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 2020, at 44.4%. Sumter County had the lowest, at 7.2%. The median was 22.1% and the figure for the United States was 22.2%. Source: the U.S. Census Bureau.

Highest44.4Loving County
Lowest7.2Sumter County
Median22.13144 counties
United States22.2History

Top 40 counties, 2020

Loving County: 44.4 %Loving County44.4Kusilvak Census Area: 41.7 %Kusilvak Census Area41.7Todd County: 40.8 %Todd County40.8Buffalo County: 38.1 %Buffalo County38.1Oglala Lakota County: 37.5 %Oglala Lakota County37.5Sioux County: 35.7 %Sioux County35.7Bethel Census Area: 35.6 %Bethel Census Area35.6Northwest Arctic Borough: 35.6 %Northwest Arctic Borough35.6Benson County: 35.3 %Benson County35.3Gaines County: 35.3 %Gaines County35.3Corson County: 34.9 %Corson County34.9Thurston County: 34.9 %Thurston County34.9Jackson County: 34.7 %Jackson County34.7Morgan County: 34.7 %Morgan County34.7Dewey County: 34.4 %Dewey County34.4Juab County: 34.3 %Juab County34.3Rolette County: 34.1 %Rolette County34.1Adams County: 33.9 %Adams County33.9Jefferson County: 33.7 %Jefferson County33.7Big Horn County: 33.3 %Big Horn County33.3LaGrange County: 33 %LaGrange County33Uintah County: 32.9 %Uintah County32.9Tooele County: 32.9 %Tooele County32.9Nome Census Area: 32.8 %Nome Census Area32.8Duchesne County: 32.8 %Duchesne County32.8Utah County: 32.6 %Utah County32.6Hamlin County: 32.5 %Hamlin County32.5Menominee County: 32.5 %Menominee County32.5Bennett County: 32.4 %Bennett County32.4Mellette County: 32.2 %Mellette County32.2Roosevelt County: 32.2 %Roosevelt County32.2Ziebach County: 32.1 %Ziebach County32.1Davis County: 31.9 %Davis County31.9Franklin County: 31.7 %Franklin County31.7Franklin County: 31.6 %Franklin County31.6Zapata County: 31.5 %Zapata County31.5Adams County: 31.5 %Adams County31.5Box Elder County: 31.4 %Box Elder County31.4Dillingham Census Area: 31.4 %Dillingham Census Area31.4Webb County: 31.4 %Webb County31.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Loving County44.4+7.5 pts
2Kusilvak Census Area41.7+1 pts
3Todd County40.8+0.6 pts
4Buffalo County38.1-1.1 pts
5Oglala Lakota County37.5+0.3 pts
6Sioux County35.7+0.4 pts
7Bethel Census Area35.6+0.1 pts
8Northwest Arctic Borough35.6-0.1 pts
9Benson County35.3+1.5 pts
10Gaines County35.3+0.8 pts
11Corson County34.9-0.9 pts
12Thurston County34.9+0.5 pts
13Jackson County34.7+2 pts
14Morgan County34.7-0.6 pts
15Dewey County34.4+2 pts
16Juab County34.30 pts
17Rolette County34.1+0.4 pts
18Adams County33.9-0.2 pts
19Jefferson County33.7-0.5 pts
20Big Horn County33.3-0.4 pts
21LaGrange County33-0.3 pts
22Uintah County32.9-0.5 pts
23Tooele County32.9-0.4 pts
24Nome Census Area32.8-0.2 pts
25Duchesne County32.8+0.4 pts
26Utah County32.6-0.5 pts
27Hamlin County32.5+0.4 pts
28Menominee County32.5+0.2 pts
29Bennett County32.4-0.2 pts
30Mellette County32.20 pts
31Roosevelt County32.2+1.3 pts
32Ziebach County32.1-2.8 pts
33Davis County31.9-0.6 pts
34Franklin County31.7-0.4 pts
35Franklin County31.6-0 pts
36Zapata County31.5+0.4 pts
37Adams County31.5+0.1 pts
38Box Elder County31.4-0.3 pts
39Dillingham Census Area31.4+0.1 pts
40Webb County31.4+0.7 pts
41Long County31.3+1.1 pts
42Millard County31.2-0.1 pts
43Yoakum County31.1+2.1 pts
44Starr County31+0.7 pts
45Glacier County31-0.2 pts
46Andrews County31+0.4 pts
47Cassia County30.9-0.5 pts
48Hidalgo County30.9+0.3 pts
49Ford County30.7-0.1 pts
50Holmes County30.7-0.4 pts
51Seward County30.6-0.3 pts
52Deaf Smith County30.6+0.3 pts
53Colfax County30.5+0.2 pts
54Maverick County30.4+0.8 pts
55Lake and Peninsula Borough30.4+1.9 pts
56Beaver County30.4-0.2 pts
56Bonneville County30.4-0 pts
58Moore County30.4+0.1 pts
59Bingham County30.3-0.6 pts
60Martin County30.3+1.4 pts
61Davis County30.3+0.6 pts
62Jerome County30.2-0.5 pts
63Tulare County30.1-0.1 pts
64Wasatch County30.1-0.7 pts
65Dallam County30+0.9 pts
66Power County30-0.3 pts
67McKenzie County30+1 pts
68Ochiltree County30-0.3 pts
69Scotland County29.9-0.1 pts
70Sevier County29.9-0.3 pts
71Grant County29.8-0.3 pts
72Zavala County29.6+1.3 pts
73Geary County29.6+0.4 pts
74Finney County29.5-0.1 pts
75Rich County29.5-1 pts
76Haskell County29.5-0.9 pts
77Lea County29.4+0.4 pts
78Bailey County29.4-1.2 pts
79Charles Mix County29.4+0.6 pts
80Rockland County29.4+0.4 pts
81Caribou County29.3-0.7 pts
82Pottawatomie County29.2-0.1 pts
83Cache County29.2-0.3 pts
84Clark County29.2+0.3 pts
85Blaine County29.2+0.1 pts
86Oldham County29.2+0.3 pts
87Cameron County29.2+0.3 pts
88Lyman County29.2-0.8 pts
89Texas County29.1-0.1 pts
90Reagan County29.1+0.8 pts
91Emery County29.1-0 pts
92Daviess County29-0.1 pts
93Dakota County29+0.1 pts
93Sherman County29+0.6 pts
95Mahnomen County29-0.4 pts
96Ector County28.9+1.2 pts
97Hansford County28.9+0.3 pts
98Hemphill County28.9-0 pts
99Hanson County28.9-1.1 pts
100San Juan County28.8-0.1 pts
101Minidoka County28.8-0 pts
102Merced County28.8-0.2 pts
103Bryan County28.70 pts
104Cochran County28.7+1.1 pts
105Grant County28.70 pts
106Kearny County28.7+0.2 pts
107Kern County28.6+0.2 pts
108Yakima County28.6+0.2 pts
109Kaufman County28.6+0.1 pts
110Lyon County28.6-0.2 pts
111Hamilton County28.6-1.3 pts
112Roberts County28.6+0.4 pts
113Parmer County28.5-0.4 pts
114Lynn County28.5+0.3 pts
115Midland County28.5+1 pts
116Mountrail County28.4+0.3 pts
117Kendall County28.4-0.6 pts
118Iron County28.3-0.4 pts
119Crane County28.3+0.2 pts
120Hoke County28.3+0.1 pts
121Ward County28.3+1.5 pts
122Winkler County28.2+0.2 pts
123Chambers County28.2+0.3 pts
124Nobles County28.2+0.3 pts
124Sevier County28.2-0 pts
126Castro County28.2-0.4 pts
126Stevens County28.2-0.6 pts
128Titus County28.2+0.5 pts
129Elko County28.1-0.2 pts
130Wright County28.1-0.2 pts
131Gray County28.1-0 pts
132Dawson County28.1+0.2 pts
133Loudoun County28.1-0.3 pts
134Graham County28-0.1 pts
135Uinta County28-0.8 pts
136Canyon County27.9-0.5 pts
137Sanpete County27.9-0.3 pts
138Colusa County27.9-0.1 pts
139Jim Hogg County27.9+0.6 pts
140Scott County27.9+0.7 pts
141Beadle County27.9+0.7 pts
142Rosebud County27.8+1 pts
143Greenlee County27.8-0.5 pts
144Fresno County27.80 pts
145Madera County27.8+0.3 pts
146Gooding County27.8+0.3 pts
147Dimmit County27.8+0.3 pts
148Campbell County27.8-0.3 pts
149Lincoln County27.8-0.7 pts
150McKinley County27.7-0.3 pts
151Stanton County27.7-0.7 pts
152Lincoln County27.7-0.5 pts
153Williams County27.7+0.6 pts
154Sioux County27.7-0.2 pts
155Weber County27.7-0.3 pts
156Terry County27.7+0.5 pts
157Forsyth County27.7-0.4 pts
158Fort Bend County27.60 pts
159Imperial County27.6+1 pts
160Clark County27.6+2.3 pts
161Val Verde County27.5+0.8 pts
162Hill County27.5+1.2 pts
163Webster County27.5+0.7 pts
164Arthur County27.4+1.1 pts
165Adair County27.4+1.1 pts
166Neshoba County27.4+0.4 pts
166St. Bernard Parish27.4-0 pts
168Tunica County27.4-0.8 pts
169Elkhart County27.40 pts
170Oconee County27.4-0.2 pts
171Ascension Parish27.4+0.1 pts
172Clark County27.4+0.6 pts
173Sarpy County27.4-0.4 pts
174Oneida County27.3-1.5 pts
175Bear Lake County27.3-0.2 pts
176Dallas County27.3-0.7 pts
177Williamson County27.3-0.5 pts
178Hall County27.3+0.1 pts
179Liberty County27.2+1.2 pts
180Twin Falls County27.2-0.3 pts
181Wyandotte County27.20 pts
182Morrow County27.2-0.3 pts
183Curry County27.2+0.4 pts
184Rockwall County27.20 pts
185Atascosa County27.1+0.4 pts
186Yuba County27.1+0.2 pts
187Bell County27+0.4 pts
188Fremont County27-0.6 pts
188Matanuska-Susitna Borough27-0.1 pts
190Todd County27+0.2 pts
191Effingham County27+0.1 pts
192Lamb County27-0.3 pts
193Jim Wells County27+0.3 pts
194Union County26.9-0.3 pts
195Montgomery County26.9-0.1 pts
196Kingfisher County26.9-0 pts
196Liberty County26.9+0.5 pts
198Yuma County26.9+0.4 pts
199Kings County26.9+0.3 pts
200Scott County26.9-0.5 pts
201Hamilton County26.8-0.6 pts
202Owyhee County26.8-0.4 pts
203Carver County26.8-0.5 pts
204Prince William County26.8-0.1 pts
205Canadian County26.8-0.2 pts
206Moody County26.8+0.2 pts
207Grant County26.8+0.6 pts
208Santa Cruz County26.7+0.5 pts
209Crawford County26.7-0.1 pts
210Ellis County26.7-0.1 pts
211Crittenden County26.7+0.3 pts
212Schuyler County26.7+1 pts
213Floyd County26.7-0.1 pts
214Stafford County26.7+0.1 pts
215Conejos County26.7+0.3 pts
216Hockley County26.6+0.8 pts
217Wayne County26.6+1 pts
218Phillips County26.6+1 pts
219Benton County26.6-0.3 pts
220Hendry County26.6+0.8 pts
221Morgan County26.6+0.1 pts
222Christian County26.6+0.4 pts
223Schley County26.5+0.2 pts
223Upton County26.5-0.5 pts
225San Joaquin County26.5-0 pts
226Harnett County26.5-0.1 pts
227Dodge County26.5+0.2 pts
228Stanislaus County26.5+0.1 pts
229Paulding County26.5-0.1 pts
230Weld County26.5-0.1 pts
231Humboldt County26.5+0.2 pts
232Echols County26.5+0.5 pts
233Leflore County26.5+0.2 pts
234Buena Vista County26.4+0.5 pts
235Sherburne County26.4-0 pts
236Oldham County26.4-0.3 pts
237Gonzales County26.4+1.1 pts
238Jeff Davis County26.4-0.3 pts
239Apache County26.4+0.4 pts
240Meade County26.4+0.3 pts
241Sweetwater County26.4-0.1 pts
242Chaves County26.40 pts
242Delaware County26.4-0.5 pts
244San Juan County26.4-0.3 pts
245McDonald County26.3+0.1 pts
246Columbia County26.3-0 pts
247Fallon County26.3-0.3 pts
248Montgomery County26.30 pts
249Washington County26.3-0.4 pts
250Buchanan County26.3-0.2 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, 2020) [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, 2020. 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=2020. 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, 2020. 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=2020.

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, 2020 [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=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_us_counties_by_population_2020,
  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, 2020}},
  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=2020. 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, 2020
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=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/us-counties?period=2020.
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 44.4% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Sumter County, with 7.2% in 2020.

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