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 2023, at 41.7%. Sumter County had the lowest, at 7.2%. The median was 21.7% and the figure for the United States was 21.6%. Source: the U.S. Census Bureau.

Highest41.7Kusilvak Census Area
Lowest7.2Sumter County
Median21.73144 counties
United States21.6History

Top 40 counties, 2023

Kusilvak Census Area: 41.7 %Kusilvak Census Area41.7Loving County: 41.3 %Loving County41.3Todd County: 39.3 %Todd County39.3Dewey County: 38.6 %Dewey County38.6Buffalo County: 37.4 %Buffalo County37.4Oglala Lakota County: 36.2 %Oglala Lakota County36.2Northwest Arctic Borough: 36.1 %Northwest Arctic Borough36.1Thurston County: 35.5 %Thurston County35.5Bethel Census Area: 35.4 %Bethel Census Area35.4Gaines County: 35.2 %Gaines County35.2Corson County: 35.1 %Corson County35.1Jackson County: 34.9 %Jackson County34.9Sioux County: 34.5 %Sioux County34.5Benson County: 34 %Benson County34Mellette County: 33.6 %Mellette County33.6Juab County: 33.5 %Juab County33.5Hamlin County: 33.4 %Hamlin County33.4Rolette County: 33.2 %Rolette County33.2Adams County: 33.2 %Adams County33.2Ziebach County: 33 %Ziebach County33Morgan County: 32.6 %Morgan County32.6Nome Census Area: 32.5 %Nome Census Area32.5LaGrange County: 32.3 %LaGrange County32.3Jefferson County: 32 %Jefferson County32Dallam County: 32 %Dallam County32Roosevelt County: 31.9 %Roosevelt County31.9Menominee County: 31.7 %Menominee County31.7Adams County: 31.5 %Adams County31.5Tooele County: 31.3 %Tooele County31.3Yoakum County: 31.3 %Yoakum County31.3Bennett County: 31.3 %Bennett County31.3Big Horn County: 31.2 %Big Horn County31.2Duchesne County: 31.1 %Duchesne County31.1Utah County: 31 %Utah County31Long County: 31 %Long County31Uintah County: 30.8 %Uintah County30.8Andrews County: 30.7 %Andrews County30.7Geary County: 30.5 %Geary County30.5Cassia County: 30.4 %Cassia County30.4Rockland County: 30.4 %Rockland County30.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Kusilvak Census Area41.7+0.1 pts
2Loving County41.30 pts
3Todd County39.3-1.1 pts
4Dewey County38.6+3.1 pts
5Buffalo County37.4-0.2 pts
6Oglala Lakota County36.2-0.5 pts
7Northwest Arctic Borough36.1+0.2 pts
8Thurston County35.5-0 pts
9Bethel Census Area35.4+0.1 pts
10Gaines County35.2-0 pts
11Corson County35.1-0.2 pts
12Jackson County34.9-1.2 pts
13Sioux County34.5-0.5 pts
14Benson County34-0.2 pts
15Mellette County33.6+1.4 pts
16Juab County33.5-0.4 pts
17Hamlin County33.4+0.4 pts
18Rolette County33.2-0.7 pts
19Adams County33.2-0.4 pts
20Ziebach County33+0.5 pts
21Morgan County32.6-1.1 pts
22Nome Census Area32.5-0.2 pts
23LaGrange County32.3-0.2 pts
24Jefferson County32-0.9 pts
25Dallam County32+0.7 pts
26Roosevelt County31.9-0.5 pts
27Menominee County31.7-0.1 pts
28Adams County31.50 pts
29Tooele County31.3-0.6 pts
30Yoakum County31.3+0.4 pts
31Bennett County31.30 pts
32Big Horn County31.2-0.6 pts
33Duchesne County31.1-0.5 pts
34Utah County31-0.6 pts
35Long County31-0.3 pts
36Uintah County30.8-0.8 pts
37Andrews County30.7-0.1 pts
38Geary County30.5+0.4 pts
39Cassia County30.4-0.3 pts
40Rockland County30.4+0.4 pts
41Colfax County30.4-0.2 pts
42Dillingham Census Area30.4-1.1 pts
43Franklin County30.3-0.6 pts
44Holmes County30.30 pts
45McKenzie County30.2-0.2 pts
46Moore County30.2+0.2 pts
47Ford County30.2-0 pts
48Scotland County30.2+0.2 pts
49Starr County30.1-0.3 pts
50Zapata County30.1-1.1 pts
51Franklin County30.1-0.6 pts
52Seward County30.1-0 pts
53Box Elder County30.1-0.7 pts
54Deaf Smith County30.1-0.2 pts
55Maverick County30.1-0.1 pts
56Bailey County29.9-0 pts
57Davis County29.9-0.3 pts
58Webb County29.9-0.4 pts
59Davis County29.7-0.8 pts
60Jerome County29.6-0.2 pts
61Martin County29.6-0.9 pts
62Daviess County29.60 pts
63Zavala County29.5-0.4 pts
64Grant County29.5-0.1 pts
65Hidalgo County29.5-0.5 pts
66Millard County29.5-0.9 pts
67Mahnomen County29.5-0.2 pts
68Hamilton County29.4+0.8 pts
69Glacier County29.3-0.7 pts
70Kaufman County29.2+0.1 pts
71Clark County29.2-0.1 pts
72Ector County29.2+0.2 pts
73Liberty County29.2+0.3 pts
74Bonneville County29.1-0.5 pts
75Tulare County29.1-0.4 pts
76Finney County29-0.2 pts
77Charles Mix County29-0.2 pts
78Midland County29+0.2 pts
79Nobles County28.9+0.3 pts
80Beaver County28.8-0.4 pts
81Power County28.8-0.8 pts
82Bingham County28.8-0.7 pts
83Pottawatomie County28.8-0.5 pts
84Lynn County28.6+0.1 pts
85Hanson County28.6-0.3 pts
86Haskell County28.6+0.6 pts
87Crane County28.6+0.3 pts
88Lea County28.5-0.2 pts
89Castro County28.5-0.2 pts
90Dakota County28.5-0 pts
91Cochran County28.5-0.6 pts
92Sevier County28.5-0.5 pts
93Sherman County28.5-0.5 pts
94Ochiltree County28.4-0.7 pts
95Caribou County28.4-0.2 pts
96Gray County28.4+0.3 pts
97Mountrail County28.4-0 pts
98Roberts County28.40 pts
99Rich County28.4+0.1 pts
100Terry County28.3+0.2 pts
101Kearny County28.3+0.1 pts
102Lake and Peninsula Borough28.3-1.1 pts
103Williams County28.3+0.4 pts
104Parmer County28.2-0.1 pts
105Dawson County28.2+0.2 pts
106Dimmit County28.1-0.2 pts
107Clark County28.1+0.4 pts
108Lyon County28.1-0.4 pts
109Rosebud County28.1-0.4 pts
110Cache County28-0.5 pts
111Kern County28-0.2 pts
112Christian County27.9+0.9 pts
113Schuyler County27.9+0.4 pts
114Beadle County27.90 pts
115Minidoka County27.9-0.4 pts
116Scott County27.9-0.3 pts
117Emery County27.9-0.8 pts
118Webster County27.8-0.1 pts
119Lyman County27.8-1.3 pts
120Merced County27.8-0.5 pts
121Texas County27.8-0.4 pts
122Stevens County27.7-0.4 pts
123Winkler County27.7+0.5 pts
124San Juan County27.7-0.5 pts
125Wasatch County27.7-0.7 pts
126Sevier County27.7-0.3 pts
127Chambers County27.6-0.2 pts
128Yakima County27.6-0.4 pts
129Grant County27.6-0.4 pts
130Bryan County27.6-0.6 pts
131Cameron County27.6-0.5 pts
132Reagan County27.60 pts
133Oneida County27.5+0.2 pts
134Ward County27.5-0.1 pts
135Yuma County27.5+0.1 pts
136Hansford County27.4-0.3 pts
137Liberty County27.4+0.5 pts
138Sioux County27.3-0.2 pts
139Hoke County27.3-0.6 pts
140Elko County27.3-0.5 pts
141Hill County27.3-0.1 pts
142Val Verde County27.3-0.3 pts
143Graham County27.3-0.8 pts
144Adair County27.20 pts
145Wichita County27.2+0.6 pts
146Wright County27.2-0.3 pts
147Colusa County27.1-0.2 pts
148Greenlee County27.1-0.5 pts
149Titus County27.1-0.4 pts
150Neshoba County27.1-0.2 pts
151Blaine County27.1-1 pts
152Jim Hogg County27.1-0.5 pts
153Fresno County27.1-0.3 pts
154Turner County27+1.1 pts
155Madera County27-0.4 pts
156Imperial County26.9-0.3 pts
157Watonwan County26.9+0.3 pts
158Campbell County26.9-0.3 pts
159Moody County26.9+0.3 pts
160Kendall County26.8-0.5 pts
161Clark County26.8-1.5 pts
162Yuba County26.8-0.2 pts
163Hall County26.8-0.1 pts
164Todd County26.8-0.4 pts
165Reeves County26.7-0 pts
166Lincoln County26.7-0.5 pts
167Bell County26.7-0.3 pts
168Rockwall County26.7-0.1 pts
169Curry County26.7-0.2 pts
170Atascosa County26.7-0.1 pts
171Canyon County26.6-0.4 pts
171McCook County26.6+0.2 pts
173Elkhart County26.6-0.3 pts
174Fort Bend County26.6-0.3 pts
175Montgomery County26.6-0.3 pts
176Lamb County26.6-0.1 pts
177Jim Wells County26.6-0 pts
178McCurtain County26.6+0.2 pts
179St. Bernard Parish26.6-0.3 pts
180Tunica County26.6+0.1 pts
181Hockley County26.6-0.1 pts
182Sterling County26.6-0.3 pts
182Wallace County26.6+0.7 pts
184Iron County26.5-0.6 pts
185Conejos County26.5-0.2 pts
186Morrow County26.5+0.1 pts
187Morgan County26.50 pts
188Wyandotte County26.5-0.2 pts
189Bear Lake County26.5-1.2 pts
190Ellis County26.5-0.1 pts
191Dunn County26.4-0.1 pts
192Grant County26.4-0.3 pts
193Stanton County26.4-0.1 pts
194Marshall County26.4+0.5 pts
195Kingfisher County26.4-0.2 pts
196Dallas County26.4-0.4 pts
197Effingham County26.4-0.3 pts
198Ascension Parish26.3-0.4 pts
199Wayne County26.3-0.1 pts
200Stafford County26.3-0.1 pts
201Gentry County26.3-0.2 pts
202Wright County26.3-0.1 pts
203Floyd County26.3-0.4 pts
204Camp County26.3+0.1 pts
205Loudoun County26.3-0.6 pts
206Saline County26.2+0.1 pts
207Crawford County26.2-0 pts
208Yukon-Koyukuk Census Area26.2+0.4 pts
209Uinta County26.2-0.7 pts
210Sanpete County26.2-0.6 pts
211Hemphill County26.2-0.9 pts
211Kings County26.2-0.4 pts
213Crittenden County26.2-0.1 pts
214Oconee County26.2-0.7 pts
215Uvalde County26.1+0.2 pts
216Blaine County26.1-0.2 pts
217Robeson County26.1+0.3 pts
218Gove County26.1-0.2 pts
219Prince William County26.1-0.3 pts
220Pemiscot County26.1-0.1 pts
221Weber County26.1-0.5 pts
222Matanuska-Susitna Borough26.1-0.4 pts
223Twin Falls County26.1-0.4 pts
224Canadian County26-0.3 pts
225Lincoln County26-0.9 pts
226Harmon County26-0.4 pts
227Sarpy County26-0.5 pts
228Pipestone County26+0.1 pts
229Platte County26+0.2 pts
230Manassas city260 pts
231McKinley County26-0.6 pts
232Stanislaus County25.9-0.2 pts
233Meade County25.9-0.3 pts
234Vernon County25.9-0.2 pts
235Williamson County25.9-0.5 pts
236Carroll County25.9+0.2 pts
237Forsyth County25.9-0.5 pts
238Buena Vista County25.9-0.2 pts
238Lyon County25.9+0.2 pts
240Stark County25.9-0.1 pts
241Franklin city25.9+0.8 pts
242Nemaha County25.90 pts
243Sherburne County25.9-0.2 pts
244Candler County25.8-0.1 pts
245George County25.8-0.1 pts
246Greeley County25.8+0.1 pts
247Harnett County25.8-0.4 pts
248Frio County25.8+0.1 pts
248McDonald County25.8-0.2 pts
250Gooding County25.8-0.7 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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_us_counties_by_population_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/us-counties?period=2023.
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 41.7% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Sumter County, with 7.2% in 2023.

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