Data / Rankings / Population under 18 / US counties

US counties by population under 18

Loving County had the highest population under 18 of 3144 counties in 2021, at 50.9%. Sumter County had the lowest, at 7.2%. The median was 21.9% and the figure for the United States was 22%. Source: the U.S. Census Bureau.

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Highest50.9Loving County
Lowest7.2Sumter County
Median21.93144 counties
United States22History

Map of counties, 2021

%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Loving County: 50.9 %Loving County50.9Kusilvak Census Area: 41.7 %Kusilvak Census Area41.7Todd County: 40.6 %Todd County40.6Buffalo County: 37.8 %Buffalo County37.8Oglala Lakota County: 37.3 %Oglala Lakota County37.3Sioux County: 36.1 %Sioux County36.1Jackson County: 36 %Jackson County36Bethel Census Area: 35.8 %Bethel Census Area35.8Northwest Arctic Borough: 35.7 %Northwest Arctic Borough35.7Corson County: 35.4 %Corson County35.4Gaines County: 35.1 %Gaines County35.1Thurston County: 35 %Thurston County35Dewey County: 34.9 %Dewey County34.9Benson County: 34.7 %Benson County34.7Morgan County: 34.2 %Morgan County34.2Rolette County: 34.1 %Rolette County34.1Juab County: 34.1 %Juab County34.1Adams County: 33.9 %Adams County33.9Jefferson County: 33.4 %Jefferson County33.4Hamlin County: 33.2 %Hamlin County33.2Mellette County: 33 %Mellette County33LaGrange County: 32.7 %LaGrange County32.7Roosevelt County: 32.7 %Roosevelt County32.7Menominee County: 32.6 %Menominee County32.6Big Horn County: 32.5 %Big Horn County32.5Uintah County: 32.5 %Uintah County32.5Tooele County: 32.4 %Tooele County32.4Nome Census Area: 32.3 %Nome Census Area32.3Ziebach County: 32.3 %Ziebach County32.3Duchesne County: 32.3 %Duchesne County32.3Utah County: 32.1 %Utah County32.1Adams County: 31.5 %Adams County31.5Zapata County: 31.5 %Zapata County31.5Long County: 31.5 %Long County31.5Bennett County: 31.4 %Bennett County31.4Dillingham Census Area: 31.4 %Dillingham Census Area31.4Franklin County: 31.3 %Franklin County31.3Davis County: 31.2 %Davis County31.2Franklin County: 31.2 %Franklin County31.2Box Elder County: 31 %Box Elder County31Loving County: 50.9 %Loving County50.9Kusilvak Census Area: 41.7 %Kusilvak Census Area41.7Todd County: 40.6 %Todd County40.6Buffalo County: 37.8 %Buffalo County37.8Oglala Lakota County: 37.3 %Oglala Lakota County37.3Sioux County: 36.1 %Sioux County36.1Jackson County: 36 %Jackson County36Bethel Census Area: 35.8 %Bethel Census Area35.8Northwest Arctic Borough: 35.7 %Northwest Arctic Borough35.7Corson County: 35.4 %Corson County35.4Gaines County: 35.1 %Gaines County35.1Thurston County: 35 %Thurston County35Dewey County: 34.9 %Dewey County34.9Benson County: 34.7 %Benson County34.7Morgan County: 34.2 %Morgan County34.2Rolette County: 34.1 %Rolette County34.1Juab County: 34.1 %Juab County34.1Adams County: 33.9 %Adams County33.9Jefferson County: 33.4 %Jefferson County33.4Hamlin County: 33.2 %Hamlin County33.2Mellette County: 33 %Mellette County33LaGrange County: 32.7 %LaGrange County32.7Roosevelt County: 32.7 %Roosevelt County32.7Menominee County: 32.6 %Menominee County32.6Big Horn County: 32.5 %Big Horn County32.5Uintah County: 32.5 %Uintah County32.5Tooele County: 32.4 %Tooele County32.4Nome Census Area: 32.3 %Nome Census Area32.3Ziebach County: 32.3 %Ziebach County32.3Duchesne County: 32.3 %Duchesne County32.3Utah County: 32.1 %Utah County32.1Adams County: 31.5 %Adams County31.5Zapata County: 31.5 %Zapata County31.5Long County: 31.5 %Long County31.5Bennett County: 31.4 %Bennett County31.4Dillingham Census Area: 31.4 %Dillingham Census Area31.4Franklin County: 31.3 %Franklin County31.3Davis County: 31.2 %Davis County31.2Franklin County: 31.2 %Franklin County31.2Box Elder County: 31 %Box Elder County31
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Loving County50.9+6.4 pts
2Kusilvak Census Area41.7-0 pts
3Todd County40.6-0.2 pts
4Buffalo County37.8-0.2 pts
5Oglala Lakota County37.3-0.2 pts
6Sioux County36.1+0.4 pts
7Jackson County36+1.3 pts
8Bethel Census Area35.8+0.2 pts
9Northwest Arctic Borough35.7+0.2 pts
10Corson County35.4+0.5 pts
11Gaines County35.1-0.2 pts
12Thurston County35+0.2 pts
13Dewey County34.9+0.5 pts
14Benson County34.7-0.6 pts
15Morgan County34.2-0.5 pts
16Rolette County34.10 pts
17Juab County34.1-0.3 pts
18Adams County33.9-0 pts
19Jefferson County33.4-0.3 pts
20Hamlin County33.2+0.7 pts
21Mellette County33+0.8 pts
22LaGrange County32.7-0.3 pts
23Roosevelt County32.7+0.6 pts
24Menominee County32.6+0.1 pts
25Big Horn County32.5-0.8 pts
26Uintah County32.5-0.5 pts
27Tooele County32.4-0.5 pts
28Nome Census Area32.3-0.5 pts
29Ziebach County32.3+0.2 pts
30Duchesne County32.3-0.5 pts
31Utah County32.1-0.5 pts
32Adams County31.50 pts
33Zapata County31.5-0 pts
34Long County31.5+0.2 pts
35Bennett County31.4-1 pts
35Dillingham Census Area31.40 pts
37Franklin County31.3-0.4 pts
38Davis County31.2-0.7 pts
39Franklin County31.2-0.5 pts
40Box Elder County31-0.4 pts
41Millard County31-0.2 pts
42Yoakum County31-0.1 pts
43Andrews County30.8-0.2 pts
44Cassia County30.8-0.2 pts
45Webb County30.8-0.6 pts
46Starr County30.7-0.3 pts
47Ford County30.6-0.1 pts
48Martin County30.5+0.3 pts
49Glacier County30.5-0.5 pts
50Holmes County30.5-0.2 pts
51Lake and Peninsula Borough30.5+0.1 pts
52Deaf Smith County30.5-0.2 pts
53Dallam County30.4+0.4 pts
54Hidalgo County30.4-0.5 pts
55Davis County30.4+0.1 pts
56Seward County30.4-0.3 pts
57Maverick County30.3-0.1 pts
58Colfax County30.3-0.2 pts
59Bonneville County30.1-0.3 pts
60Moore County30.1-0.3 pts
61Bingham County30-0.3 pts
62Geary County29.9+0.3 pts
63Scotland County29.8-0.1 pts
64Power County29.8-0.2 pts
65Jerome County29.8-0.4 pts
66Beaver County29.8-0.6 pts
67Zavala County29.8+0.2 pts
68Grant County29.8-0 pts
69Tulare County29.8-0.4 pts
70McKenzie County29.7-0.3 pts
71Ochiltree County29.6-0.4 pts
72Rich County29.6+0.1 pts
73Rockland County29.5+0.1 pts
74Bailey County29.5+0.1 pts
75Finney County29.5-0 pts
76Sevier County29.4-0.5 pts
77Clark County29.4+0.1 pts
78Pottawatomie County29.20 pts
79Wasatch County29.2-0.9 pts
80Sherman County29.2+0.2 pts
81Daviess County29.1+0.1 pts
82Blaine County29.1-0.1 pts
83Charles Mix County29.1-0.3 pts
84Lea County29.1-0.3 pts
85Mahnomen County29.1+0.1 pts
86Caribou County29.1-0.2 pts
87Lyman County29-0.2 pts
88Emery County28.9-0.2 pts
89Cache County28.9-0.3 pts
90Hanson County28.9+0.1 pts
91Ector County28.9-0.1 pts
92Kaufman County28.8+0.1 pts
93Mountrail County28.7+0.2 pts
94Haskell County28.6-0.9 pts
95Castro County28.6+0.4 pts
96Texas County28.6-0.5 pts
97Parmer County28.60 pts
98Midland County28.6+0.1 pts
99Cameron County28.6-0.6 pts
100Dakota County28.5-0.5 pts
101Merced County28.5-0.3 pts
102Stevens County28.5+0.3 pts
103Lyon County28.5-0.2 pts
104Lynn County28.5-0.1 pts
105Minidoka County28.4-0.4 pts
106Reagan County28.4-0.7 pts
107San Juan County28.4-0.4 pts
108Roberts County28.4-0.2 pts
109Kern County28.4-0.3 pts
110Crane County28.40 pts
111Bryan County28.3-0.4 pts
112Grant County28.3-0.3 pts
113Yakima County28.3-0.3 pts
114Cochran County28.3-0.4 pts
115Nobles County28.2+0.1 pts
116Hoke County28.2-0 pts
117Gray County28.2+0.1 pts
118Kearny County28.2-0.5 pts
119Rosebud County28.1+0.3 pts
120Jim Hogg County28.1+0.2 pts
121Liberty County28.1+0.9 pts
122Hansford County28-0.9 pts
123Dimmit County28+0.2 pts
124Greenlee County27.9+0.1 pts
125Sevier County27.9-0.3 pts
126Clark County27.9+0.6 pts
127Scott County27.9-0 pts
127Titus County27.9-0.3 pts
129Beadle County27.90 pts
130Elko County27.9-0.3 pts
131Iron County27.8-0.5 pts
132Hamilton County27.8-0.8 pts
133Williams County27.8+0.1 pts
134Ward County27.8-0.4 pts
135Dawson County27.8-0.3 pts
136Chambers County27.8-0.4 pts
137Kendall County27.8-0.6 pts
138Winkler County27.8-0.5 pts
139Wright County27.7-0.4 pts
140Sioux County27.70 pts
141Schuyler County27.7+1 pts
142Uinta County27.6-0.4 pts
143Fresno County27.6-0.2 pts
144Bear Lake County27.6+0.3 pts
145Clark County27.60 pts
146Val Verde County27.60 pts
147Campbell County27.6-0.2 pts
148Graham County27.6-0.4 pts
149Webster County27.50 pts
150Madera County27.5-0.3 pts
151Terry County27.5-0.1 pts
152Neshoba County27.50 pts
153Colusa County27.5-0.5 pts
154Canyon County27.5-0.5 pts
155Loudoun County27.4-0.7 pts
156Adair County27.4-0 pts
157St. Bernard Parish27.4-0.1 pts
158Hemphill County27.3-1.5 pts
159Imperial County27.3-0.3 pts
160Sanpete County27.3-0.6 pts
161Oldham County27.3-1.9 pts
162McKinley County27.3-0.4 pts
163Hill County27.3-0.2 pts
164Fort Bend County27.3-0.4 pts
165Lincoln County27.3-0.5 pts
166Lincoln County27.2-0.5 pts
167Weber County27.2-0.5 pts
168Gooding County27.2-0.6 pts
169Elkhart County27.2-0.2 pts
170Todd County27.1+0.1 pts
171Oconee County27-0.3 pts
172Curry County27-0.1 pts
173Yuma County27+0.1 pts
174Tunica County27-0.4 pts
175Hall County27-0.2 pts
176Forsyth County27-0.7 pts
177Ascension Parish27-0.3 pts
178Stanton County27-0.7 pts
179Morrow County27-0.2 pts
180Dallas County27-0.3 pts
181Lamb County270 pts
182Atascosa County27-0.1 pts
183Montgomery County27+0.1 pts
184Conejos County27+0.3 pts
185Sarpy County27-0.4 pts
186Hockley County27+0.4 pts
187Yuba County26.9-0.2 pts
188Rockwall County26.9-0.2 pts
189Bell County26.9-0.1 pts
190Wyandotte County26.9-0.3 pts
191Twin Falls County26.9-0.4 pts
192Effingham County26.8-0.2 pts
193Jim Wells County26.8-0.1 pts
194Floyd County26.8+0.1 pts
195Kings County26.8-0.1 pts
196Williamson County26.8-0.5 pts
197Kingfisher County26.7-0.2 pts
198Matanuska-Susitna Borough26.7-0.3 pts
199Oneida County26.7-0.7 pts
200Grant County26.7-0.1 pts
201Liberty County26.7-0.3 pts
202Sterling County26.7+1.4 pts
203Crittenden County26.7-0.1 pts
204Moody County26.7-0.1 pts
205Wayne County26.7+0.1 pts
206Wallace County26.6+1 pts
207Schley County26.6+0.1 pts
208Owyhee County26.6-0.2 pts
209Gove County26.6+1 pts
210Ellis County26.6-0.1 pts
211Canadian County26.6-0.2 pts
212Stafford County26.5-0.1 pts
213Prince William County26.5-0.3 pts
214Christian County26.5-0 pts
215Union County26.5-0.4 pts
216Crawford County26.4-0.3 pts
217Meade County26.4-0 pts
218Dunn County26.4+0.4 pts
219Buena Vista County26.4-0.1 pts
220Scott County26.4-0.5 pts
221Crosby County26.3+0.4 pts
222Humboldt County26.3-0.2 pts
223Harnett County26.3-0.2 pts
224Coahoma County26.3+0.1 pts
225Gentry County26.3+0.5 pts
226Stanislaus County26.3-0.2 pts
227Fremont County26.3-0.7 pts
228McDonald County26.3-0.1 pts
229San Joaquin County26.3-0.3 pts
230Benton County26.2-0.3 pts
231Morgan County26.2-0.3 pts
232Hamilton County26.2-0.6 pts
233Carver County26.2-0.6 pts
234Phillips County26.2-0.4 pts
235Weld County26.2-0.3 pts
236Nemaha County26.2+0.2 pts
237Buchanan County26.2-0.1 pts
238Sherburne County26.2-0.3 pts
239Hendry County26.2-0.4 pts
240Oldham County26.2-0.3 pts
241Leflore County26.1-0.3 pts
242Apache County26.1-0.3 pts
243Vernon County26.1+0.2 pts
244Paulding County26.1-0.4 pts
245Scott County26.1+0.4 pts
246Camp County26.1+0.1 pts
247Livingston Parish26.10 pts
248Chaves County26.1-0.3 pts
248Upton County26.1-0.5 pts
250Blaine County26.1+0.1 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, 2021) [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, 2021. 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=2021. 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, 2021. 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=2021.

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, 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_us_counties_by_population_2021,
  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, 2021}},
  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=2021. 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, 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/us-counties?period=2021.
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?

Loving County, with 50.9% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Sumter County, with 7.2% in 2021.

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