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 2017, at 41%. Sumter County had the lowest, at 7.2%. The median was 22.3% and the figure for the United States was 22.6%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest41Todd County
Lowest7.2Sumter County
Median22.33135 counties
United States22.6History

Map of counties, 2017

%, 2017. Hatched areas have no value for this period. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2017

Todd County: 41 %Todd County41Kusilvak Census Area: 40.5 %Kusilvak Census Area40.5Buffalo County: 39 %Buffalo County39Oglala Lakota County: 38.1 %Oglala Lakota County38.1Sioux County: 36.9 %Sioux County36.9Corson County: 36.2 %Corson County36.2Morgan County: 35.8 %Morgan County35.8Bethel Census Area: 35.8 %Bethel Census Area35.8Ziebach County: 35.7 %Ziebach County35.7Northwest Arctic Borough: 35.6 %Northwest Arctic Borough35.6Juab County: 35 %Juab County35Thurston County: 34.9 %Thurston County34.9Jefferson County: 34.7 %Jefferson County34.7Gaines County: 34.6 %Gaines County34.6Loving County: 34.5 %Loving County34.5Adams County: 34.2 %Adams County34.2Big Horn County: 34.2 %Big Horn County34.2Tooele County: 34.1 %Tooele County34.1Nome Census Area: 34 %Nome Census Area34Utah County: 34 %Utah County34Rolette County: 34 %Rolette County34Uintah County: 33.9 %Uintah County33.9Benson County: 33.7 %Benson County33.7LaGrange County: 33.6 %LaGrange County33.6Duchesne County: 33.4 %Duchesne County33.4Davis County: 33.1 %Davis County33.1Franklin County: 33.1 %Franklin County33.1Bennett County: 32.9 %Bennett County32.9Dewey County: 32.7 %Dewey County32.7Menominee County: 32.6 %Menominee County32.6Franklin County: 32.5 %Franklin County32.5Box Elder County: 32.4 %Box Elder County32.4Wasatch County: 32.2 %Wasatch County32.2Webb County: 32 %Webb County32Holmes County: 32 %Holmes County32Zapata County: 32 %Zapata County32Mellette County: 32 %Mellette County32Roosevelt County: 31.8 %Roosevelt County31.8Hidalgo County: 31.8 %Hidalgo County31.8Cassia County: 31.8 %Cassia County31.8Todd County: 41 %Todd County41Kusilvak Census Area: 40.5 %Kusilvak Census Area40.5Buffalo County: 39 %Buffalo County39Oglala Lakota County: 38.1 %Oglala Lakota County38.1Sioux County: 36.9 %Sioux County36.9Corson County: 36.2 %Corson County36.2Morgan County: 35.8 %Morgan County35.8Bethel Census Area: 35.8 %Bethel Census Area35.8Ziebach County: 35.7 %Ziebach County35.7Northwest Arctic Borough: 35.6 %Northwest Arctic Borough35.6Juab County: 35 %Juab County35Thurston County: 34.9 %Thurston County34.9Jefferson County: 34.7 %Jefferson County34.7Gaines County: 34.6 %Gaines County34.6Loving County: 34.5 %Loving County34.5Adams County: 34.2 %Adams County34.2Big Horn County: 34.2 %Big Horn County34.2Tooele County: 34.1 %Tooele County34.1Nome Census Area: 34 %Nome Census Area34Utah County: 34 %Utah County34Rolette County: 34 %Rolette County34Uintah County: 33.9 %Uintah County33.9Benson County: 33.7 %Benson County33.7LaGrange County: 33.6 %LaGrange County33.6Duchesne County: 33.4 %Duchesne County33.4Davis County: 33.1 %Davis County33.1Franklin County: 33.1 %Franklin County33.1Bennett County: 32.9 %Bennett County32.9Dewey County: 32.7 %Dewey County32.7Menominee County: 32.6 %Menominee County32.6Franklin County: 32.5 %Franklin County32.5Box Elder County: 32.4 %Box Elder County32.4Wasatch County: 32.2 %Wasatch County32.2Webb County: 32 %Webb County32Holmes County: 32 %Holmes County32Zapata County: 32 %Zapata County32Mellette County: 32 %Mellette County32Roosevelt County: 31.8 %Roosevelt County31.8Hidalgo County: 31.8 %Hidalgo County31.8Cassia County: 31.8 %Cassia County31.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Todd County41+0.4 pts
2Kusilvak Census Area40.5+0.2 pts
3Buffalo County39-0 pts
4Oglala Lakota County38.1+0.1 pts
5Sioux County36.9-0.8 pts
6Corson County36.2+1.4 pts
7Morgan County35.8+0.2 pts
8Bethel Census Area35.80 pts
9Ziebach County35.7-1.7 pts
10Northwest Arctic Borough35.60 pts
11Juab County35-0.1 pts
12Thurston County34.9-0.5 pts
13Jefferson County34.7-0.3 pts
14Gaines County34.6-0.2 pts
15Loving County34.5-4.2 pts
16Adams County34.2-0 pts
17Big Horn County34.2+0.5 pts
18Tooele County34.1-0.3 pts
19Nome Census Area34-0.5 pts
20Utah County34-0.4 pts
21Rolette County34-0.3 pts
22Uintah County33.9-0.5 pts
23Benson County33.7+0.1 pts
24LaGrange County33.6-0.1 pts
25Duchesne County33.4-0.6 pts
26Davis County33.1-0.2 pts
27Franklin County33.1-0.4 pts
28Bennett County32.9+0.1 pts
29Dewey County32.7-0.3 pts
30Menominee County32.60 pts
31Franklin County32.5-0.4 pts
32Box Elder County32.4-0.3 pts
33Wasatch County32.2-0.1 pts
34Webb County32-0.5 pts
35Holmes County32-0.4 pts
36Zapata County32-0.6 pts
37Mellette County32-0.3 pts
38Roosevelt County31.8+0.1 pts
39Hidalgo County31.8-0.5 pts
40Cassia County31.8-0.5 pts
41Jackson County31.8+0.4 pts
42Bingham County31.5-0.1 pts
43Grant County31.5-0.2 pts
44Millard County31.4+0.3 pts
45Bailey County31.4-0.6 pts
46Hamlin County31.40 pts
47Adams County31.40 pts
48Starr County31.3-0.2 pts
49Seward County31.2+0.1 pts
50Glacier County31.20 pts
51Ford County31.2+0.3 pts
52Dillingham Census Area31.1+0.1 pts
53Hemphill County31.1-0.5 pts
54Deaf Smith County31.1-0.3 pts
55Bonneville County31.1-0.2 pts
56Jerome County31-0.1 pts
57Beaver County31+0.5 pts
58Ochiltree County31-0.3 pts
59Power County30.9+0.1 pts
60Hanson County30.9-0.3 pts
61Tulare County30.8-0.3 pts
62Sevier County30.7-0.1 pts
63Moore County30.7-0.2 pts
64Lincoln County30.7-0.6 pts
65Hamilton County30.5-0.1 pts
66Maverick County30.5-0.5 pts
67Mahnomen County30.5+0.6 pts
68Haskell County30.4+0.6 pts
69Finney County30.2-0.5 pts
70San Juan County30.2-0.7 pts
71Long County30.2-0.1 pts
72Andrews County30.2-0.1 pts
73Cache County30.1-0.4 pts
74Cameron County30.1-0.5 pts
75Dallam County30.1+0.1 pts
76Lyman County30.1+0.3 pts
77Colfax County30.1+0.1 pts
78Oldham County30.1-0.7 pts
79Scotland County30+0.5 pts
80Geary County29.9-0.1 pts
81King County29.8+0.7 pts
82Yoakum County29.8-1 pts
83Emery County29.8-0.6 pts
84Rich County29.7-0.6 pts
85Caribou County29.6+0.2 pts
86Merced County29.6-0.1 pts
86Parmer County29.6+0.2 pts
88Uinta County29.5-0.4 pts
89Blaine County29.5+0.2 pts
90Stevens County29.5-0.6 pts
91Canyon County29.5-0.4 pts
92Lea County29.5-0.4 pts
93Kendall County29.5-0.4 pts
94Reagan County29.5+0.2 pts
95Crane County29.4-0 pts
96Sherman County29.4+0.8 pts
97Grant County29.3-0.2 pts
98Zavala County29.2-0.9 pts
99Iron County29.1-0.2 pts
100Hansford County29.1-0.2 pts
101Daviess County29.1+0.1 pts
102Pottawatomie County29.1-0.2 pts
103Clark County290 pts
103Davis County29+0.2 pts
105Yakima County29-0.2 pts
106Loudoun County29-0.2 pts
107Charles Mix County29-0.3 pts
108Lyon County29+0.1 pts
109Lincoln County29-0.1 pts
110Forsyth County28.9-0.4 pts
111Texas County28.9+0.1 pts
112Winkler County28.9-0.5 pts
113Martin County28.9-0.5 pts
114McKinley County28.9-0.3 pts
115Oneida County28.8+0.1 pts
116Kern County28.8-0.2 pts
117Gray County28.8-0.7 pts
118Minidoka County28.80 pts
119Bryan County28.8-0.1 pts
120Greenlee County28.8-0.2 pts
121Weber County28.8-0.3 pts
122Castro County28.7-0.1 pts
123Fremont County28.7-0.2 pts
124Stanton County28.7-0.9 pts
125Wright County28.7-0.2 pts
126Dakota County28.7-0.2 pts
127Cochran County28.6-0.2 pts
128Dallas County28.6-0.1 pts
129Tunica County28.5-0.7 pts
130Colusa County28.5+0.3 pts
131Hoke County28.5-0.2 pts
132Graham County28.5-0.2 pts
133Gooding County28.4+0.4 pts
134McKenzie County28.4-0 pts
135Lake and Peninsula Borough28.4+1 pts
136Rockland County28.4+0.3 pts
137Sevier County28.40 pts
138Sanpete County28.3-0.4 pts
139Jim Hogg County28.3-0.7 pts
140Williamson County28.3-0.1 pts
141Upton County28.3-0.1 pts
142Dimmit County28.3-0.7 pts
143Kearny County28.3+0.3 pts
144Scott County28.2-0.2 pts
145Fresno County28.2-0.2 pts
146Campbell County28.2-0.6 pts
147Elko County28.20 pts
148Kaufman County28.10 pts
149Twin Falls County28.1+0.1 pts
150Titus County28.1-0.2 pts
151Hamilton County28.1-0.4 pts
152Dawson County28.1-0.1 pts
153Manassas Park city28-0.3 pts
154Sarpy County28-0.1 pts
155Union County28-0.4 pts
156Fort Bend County28-0.1 pts
157Owyhee County28+0.2 pts
158Neshoba County27.9-0.1 pts
159Ector County27.9-0.3 pts
160Sioux County27.9+0.1 pts
161Terry County27.9+0.4 pts
162Rosebud County27.8-0.4 pts
163Carver County27.8-0.1 pts
164Chambers County27.80 pts
165Logan County27.8-0.1 pts
166Elkhart County27.8-0.1 pts
167Bear Lake County27.7+0.4 pts
168Madera County27.7-0.1 pts
169Matanuska-Susitna Borough27.7-0.1 pts
170Washington County27.7-0.4 pts
171Oconee County27.7+0.1 pts
172Lynn County27.6+0.6 pts
173Clark County27.6-0.6 pts
174Wyandotte County27.6-0.1 pts
175Roberts County27.6+0.1 pts
176Delaware County27.6-0.2 pts
177Lamb County27.60 pts
178Ascension Parish27.6-0.2 pts
179Rockwall County27.6-0.2 pts
180St. Bernard Parish27.6-0.2 pts
181Salt Lake County27.5-0.4 pts
181San Juan County27.5-0.2 pts
183Conejos County27.50 pts
183Jim Wells County27.5-0.4 pts
185Prince William County27.4-0.2 pts
186Douglas County27.4-0.6 pts
187Floyd County27.4-0 pts
188Kenedy County27.4-1.6 pts
189Morrow County27.4-0.8 pts
190Val Verde County27.4-0.3 pts
191Midland County27.3-0.1 pts
192Schley County27.3-0.1 pts
193Mountrail County27.3+1.3 pts
194Jeff Davis County27.3-0.1 pts
195Schleicher County27.3-0.7 pts
196Paulding County27.2-0.3 pts
197Imperial County27.2-0.4 pts
198Sweetwater County27.2-0.3 pts
199Benton County27.2-0.2 pts
200Fallon County27.2+0.3 pts
201Bell County27.2-0.2 pts
202Harnett County27.2-0.3 pts
203Santa Cruz County27.2-0.3 pts
204Webster County27.2+0.1 pts
205Kingfisher County27.20 pts
206Montgomery County27.2-0.1 pts
207Teton County27.2-0.7 pts
208Payette County27.1-0.4 pts
209San Joaquin County27.1-0.2 pts
210Yuba County27.1+0.1 pts
211Ellis County27.1-0 pts
212Clayton County27-0.3 pts
213Hall County27-0.1 pts
214Kings County270 pts
215Crosby County27-0.5 pts
216Atascosa County27-0.3 pts
217Nobles County27+0.1 pts
218Atkinson County27-0.2 pts
219Curry County27-0 pts
220Navajo County27-0.3 pts
221Boone County27-0.1 pts
222Adams County27-0.4 pts
223Weld County26.9-0.1 pts
224Beadle County26.9+0.2 pts
225Effingham County26.9-0.1 pts
226Canadian County26.9-0.1 pts
226Gwinnett County26.9-0.3 pts
228Dodge County26.9-0.3 pts
229Lincoln County26.9-0.4 pts
230Ward County26.9-0.2 pts
231Apache County26.9-0.5 pts
232Boone County26.9-0.3 pts
233Collin County26.9-0.3 pts
234Scott County26.8+0.3 pts
235Sherburne County26.8-0.3 pts
236Sterling County26.8-0.1 pts
237Chaves County26.8-0.2 pts
238Buchanan County26.8+0.1 pts
239Stafford County26.8+0.1 pts
240Liberty County26.8-0.5 pts
241Hale County26.8-0.3 pts
242Crittenden County26.8-0.5 pts
243Benton County26.8-0 pts
244El Paso County26.7-0.4 pts
245Stanislaus County26.7-0.1 pts
246Scott County26.7+0.2 pts
247Bannock County26.7-0.1 pts
248Meade County26.7+0.1 pts
249Todd County26.7-0.5 pts
250Hill County26.7+0.1 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 2017 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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_us_counties_by_population_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/us-counties?period=2017.
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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank US counties by population under 18 using official data, and cite the source.
rank_places {"indicator":"population_0_17_share","level":"province","within":"United States","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_0_17_share&level=province&within=United%20States&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population under 18?

Todd County, with 41% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Sumter County, with 7.2% in 2017.

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 2017 and are not ranked.

Population under 18: other rankings

US counties: more rankings