Data / Rankings / Population under 18 / US counties

US counties by population under 18

Kusilvak Census Area had the highest population under 18 of 3144 counties in 2024, at 41.4%. Aleutians East Borough had the lowest, at 6.8%. The median was 21.6% and the figure for the United States was 21.3%. Source: the U.S. Census Bureau.

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Highest41.4Kusilvak Census Area
Lowest6.8Aleutians East Borough
Median21.63144 counties
United States21.3History

Map of counties, 2024

%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

Kusilvak Census Area: 41.4 %Kusilvak Census Area41.4Dewey County: 38.8 %Dewey County38.8Mellette County: 38 %Mellette County38Todd County: 37.8 %Todd County37.8Buffalo County: 36.3 %Buffalo County36.3Loving County: 36.2 %Loving County36.2Northwest Arctic Borough: 35.7 %Northwest Arctic Borough35.7Gaines County: 35.7 %Gaines County35.7Oglala Lakota County: 35.7 %Oglala Lakota County35.7Jackson County: 35.6 %Jackson County35.6Thurston County: 35.6 %Thurston County35.6Corson County: 35.6 %Corson County35.6Bethel Census Area: 35.4 %Bethel Census Area35.4Sioux County: 33.9 %Sioux County33.9Dallam County: 33.2 %Dallam County33.2Benson County: 33 %Benson County33Juab County: 33 %Juab County33Adams County: 32.9 %Adams County32.9Hamlin County: 32.9 %Hamlin County32.9Rolette County: 32.7 %Rolette County32.7Nome Census Area: 32.4 %Nome Census Area32.4Ziebach County: 32.2 %Ziebach County32.2LaGrange County: 31.9 %LaGrange County31.9Menominee County: 31.8 %Menominee County31.8Yoakum County: 31.7 %Yoakum County31.7Roosevelt County: 31.5 %Roosevelt County31.5Morgan County: 31.4 %Morgan County31.4Jefferson County: 31.3 %Jefferson County31.3Adams County: 31.2 %Adams County31.2Rockland County: 30.9 %Rockland County30.9Big Horn County: 30.8 %Big Horn County30.8Geary County: 30.8 %Geary County30.8Bennett County: 30.8 %Bennett County30.8Andrews County: 30.6 %Andrews County30.6Tooele County: 30.6 %Tooele County30.6Long County: 30.6 %Long County30.6Duchesne County: 30.5 %Duchesne County30.5Moore County: 30.5 %Moore County30.5Utah County: 30.4 %Utah County30.4Scotland County: 30.4 %Scotland County30.4Kusilvak Census Area: 41.4 %Kusilvak Census Area41.4Dewey County: 38.8 %Dewey County38.8Mellette County: 38 %Mellette County38Todd County: 37.8 %Todd County37.8Buffalo County: 36.3 %Buffalo County36.3Loving County: 36.2 %Loving County36.2Northwest Arctic Borough: 35.7 %Northwest Arctic Borough35.7Gaines County: 35.7 %Gaines County35.7Oglala Lakota County: 35.7 %Oglala Lakota County35.7Jackson County: 35.6 %Jackson County35.6Thurston County: 35.6 %Thurston County35.6Corson County: 35.6 %Corson County35.6Bethel Census Area: 35.4 %Bethel Census Area35.4Sioux County: 33.9 %Sioux County33.9Dallam County: 33.2 %Dallam County33.2Benson County: 33 %Benson County33Juab County: 33 %Juab County33Adams County: 32.9 %Adams County32.9Hamlin County: 32.9 %Hamlin County32.9Rolette County: 32.7 %Rolette County32.7Nome Census Area: 32.4 %Nome Census Area32.4Ziebach County: 32.2 %Ziebach County32.2LaGrange County: 31.9 %LaGrange County31.9Menominee County: 31.8 %Menominee County31.8Yoakum County: 31.7 %Yoakum County31.7Roosevelt County: 31.5 %Roosevelt County31.5Morgan County: 31.4 %Morgan County31.4Jefferson County: 31.3 %Jefferson County31.3Adams County: 31.2 %Adams County31.2Rockland County: 30.9 %Rockland County30.9Big Horn County: 30.8 %Big Horn County30.8Geary County: 30.8 %Geary County30.8Bennett County: 30.8 %Bennett County30.8Andrews County: 30.6 %Andrews County30.6Tooele County: 30.6 %Tooele County30.6Long County: 30.6 %Long County30.6Duchesne County: 30.5 %Duchesne County30.5Moore County: 30.5 %Moore County30.5Utah County: 30.4 %Utah County30.4Scotland County: 30.4 %Scotland County30.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Kusilvak Census Area41.4-0.3 pts
2Dewey County38.8+0.2 pts
3Mellette County38+4.3 pts
4Todd County37.8-1.5 pts
5Buffalo County36.3-1.1 pts
6Loving County36.2-5.1 pts
7Northwest Arctic Borough35.7-0.4 pts
8Gaines County35.7+0.5 pts
9Oglala Lakota County35.7-0.6 pts
10Jackson County35.6+0.7 pts
11Thurston County35.6+0.1 pts
12Corson County35.6+0.4 pts
13Bethel Census Area35.4-0 pts
14Sioux County33.9-0.7 pts
15Dallam County33.2+1.2 pts
16Benson County33-1.1 pts
17Juab County33-0.5 pts
18Adams County32.9-0.3 pts
19Hamlin County32.9-0.6 pts
20Rolette County32.7-0.5 pts
21Nome Census Area32.4-0.1 pts
22Ziebach County32.2-0.8 pts
23LaGrange County31.9-0.4 pts
24Menominee County31.8+0.1 pts
25Yoakum County31.7+0.4 pts
26Roosevelt County31.5-0.4 pts
27Morgan County31.4-1.2 pts
28Jefferson County31.3-0.7 pts
29Adams County31.2-0.3 pts
30Rockland County30.9+0.5 pts
31Big Horn County30.8-0.4 pts
32Geary County30.8+0.3 pts
33Bennett County30.8-0.5 pts
34Andrews County30.6-0.1 pts
35Tooele County30.6-0.7 pts
36Long County30.6-0.4 pts
37Duchesne County30.5-0.6 pts
38Moore County30.5+0.3 pts
39Utah County30.4-0.6 pts
40Scotland County30.4+0.2 pts
41McKenzie County30.3+0.1 pts
42Holmes County30.3-0 pts
43Bailey County30.2+0.2 pts
44Dillingham Census Area30.2-0.2 pts
45Ford County30.1-0 pts
46Uintah County30.1-0.7 pts
47Colfax County30.1-0.3 pts
48Cassia County30-0.4 pts
49Deaf Smith County30-0.1 pts
50Seward County29.9-0.2 pts
51Maverick County29.9-0.2 pts
52Franklin County29.8-0.5 pts
53Starr County29.8-0.3 pts
54Davis County29.6-0.3 pts
55Daviess County29.6+0.1 pts
56Liberty County29.5+0.3 pts
57Franklin County29.5-0.6 pts
58Zapata County29.5-0.6 pts
59Martin County29.5-0.1 pts
60Mahnomen County29.4-0.1 pts
61Zavala County29.4-0.2 pts
62Jerome County29.3-0.3 pts
63Webb County29.3-0.6 pts
64Clark County29.30 pts
65Box Elder County29.3-0.8 pts
66Crane County29.2+0.6 pts
67Kaufman County29.1-0.1 pts
68Ector County29.1-0.1 pts
69Hamilton County29.1-0.3 pts
70Lynn County29.1+0.5 pts
71Midland County290 pts
72Hidalgo County29-0.5 pts
73Millard County29-0.5 pts
74Davis County28.9-0.8 pts
75Nobles County28.9-0 pts
76Grant County28.8-0.7 pts
77Gray County28.8+0.4 pts
78Glacier County28.8-0.5 pts
79Dakota County28.7+0.2 pts
80Finney County28.6-0.4 pts
81Tulare County28.6-0.4 pts
82Kearny County28.6+0.3 pts
83Bonneville County28.6-0.5 pts
84Beaver County28.5-0.3 pts
85Mountrail County28.5+0.1 pts
86Pottawatomie County28.4-0.4 pts
87Hanson County28.4-0.2 pts
88Terry County28.40 pts
89Charles Mix County28.4-0.7 pts
90Clark County28.3+0.2 pts
91Roberts County28.3-0.1 pts
92Williams County28.30 pts
93Lea County28.3-0.3 pts
94Caribou County28.3-0.2 pts
95Beadle County28.2+0.3 pts
96Castro County28.2-0.4 pts
97Bingham County28.2-0.6 pts
98Sherman County28.1-0.3 pts
99Rich County28.1-0.3 pts
100Lake and Peninsula Borough28.1-0.2 pts
101Haskell County28.1-0.5 pts
102Cochran County28-0.5 pts
103Parmer County28-0.2 pts
104Ward County27.9+0.4 pts
105Dawson County27.9-0.2 pts
106Christian County27.90 pts
107Schuyler County27.9-0 pts
108Texas County27.9+0.1 pts
109Sevier County27.8-0.6 pts
110Reagan County27.8+0.2 pts
111Power County27.8-1 pts
112Oneida County27.7+0.2 pts
113Rosebud County27.7-0.4 pts
114Scott County27.7-0.2 pts
115Ochiltree County27.7-0.8 pts
116Watonwan County27.7+0.8 pts
117Lyon County27.6-0.5 pts
118Webster County27.6-0.2 pts
119Kern County27.6-0.4 pts
120Dimmit County27.6-0.6 pts
121Wichita County27.6+0.4 pts
122Winkler County27.5-0.2 pts
123San Juan County27.5-0.2 pts
124Sterling County27.5+0.9 pts
125Bryan County27.4-0.1 pts
126Sevier County27.4-0.2 pts
127Cache County27.4-0.6 pts
128Hansford County27.4-0 pts
129Adair County27.4+0.1 pts
130Yuma County27.3-0.1 pts
131Emery County27.3-0.5 pts
132Minidoka County27.3-0.5 pts
133Merced County27.3-0.5 pts
134Chambers County27.2-0.4 pts
135Lyman County27.2-0.6 pts
136Moody County27.2+0.4 pts
137Yakima County27.2-0.4 pts
138Grant County27.1-0.5 pts
139Greenlee County27.1-0 pts
140Turner County27.1+0.1 pts
141Cameron County27.1-0.5 pts
142Todd County27.1+0.3 pts
143Liberty County27-0.4 pts
144Stevens County27-0.8 pts
145Sioux County27-0.4 pts
146Hill County26.9-0.4 pts
147Blaine County26.9-0.2 pts
148McCook County26.9+0.3 pts
149Hoke County26.9-0.4 pts
150Val Verde County26.9-0.4 pts
151Wright County26.8-0.4 pts
152Neshoba County26.8-0.3 pts
152Wasatch County26.8-0.9 pts
154Elko County26.8-0.5 pts
155Wallace County26.8+0.2 pts
156Fresno County26.7-0.3 pts
157Hockley County26.6+0.1 pts
158Yuba County26.6-0.2 pts
159Hayes County26.6+1.3 pts
160Madera County26.6-0.4 pts
161Curry County26.6-0.1 pts
162Bell County26.5-0.1 pts
163Imperial County26.5-0.4 pts
164Campbell County26.5-0.4 pts
165Lincoln County26.5-0.2 pts
166Marshall County26.5+0.1 pts
167Titus County26.5-0.6 pts
168Colusa County26.5-0.7 pts
169Graham County26.5-0.8 pts
170Atascosa County26.4-0.2 pts
171Franklin city26.4+0.5 pts
172Reeves County26.4-0.3 pts
173Uvalde County26.4+0.3 pts
174Gove County26.4+0.3 pts
175Conejos County26.4-0.1 pts
175Wayne County26.4+0.1 pts
177Hall County26.4-0.4 pts
178Kendall County26.4-0.5 pts
179Jim Wells County26.4-0.2 pts
180Robeson County26.4+0.2 pts
181Stanton County26.3-0.1 pts
182Lamb County26.3-0.3 pts
183Wyandotte County26.3-0.2 pts
184Elkhart County26.3-0.3 pts
185Morgan County26.3-0.2 pts
186Kingfisher County26.3-0.1 pts
187Canyon County26.3-0.4 pts
188Rockwall County26.3-0.4 pts
189McCurtain County26.2-0.4 pts
190Jim Hogg County26.2-0.8 pts
190Montgomery County26.2-0.4 pts
192Gentry County26.2-0.1 pts
193Fort Bend County26.2-0.5 pts
194Stafford County26.1-0.2 pts
195Ellis County26.1-0.3 pts
196Meade County26.1+0.2 pts
197Manassas city26.1+0.2 pts
198Tunica County26.1-0.5 pts
199St. Bernard Parish26.1-0.5 pts
200Camp County26.1-0.1 pts
201Saline County26.1-0.1 pts
202Pemiscot County26.10 pts
203Effingham County26.1-0.3 pts
204Crawford County26-0.2 pts
205Hutchinson County26+0.3 pts
206Grant County26-0.4 pts
207Wright County26-0.3 pts
208Stark County26+0.1 pts
209Crittenden County26-0.2 pts
210Dunn County26-0.5 pts
211Greeley County25.9+0.1 pts
212Ascension Parish25.9-0.4 pts
213Morrow County25.9-0.6 pts
214Vernon County25.9-0 pts
215Blaine County25.9-0.3 pts
216Dallas County25.9-0.5 pts
216Nemaha County25.90 pts
218Pipestone County25.9-0.1 pts
219Kings County25.9-0.3 pts
220Carroll County25.8-0.1 pts
221Matanuska-Susitna Borough25.8-0.2 pts
222Buena Vista County25.8-0.1 pts
223Jay County25.8+0.3 pts
224Bear Lake County25.8-0.7 pts
224Iron County25.8-0.7 pts
226Tripp County25.8+0.8 pts
227Acadia Parish25.7-0 pts
228Prince William County25.7-0.4 pts
229Platte County25.7-0.3 pts
230Floyd County25.7-0.6 pts
231George County25.7-0.2 pts
232Dunklin County25.7+0.3 pts
233Loudoun County25.7-0.6 pts
234Twin Falls County25.7-0.4 pts
235Marshall County25.6+0.1 pts
236Faulk County25.6+1 pts
236Mercer County25.6-0 pts
238Yukon-Koyukuk Census Area25.6-0.6 pts
239Grundy County25.6-0 pts
240Navarro County25.6-0.2 pts
240St. Landry Parish25.6-0.1 pts
242Logan County25.6+0.5 pts
243Humboldt County25.6-0 pts
244Douglas County25.6+0.3 pts
245Stanislaus County25.6-0.4 pts
246Harnett County25.6-0.2 pts
247Sarpy County25.6-0.4 pts
248Frio County25.6-0.2 pts
249Clark County25.6-1.2 pts
249Weber County25.6-0.5 pts

Showing the top 250 of 3144. The Excel download has every row.

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 (US counties by population under 18, 2024) [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, US counties by population under 18, 2024. 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/us-counties?period=2024. 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. US counties by population under 18, 2024. 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/us-counties?period=2024.

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, US counties by population under 18, 2024 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/us-counties?period=2024 (Accessed: 12 October 2026).

BibTeX
@misc{census_us_counties_by_population_2024,
  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: US counties by population under 18, 2024}},
  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/us-counties?period=2024. 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: US counties by population under 18, 2024
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/us-counties?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/us-counties?period=2024.
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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Questions

Which county has the highest population under 18?

Kusilvak Census Area, with 41.4% in 2024, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Aleutians East Borough, with 6.8% in 2024.

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

US counties: more rankings