Data / Rankings / Population under 18 / US counties

US counties by population under 18

Todd County had the highest population under 18 of 3135 counties in 2016, at 40.6%. Sumter County had the lowest, at 7.2%. The median was 22.4% and the figure for the United States was 22.8%. Source: the U.S. Census Bureau.

Highest40.6Todd County
Lowest7.2Sumter County
Median22.43135 counties
United States22.8History

Top 40 counties, 2016

Todd County: 40.6 %Todd County40.6Kusilvak Census Area: 40.4 %Kusilvak Census Area40.4Buffalo County: 39 %Buffalo County39Loving County: 38.8 %Loving County38.8Oglala Lakota County: 38 %Oglala Lakota County38Sioux County: 37.6 %Sioux County37.6Ziebach County: 37.4 %Ziebach County37.4Bethel Census Area: 35.8 %Bethel Census Area35.8Morgan County: 35.7 %Morgan County35.7Northwest Arctic Borough: 35.5 %Northwest Arctic Borough35.5Thurston County: 35.4 %Thurston County35.4Juab County: 35.1 %Juab County35.1Jefferson County: 34.9 %Jefferson County34.9Corson County: 34.8 %Corson County34.8Gaines County: 34.7 %Gaines County34.7Nome Census Area: 34.5 %Nome Census Area34.5Utah County: 34.4 %Utah County34.4Uintah County: 34.4 %Uintah County34.4Tooele County: 34.3 %Tooele County34.3Rolette County: 34.3 %Rolette County34.3Adams County: 34.3 %Adams County34.3Duchesne County: 33.9 %Duchesne County33.9LaGrange County: 33.8 %LaGrange County33.8Big Horn County: 33.7 %Big Horn County33.7Benson County: 33.6 %Benson County33.6Franklin County: 33.5 %Franklin County33.5Davis County: 33.4 %Davis County33.4Dewey County: 32.9 %Dewey County32.9Franklin County: 32.9 %Franklin County32.9Bennett County: 32.8 %Bennett County32.8Box Elder County: 32.7 %Box Elder County32.7Zapata County: 32.6 %Zapata County32.6Webb County: 32.6 %Webb County32.6Menominee County: 32.6 %Menominee County32.6Holmes County: 32.4 %Holmes County32.4Hidalgo County: 32.3 %Hidalgo County32.3Wasatch County: 32.3 %Wasatch County32.3Cassia County: 32.3 %Cassia County32.3Mellette County: 32.3 %Mellette County32.3Bailey County: 32 %Bailey County32
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1Todd County40.6-0.1 pts
2Kusilvak Census Area40.4-0.4 pts
3Buffalo County39-0.6 pts
4Loving County38.8+0.1 pts
5Oglala Lakota County38-0.3 pts
6Sioux County37.6+0.3 pts
7Ziebach County37.4-0.3 pts
8Bethel Census Area35.8-0.3 pts
9Morgan County35.7-0.1 pts
10Northwest Arctic Borough35.5+0.1 pts
11Thurston County35.40 pts
12Juab County35.1+0.1 pts
13Jefferson County34.9-0 pts
14Corson County34.80 pts
15Gaines County34.7-0.1 pts
16Nome Census Area34.5+0.2 pts
17Utah County34.4-0.4 pts
18Uintah County34.4-0.2 pts
19Tooele County34.3-0.5 pts
20Rolette County34.3+0.4 pts
21Adams County34.3-0 pts
22Duchesne County33.9-0.3 pts
23LaGrange County33.8-0.1 pts
24Big Horn County33.7+0.4 pts
25Benson County33.60 pts
26Franklin County33.5-0.4 pts
27Davis County33.4-0.2 pts
28Dewey County32.9+0.6 pts
29Franklin County32.9-0.3 pts
30Bennett County32.8-0.2 pts
31Box Elder County32.7-0.2 pts
32Zapata County32.6-0.5 pts
33Webb County32.6-0.4 pts
34Menominee County32.6-0.3 pts
35Holmes County32.4-0.5 pts
36Hidalgo County32.3-0.4 pts
37Wasatch County32.3-0.2 pts
38Cassia County32.3-0.2 pts
39Mellette County32.3+1.4 pts
40Bailey County32-0.3 pts
41Roosevelt County31.7+0.4 pts
42Grant County31.6-0.4 pts
43Bingham County31.6-0.1 pts
44Hemphill County31.6+0.1 pts
45Starr County31.5-0.5 pts
46Hamlin County31.4-0.1 pts
47Adams County31.4+0.1 pts
48Jackson County31.4-0.6 pts
49Deaf Smith County31.3-0.1 pts
50Lincoln County31.3-0.2 pts
51Ochiltree County31.3-0.2 pts
52Bonneville County31.2-0.1 pts
53Hanson County31.2-1 pts
54Seward County31.2-0.2 pts
55Glacier County31.2+0.1 pts
56Millard County31.1-0.5 pts
57Jerome County31.1-0.1 pts
58Tulare County31.1-0.2 pts
59Dillingham Census Area31+0.1 pts
60Maverick County31-0.4 pts
61Ford County30.90 pts
62San Juan County30.9-0.5 pts
63Power County30.9-0.2 pts
64Yoakum County30.8-0.2 pts
65Sevier County30.8-0.1 pts
66Moore County30.8-0.1 pts
67Oldham County30.8-0.2 pts
68Finney County30.8-0.3 pts
69Hamilton County30.6+0.4 pts
70Cameron County30.6-0.4 pts
71Beaver County30.5-0.4 pts
72Cache County30.5-0.2 pts
73Emery County30.4-0.2 pts
74Long County30.3+0.2 pts
75Andrews County30.3-0.1 pts
76Rich County30.3-0.4 pts
77Zavala County30.1-0.4 pts
78Stevens County30.1-0.8 pts
79Dallam County30+0.1 pts
80Geary County30+0.1 pts
81Colfax County30+0.1 pts
82Canyon County29.9-0.3 pts
83Uinta County29.9-0.1 pts
84Lea County29.9-0.1 pts
85Kendall County29.8-0.2 pts
86Mahnomen County29.8+0.1 pts
87Lyman County29.8+0.6 pts
88Haskell County29.7-0.1 pts
89Merced County29.7-0.1 pts
90Stanton County29.5+0.4 pts
91Gray County29.5+0.2 pts
92Grant County29.5-0.3 pts
93Crane County29.5-0.7 pts
94Scotland County29.5+0.6 pts
95Caribou County29.4+0.2 pts
96Martin County29.4-0.3 pts
97Winkler County29.4-0.4 pts
98Parmer County29.4-0.2 pts
99Iron County29.4-0.1 pts
100Hansford County29.4-0 pts
101Blaine County29.3-0.4 pts
102Pottawatomie County29.3+0.3 pts
103Forsyth County29.3-0.3 pts
104Yakima County29.3-0.1 pts
105Charles Mix County29.2-0.2 pts
106Reagan County29.2+0.5 pts
107Loudoun County29.2-0.2 pts
108Tunica County29.2-0.3 pts
109McKinley County29.2-0.4 pts
110King County29.1+2.2 pts
111Lincoln County29.1-0.4 pts
112Kenedy County29.1+0.9 pts
113Jim Hogg County29.1-0.2 pts
114Weber County29-0.1 pts
115Clark County29+0.1 pts
116Daviess County29+0.2 pts
117Kern County29-0.2 pts
118Greenlee County29+0.1 pts
119Dimmit County29-0.4 pts
120Fremont County28.9-0.5 pts
121Bryan County28.9+0.1 pts
122Lyon County28.9+0.3 pts
123Dakota County28.9-0.2 pts
124Castro County28.9-0.4 pts
125Texas County28.90 pts
126Davis County28.8+0.3 pts
127Wright County28.8-0.1 pts
128Campbell County28.8+0.1 pts
129Minidoka County28.8-0.1 pts
130Cochran County28.8-0.7 pts
131Oneida County28.8+0.1 pts
132Sanpete County28.7-0.1 pts
133Graham County28.6+0.1 pts
134Hoke County28.6-0.4 pts
135Dallas County28.6-0.2 pts
136Sherman County28.6-0 pts
137Scott County28.5-0.3 pts
138Hamilton County28.5-0.4 pts
139Arthur County28.4+0.6 pts
140McKenzie County28.4+0.2 pts
141Upton County28.4+0.7 pts
142Fresno County28.4-0.1 pts
143Williamson County28.4-0.1 pts
144Union County28.4-0.3 pts
145Sevier County28.3-0.4 pts
146Manassas Park city28.3-0.1 pts
147Titus County28.3-0.2 pts
148Rosebud County28.2-0.1 pts
149Clark County28.2+0.6 pts
150Ector County28.2-0.4 pts
151Colusa County28.2+0.1 pts
152Morrow County28.2+0.2 pts
153Elko County28.2-0 pts
154Dawson County28.1-0.1 pts
155Washington County28.1-0.5 pts
156Rockland County28.1+0.2 pts
157Sarpy County28.1-0.2 pts
158Fort Bend County28.1-0.1 pts
159Kaufman County28.1-0 pts
160Gooding County28-0.4 pts
161Neshoba County28+0.1 pts
162Douglas County28-0.5 pts
163Twin Falls County28-0 pts
164Carver County28-0 pts
165Schleicher County27.9-0.6 pts
166Kearny County27.9-0.7 pts
167Logan County27.9+2 pts
168Elkhart County27.9-0.1 pts
169Salt Lake County27.9-0.2 pts
170Teton County27.9-0.7 pts
171Jim Wells County27.9-0.2 pts
172Delaware County27.8-0.1 pts
173Chambers County27.8-0 pts
174Owyhee County27.8+0.1 pts
175Ascension Parish27.8-0 pts
176Madera County27.8-0 pts
177Matanuska-Susitna Borough27.8+0.1 pts
178Rockwall County27.8-0.2 pts
179Sioux County27.8+0.1 pts
180St. Bernard Parish27.8-0 pts
181San Juan County27.7-0.1 pts
182Wyandotte County27.7-0.1 pts
183Val Verde County27.6-0.4 pts
184Imperial County27.6-0.1 pts
185Oconee County27.6+0.1 pts
186Prince William County27.6-0.2 pts
187Lamb County27.5-0.4 pts
188Crosby County27.5-0.2 pts
189Payette County27.5+0.1 pts
190Sweetwater County27.5+0.1 pts
191Paulding County27.5-0.4 pts
192Terry County27.5+0.3 pts
193Roberts County27.5-0.4 pts
194Harnett County27.5-0.1 pts
195Conejos County27.5-0.6 pts
196Floyd County27.4+0.2 pts
197Midland County27.4+0.2 pts
198Santa Cruz County27.4-0.4 pts
199Jeff Davis County27.4-0.3 pts
200Schley County27.4-0.7 pts
201Lake and Peninsula Borough27.4-0.5 pts
202Benton County27.4-0.2 pts
203Bell County27.4+0.1 pts
204Clayton County27.4-0.2 pts
205Apache County27.4-0.5 pts
206Adams County27.4-0.3 pts
207Bear Lake County27.3-0.3 pts
208San Joaquin County27.3-0.2 pts
209Crittenden County27.30 pts
210Atascosa County27.3-0.2 pts
211Lincoln County27.3-0.1 pts
212Grant County27.3+0.2 pts
213Liberty County27.3-0.2 pts
214Montgomery County27.3-0.1 pts
215Navajo County27.2-0.4 pts
216Dodge County27.2-0.1 pts
217Atkinson County27.2-0.2 pts
218Gwinnett County27.2-0.3 pts
219El Paso County27.2-0.4 pts
220Collin County27.2-0.2 pts
221Kingfisher County27.2-0.3 pts
222Hall County27.10 pts
223Todd County27.1-0.1 pts
224Ellis County27.1-0.1 pts
225Boone County27.1-0.3 pts
226Sherburne County27.1-0.2 pts
227Hale County27.1-0.1 pts
228Boone County27.1-0.2 pts
229Webster County27.1-0.1 pts
230Lynn County27.1+0.3 pts
231Chaves County27.1-0.2 pts
232Effingham County27.1-0.1 pts
233Weld County27.1-0.2 pts
234Ward County27.1-0 pts
235Humboldt County27.10 pts
236Canadian County27-0.1 pts
237Yuba County27-0.4 pts
238Kings County27-0.2 pts
239Curry County27-0.2 pts
240Wichita County270 pts
241Whitfield County27-0.2 pts
242Williamson County26.9-0.3 pts
243Fallon County26.9-0 pts
244Sterling County26.90 pts
245Nobles County26.9+0.3 pts
246Morgan County26.9-0.1 pts
247Stanislaus County26.9-0.1 pts
248Aurora County26.9+0.5 pts
249Montgomery County26.8-0.1 pts
250Bannock County26.8-0.2 pts

Showing the top 250 of 3135. 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. 9 counties with data in other periods have no value for 2016 and are left out rather than filled from another source. 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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_us_counties_by_population_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/us-counties?period=2016.
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?

Todd County, with 40.6% in 2016, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Sumter County, with 7.2% in 2016.

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. 9 counties have no value for 2016 and are not ranked.

Population under 18: other rankings

US counties: more rankings