Counties in North Dakota by population under 18

Sioux County had the highest population under 18 of 53 counties in 2018, at 35.8%. Nelson County had the lowest, at 17.9%. The median was 22.5% and the figure for North Dakota was 23.3%. Source: the U.S. Census Bureau.

Highest35.8Sioux County

Lowest17.9Nelson County

Median22.553 counties

North Dakota23.3History

Map of counties, 2018

Under 20
20 to 22
22 to 23
23 to 25
25 and over

%, 2018. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2018

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

Full ranking

Rank	Counties	2018 (%)	Change on 2017
1	Sioux County	35.8	-1.1 pts
2	Rolette County	34.1	+0.1 pts
3	Benson County	33.9	+0.2 pts
4	McKenzie County	28.8	+0.4 pts
5	Mountrail County	27.6	+0.3 pts
6	Golden Valley County	26.5	+0.4 pts
7	Williams County	26.5	+0.5 pts
8	Stark County	25.3	+0.7 pts
9	Dunn County	25.1	+0.7 pts
10	Dickey County	25	+0.1 pts
11	Burke County	24.9	+0.2 pts
12	Oliver County	24.6	+0.2 pts
13	Ward County	24.1	-0 pts
14	Ransom County	24	-0 pts
15	McHenry County	23.9	-0.1 pts
16	Bowman County	23.6	-0.1 pts
17	Morton County	23.4	-0 pts
18	Mercer County	23.4	+0.5 pts
19	Ramsey County	23.3	+0.1 pts
20	Logan County	23.2	+1.4 pts
21	Burleigh County	23.2	-0 pts
22	Renville County	23	0 pts
23	Traill County	22.8	-0.2 pts
24	Walsh County	22.6	-0.3 pts
25	Cass County	22.5	+0.1 pts
26	Towner County	22.5	+0.5 pts
27	Pierce County	22.5	+0.4 pts
28	Eddy County	22.4	+0.5 pts
29	Cavalier County	22.2	+1 pts
30	Divide County	22.2	+0.6 pts
31	LaMoure County	22.2	-0.3 pts
32	Hettinger County	22.2	+1 pts
33	Foster County	22.2	-0.9 pts
34	Richland County	22	+0.3 pts
35	McLean County	22	+0.2 pts
36	Steele County	21.6	-0.4 pts
37	Kidder County	21.5	-0.7 pts
38	Pembina County	21.5	+0.5 pts
39	Slope County	21.1	+0.3 pts
40	Bottineau County	21.1	-0.3 pts
41	Wells County	21.1	+0.6 pts
42	Grand Forks County	20.9	+0.2 pts
43	Billings County	20.7	+1.1 pts
44	Griggs County	20.3	+0.7 pts
45	Grant County	20.2	0 pts
46	Emmons County	20.1	0 pts
47	Sargent County	20.1	-0.2 pts
48	Barnes County	20	-0.2 pts
49	Stutsman County	19.9	-0 pts
50	Sheridan County	19.8	-0.1 pts
51	McIntosh County	19.3	+0.6 pts
52	Adams County	19.1	+0.1 pts
53	Nelson County	17.9	-0 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, 2018) [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, 2018. 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=2018. 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, 2018. 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=2018.

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, 2018 [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=2018 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_north_dakota_2018,
  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, 2018}},
  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=2018. 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, 2018
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=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/north-dakota-counties?period=2018.
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 35.8% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Nelson County, with 17.9% in 2018.

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.