Counties in North Dakota by population aged 18 to 64

Grand Forks County had the highest population aged 18 to 64 of 53 counties in 2018, at 66.6%. McIntosh County had the lowest, at 49.4%. The median was 55.4% and the figure for North Dakota was 61.5%. Source: the U.S. Census Bureau.

Highest66.6Grand Forks County

Lowest49.4McIntosh County

Median55.453 counties

North Dakota61.5History

Map of counties, 2018

Under 52
52 to 54
54 to 55
55 to 57
57 to 60
60 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	Grand Forks County	66.6	-0.6 pts
2	Cass County	65.6	-0.5 pts
3	Williams County	64.5	-0.4 pts
4	Ward County	63.2	-0.4 pts
5	McKenzie County	62.4	-0.1 pts
6	Stark County	61.6	-0.5 pts
7	Burleigh County	61	-0.6 pts
8	Stutsman County	60.9	-0.5 pts
9	Richland County	60.4	-1 pts
10	Morton County	59.9	-0.7 pts
11	Mountrail County	59.4	-0.9 pts
12	Dunn County	59	-1.1 pts
13	Billings County	58.3	-2 pts
14	Mercer County	57.7	-0.9 pts
15	Barnes County	57.6	-0.4 pts
16	Slope County	57.6	-0.1 pts
17	Traill County	57.6	-0.1 pts
18	Sargent County	57.4	-0 pts
19	Ramsey County	57.2	-0.4 pts
20	Renville County	56.5	-0.3 pts
21	Foster County	56	+0.3 pts
22	Walsh County	55.6	-0.2 pts
23	Burke County	55.6	-0.6 pts
24	McHenry County	55.6	-0 pts
25	Sioux County	55.5	+0.7 pts
26	Steele County	55.4	0 pts
27	Kidder County	55.4	-0.3 pts
28	Ransom County	55.4	-0.4 pts
29	Bottineau County	55.1	-0.3 pts
30	Pembina County	55.1	-0.8 pts
31	Dickey County	54.9	+0.4 pts
32	Divide County	54.8	-0.6 pts
33	Bowman County	54.5	-1.1 pts
34	Oliver County	54.4	-0.9 pts
35	Towner County	54.2	-0.6 pts
36	McLean County	54.1	-0.8 pts
37	Eddy County	54	-0.6 pts
38	Pierce County	53.9	-0.5 pts
39	Hettinger County	53.4	-0.8 pts
40	Rolette County	53.4	-0.9 pts
41	Adams County	53.2	-1.2 pts
42	LaMoure County	52.7	-0.7 pts
43	Golden Valley County	52.1	-0.9 pts
44	Benson County	52	-0.7 pts
45	Sheridan County	52	-0.1 pts
46	Emmons County	51.8	-0.4 pts
47	Nelson County	51.8	-0.1 pts
48	Wells County	51.4	-0.6 pts
49	Cavalier County	51.2	-0.9 pts
50	Logan County	50.9	-0.8 pts
51	Griggs County	49.9	-1.3 pts
52	Grant County	49.9	-0.5 pts
53	McIntosh County	49.4	-0.2 pts

Other periods

About this ranking

Residents aged 18 to 64 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.

Not comparable with working-age shares for ages 15 to 64 used in EU and World Bank statistics.

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 18 to 64 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 18 to 64 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 aged 18 to 64, 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 18 to 64 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 aged 18 to 64, 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-18-64/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 18 to 64 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 aged 18 to 64, 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-18-64/north-dakota-counties?period=2018.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64, 2018 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/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 18 to 64 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 aged 18 to 64, 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-18-64/north-dakota-counties?period=2018. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 18 to 64 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 aged 18 to 64, 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-18-64/north-dakota-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/north-dakota-counties?period=2018.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64?

Grand Forks County, with 66.6% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

McIntosh County, with 49.4% 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 18 to 64 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.