Counties in North Dakota by population under 18

Sioux County had the highest population under 18 of 53 counties in 2015, at 37.3%. Nelson County had the lowest, at 17.9%. The median was 22.2% and the figure for North Dakota was 23%. Source: the U.S. Census Bureau.

Highest37.3Sioux County

Lowest17.9Nelson County

Median22.253 counties

North Dakota23History

Map of counties, 2015

Under 20
20 to 21
21 to 22
22 to 23
23 to 24
24 and over

%, 2015. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2015

%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2015 (%)	Change on 2014
1	Sioux County	37.3	-0.2 pts
2	Rolette County	33.9	-0.1 pts
3	Benson County	33.6	+0.1 pts
4	McKenzie County	28.3	+0.5 pts
5	Golden Valley County	26.6	+0.7 pts
6	Mountrail County	25.4	+0.6 pts
7	Williams County	25.3	+1 pts
8	Burke County	24.4	+1.3 pts
9	Stark County	24.4	+0.6 pts
10	Dickey County	24.1	+0.6 pts
11	Bowman County	24.1	+0.4 pts
12	Ransom County	23.9	0 pts
13	Ward County	23.9	+0.3 pts
14	Dunn County	23.8	+0.9 pts
15	McHenry County	23.6	+0.3 pts
16	Morton County	23.4	-0.1 pts
17	Renville County	23.3	+0.6 pts
18	Ramsey County	23	+0.6 pts
19	Mercer County	23	+0.3 pts
20	Burleigh County	22.9	+0.2 pts
21	Oliver County	22.8	+0.4 pts
22	Traill County	22.6	+0.2 pts
23	Walsh County	22.5	+0.1 pts
24	Cass County	22.3	+0.1 pts
25	Towner County	22.2	+0.1 pts
26	Slope County	22.2	+0.4 pts
27	Pierce County	22.2	-0 pts
28	Hettinger County	22.1	+0.3 pts
29	McLean County	22.1	-0 pts
30	Foster County	22	-0 pts
31	LaMoure County	21.9	+0.8 pts
32	Richland County	21.5	-0 pts
33	Eddy County	21.5	+0.3 pts
34	Logan County	21.5	+0.4 pts
35	Divide County	21.5	+0.2 pts
36	Bottineau County	21.1	+0.1 pts
37	Pembina County	21.1	-0.1 pts
38	Emmons County	20.8	+0.5 pts
39	Steele County	20.8	-0.3 pts
40	Kidder County	20.7	-0.3 pts
41	Cavalier County	20.7	+0.8 pts
42	Barnes County	20.5	-0 pts
43	Stutsman County	20.4	0 pts
44	Grand Forks County	20.3	+0.1 pts
45	Sargent County	19.7	-1 pts
46	Wells County	19.3	-0 pts
47	Billings County	19.1	-0.4 pts
48	Adams County	19	-0.1 pts
49	Grant County	19	+1 pts
50	Griggs County	18.7	0 pts
51	McIntosh County	18.6	-0 pts
52	Sheridan County	17.9	+1.1 pts
53	Nelson County	17.9	-0.9 pts

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 (Counties in North Dakota by population under 18, 2015) [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, Counties in North Dakota by population under 18, 2015. 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/north-dakota-counties?period=2015. 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. Counties in North Dakota by population under 18, 2015. 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/north-dakota-counties?period=2015.

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, Counties in North Dakota by population under 18, 2015 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/north-dakota-counties?period=2015 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_north_dakota_2015,
  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: Counties in North Dakota by population under 18, 2015}},
  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/north-dakota-counties?period=2015. 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: Counties in North Dakota by population under 18, 2015
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/north-dakota-counties?period=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/north-dakota-counties?period=2015.
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?

Sioux County, with 37.3% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Nelson County, with 17.9% in 2015.

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.