source: the U.S. Census Bureau.

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Highest29Dallas County
Lowest17.3Story County
Median23.199 counties
Iowa23.5History

Map of counties, 2014

Adair County: 21.9 %Adams County: 21.4 %Allamakee County: 22.5 %Appanoose County: 22.2 %Audubon County: 20.4 %Benton County: 24.1 %Black Hawk County: 21.7 %Boone County: 23.5 %Bremer County: 22.3 %Buchanan County: 26.9 %Buena Vista County: 25.4 %Butler County: 23.5 %Calhoun County: 20.6 %Carroll County: 24.1 %Cass County: 22.3 %Cedar County: 23.4 %Cerro Gordo County: 20.4 %Cherokee County: 21.1 %Chickasaw County: 23.8 %Clarke County: 24.1 %Clay County: 22.9 %Clayton County: 22.3 %Clinton County: 22.9 %Crawford County: 26.4 %Dallas County: 29 %Davis County: 28.8 %Decatur County: 22.3 %Delaware County: 24.1 %Des Moines County: 22.9 %Dickinson County: 19.2 %Dubuque County: 23.1 %Emmet County: 22.5 %Fayette County: 21.2 %Floyd County: 23.2 %Franklin County: 23.3 %Fremont County: 22.1 %Greene County: 23 %Grundy County: 23.8 %Guthrie County: 22.9 %Hamilton County: 23.3 %Hancock County: 22.9 %Hardin County: 22.5 %Harrison County: 22.9 %Henry County: 22.4 %Howard County: 25 %Humboldt County: 23 %Ida County: 23.3 %Iowa County: 23.4 %Jackson County: 22.2 %Jasper County: 22.6 %Jefferson County: 17.5 %Johnson County: 20.7 %Jones County: 21.8 %Keokuk County: 23.5 %Kossuth County: 21.5 %Lee County: 21.7 %Linn County: 24 %Louisa County: 23.9 %Lucas County: 23.6 %Lyon County: 28.5 %Madison County: 26.4 %Mahaska County: 23.9 %Marion County: 24.1 %Marshall County: 25.2 %Mills County: 24.6 %Mitchell County: 24.2 %Monona County: 21.4 %Monroe County: 24 %Montgomery County: 22.7 %Muscatine County: 25.3 %O'Brien County: 23.3 %Osceola County: 23 %Page County: 21.3 %Palo Alto County: 21.8 %Plymouth County: 25.3 %Pocahontas County: 22.5 %Polk County: 25.3 %Pottawattamie County: 23.7 %Poweshiek County: 20.1 %Ringgold County: 23.1 %Sac County: 22.2 %Scott County: 24.2 %Shelby County: 22.5 %Sioux County: 27.5 %Story County: 17.3 %Tama County: 24.2 %Taylor County: 23.2 %Union County: 23.2 %Van Buren County: 23.6 %Wapello County: 22.9 %Warren County: 25.7 %Washington County: 24.9 %Wayne County: 24.4 %Webster County: 21.5 %Winnebago County: 21.2 %Winneshiek County: 19.3 %Woodbury County: 26.3 %Worth County: 22.6 %Wright County: 23.4 %
  • Under 22
  • 22 to 23
  • 23 to 24
  • 24 to 25
  • 25 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

Dallas County: 29 %Dallas County29Davis County: 28.8 %Davis County28.8Lyon County: 28.5 %Lyon County28.5Sioux County: 27.5 %Sioux County27.5Buchanan County: 26.9 %Buchanan County26.9Madison County: 26.4 %Madison County26.4Crawford County: 26.4 %Crawford County26.4Woodbury County: 26.3 %Woodbury County26.3Warren County: 25.7 %Warren County25.7Buena Vista County: 25.4 %Buena Vista County25.4Muscatine County: 25.3 %Muscatine County25.3Plymouth County: 25.3 %Plymouth County25.3Polk County: 25.3 %Polk County25.3Marshall County: 25.2 %Marshall County25.2Howard County: 25 %Howard County25Washington County: 24.9 %Washington County24.9Mills County: 24.6 %Mills County24.6Wayne County: 24.4 %Wayne County24.4Mitchell County: 24.2 %Mitchell County24.2Tama County: 24.2 %Tama County24.2Scott County: 24.2 %Scott County24.2Benton County: 24.1 %Benton County24.1Carroll County: 24.1 %Carroll County24.1Clarke County: 24.1 %Clarke County24.1Marion County: 24.1 %Marion County24.1Delaware County: 24.1 %Delaware County24.1Linn County: 24 %Linn County24Monroe County: 24 %Monroe County24Mahaska County: 23.9 %Mahaska County23.9Louisa County: 23.9 %Louisa County23.9Grundy County: 23.8 %Grundy County23.8Chickasaw County: 23.8 %Chickasaw County23.8Pottawattamie County: 23.7 %Pottawattamie County23.7Lucas County: 23.6 %Lucas County23.6Van Buren County: 23.6 %Van Buren County23.6Boone County: 23.5 %Boone County23.5Butler County: 23.5 %Butler County23.5Keokuk County: 23.5 %Keokuk County23.5Iowa County: 23.4 %Iowa County23.4Wright County: 23.4 %Wright County23.4Dallas County: 29 %Dallas County29Davis County: 28.8 %Davis County28.8Lyon County: 28.5 %Lyon County28.5Sioux County: 27.5 %Sioux County27.5Buchanan County: 26.9 %Buchanan County26.9Madison County: 26.4 %Madison County26.4Crawford County: 26.4 %Crawford County26.4Woodbury County: 26.3 %Woodbury County26.3Warren County: 25.7 %Warren County25.7Buena Vista County: 25.4 %Buena Vista County25.4Muscatine County: 25.3 %Muscatine County25.3Plymouth County: 25.3 %Plymouth County25.3Polk County: 25.3 %Polk County25.3Marshall County: 25.2 %Marshall County25.2Howard County: 25 %Howard County25Washington County: 24.9 %Washington County24.9Mills County: 24.6 %Mills County24.6Wayne County: 24.4 %Wayne County24.4Mitchell County: 24.2 %Mitchell County24.2Tama County: 24.2 %Tama County24.2Scott County: 24.2 %Scott County24.2Benton County: 24.1 %Benton County24.1Carroll County: 24.1 %Carroll County24.1Clarke County: 24.1 %Clarke County24.1Marion County: 24.1 %Marion County24.1Delaware County: 24.1 %Delaware County24.1Linn County: 24 %Linn County24Monroe County: 24 %Monroe County24Mahaska County: 23.9 %Mahaska County23.9Louisa County: 23.9 %Louisa County23.9Grundy County: 23.8 %Grundy County23.8Chickasaw County: 23.8 %Chickasaw County23.8Pottawattamie County: 23.7 %Pottawattamie County23.7Lucas County: 23.6 %Lucas County23.6Van Buren County: 23.6 %Van Buren County23.6Boone County: 23.5 %Boone County23.5Butler County: 23.5 %Butler County23.5Keokuk County: 23.5 %Keokuk County23.5Iowa County: 23.4 %Iowa County23.4Wright County: 23.4 %Wright County23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2014 (%)Change on 2013
1Dallas County29-0 pts
2Davis County28.8-0.3 pts
3Lyon County28.5+0.4 pts
4Sioux County27.5+0.1 pts
5Buchanan County26.9+0.4 pts
6Madison County26.4-0.1 pts
7Crawford County26.4-0.2 pts
8Woodbury County26.3-0 pts
9Warren County25.7-0 pts
10Buena Vista County25.4+0.1 pts
11Muscatine County25.3-0.1 pts
12Plymouth County25.3+0.1 pts
12Polk County25.3-0.1 pts
14Marshall County25.20 pts
15Howard County25-0.3 pts
16Washington County24.9+0.1 pts
17Mills County24.6-0.2 pts
18Wayne County24.4+0.1 pts
19Mitchell County24.2-0.2 pts
20Tama County24.2-0.2 pts
21Scott County24.2-0 pts
22Benton County24.1-0.1 pts
23Carroll County24.1+0.2 pts
24Clarke County24.1-0.5 pts
25Marion County24.1-0.2 pts
26Delaware County24.1-0.1 pts
27Linn County24-0.1 pts
28Monroe County24+0.2 pts
29Mahaska County23.9-0.2 pts
30Louisa County23.9-0.5 pts
31Grundy County23.8+0.2 pts
32Chickasaw County23.8+0.1 pts
33Pottawattamie County23.70 pts
34Lucas County23.6+0.1 pts
35Van Buren County23.6+0.3 pts
36Boone County23.5-0.3 pts
37Butler County23.5+0.1 pts
38Keokuk County23.5+0.2 pts
39Iowa County23.4-0.2 pts
40Wright County23.4+0.1 pts
41Cedar County23.4-0.1 pts
42Ida County23.3-0.4 pts
43Hamilton County23.3-0.1 pts
44Franklin County23.3+0.1 pts
45O'Brien County23.3+0.3 pts
46Floyd County23.2+0.3 pts
47Taylor County23.2+0.1 pts
48Union County23.2-0.3 pts
49Ringgold County23.1-1 pts
50Dubuque County23.1-0 pts
51Humboldt County23-0.3 pts
52Greene County23+0.2 pts
53Osceola County23+0.4 pts
54Clay County22.9+0.2 pts
55Hancock County22.9-0.1 pts
56Des Moines County22.90 pts
57Clinton County22.9-0.3 pts
58Guthrie County22.9+0.3 pts
59Harrison County22.9-0.1 pts
60Wapello County22.9+0.1 pts
61Montgomery County22.7-0.1 pts
62Jasper County22.6+0.2 pts
63Worth County22.6+0.3 pts
64Hardin County22.5-0.5 pts
65Shelby County22.5-0.1 pts
66Emmet County22.5+0.1 pts
67Allamakee County22.5-0 pts
68Pocahontas County22.5+0.3 pts
69Henry County22.4-0.1 pts
70Bremer County22.3+0.2 pts
71Clayton County22.3-0 pts
72Cass County22.3-0.3 pts
73Decatur County22.3+0.9 pts
74Jackson County22.2-0.2 pts
75Appanoose County22.2+0.4 pts
76Sac County22.2-0.1 pts
77Fremont County22.1+0.2 pts
78Adair County21.9+0.3 pts
79Palo Alto County21.8-0 pts
80Jones County21.8-0.1 pts
81Black Hawk County21.7+0.1 pts
82Lee County21.7-0.1 pts
83Webster County21.5-0.2 pts
84Kossuth County21.5-0.4 pts
85Monona County21.4-0.2 pts
86Adams County21.4+0.4 pts
87Page County21.3-0.3 pts
88Winnebago County21.2+0.3 pts
89Fayette County21.2-0.3 pts
90Cherokee County21.1+0.3 pts
91Johnson County20.7+0.2 pts
92Calhoun County20.60 pts
93Cerro Gordo County20.4-0.2 pts
94Audubon County20.4-0.4 pts
95Poweshiek County20.1-0.3 pts
96Winneshiek County19.3-0.2 pts
97Dickinson County19.2-0.1 pts
98Jefferson County17.5-0.2 pts
99Story County17.3-0.2 pts

Other periods

About this ranking

Residents aged 0 to 17 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.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

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 0 to 17 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 0 to 17 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 under 18, 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 0 to 17 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 under 18, 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-under-18/iowa-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 0 to 17 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 under 18, 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-under-18/iowa-counties?period=2014.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 2014 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/iowa-counties?period=2014 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_iowa_by_2014,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 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-under-18/iowa-counties?period=2014. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 0 to 17 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 under 18, 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-under-18/iowa-counties?period=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/iowa-counties?period=2014.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Dallas County, with 29% in 2014, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Story County, with 17.3% 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 0 to 17 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 under 18: other rankings

Counties in Iowa: more rankings