Counties in North Dakota by population aged 18 to 64

Cass County had the highest population aged 18 to 64 of 53 counties in 2024, at 64.6%. Sheridan County had the lowest, at 46.3%. The median was 51.8% and the figure for North Dakota was 59.4%. Source: the U.S. Census Bureau.

Highest64.6Cass County

Lowest46.3Sheridan County

Median51.853 counties

North Dakota59.4History

Map of counties, 2024

Under 49
49 to 50
50 to 52
52 to 54
54 to 57
57 and over

%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2024

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

Full ranking

Rank	Counties	2024 (%)	Change on 2023
1	Cass County	64.6	-0.1 pts
2	Grand Forks County	64.3	-0.2 pts
3	Ward County	61	-0.1 pts
4	Williams County	60.9	-0.2 pts
5	McKenzie County	59.6	-0.3 pts
6	Burleigh County	58.9	-0.1 pts
7	Stark County	58.8	-0.4 pts
8	Stutsman County	58.1	-0.2 pts
9	Morton County	57.4	-0.3 pts
10	Richland County	57.2	-0 pts
11	Barnes County	56.6	+0.1 pts
12	Mountrail County	55.9	-0.5 pts
13	Traill County	55.3	-0.3 pts
14	Sioux County	55.2	+0.4 pts
15	Dunn County	55.1	+0.2 pts
16	Billings County	54.8	-0.8 pts
17	Ransom County	54.6	-0 pts
18	Sargent County	54	-1.3 pts
19	Renville County	53.8	-1 pts
20	Ramsey County	53.7	-0.8 pts
21	Walsh County	52.9	-0.2 pts
22	Burke County	52.6	-0.6 pts
23	Mercer County	52.5	-0.9 pts
24	Dickey County	52.3	+0.2 pts
25	Rolette County	52.3	+0.1 pts
26	Bottineau County	52	+0.1 pts
27	Foster County	51.8	-0.5 pts
28	Steele County	51.8	-1 pts
29	McHenry County	51.7	-0.6 pts
30	Divide County	51.3	-0.7 pts
31	Pierce County	51.3	+0.2 pts
32	Hettinger County	51.2	-0.6 pts
33	Pembina County	50.9	-0.8 pts
34	McLean County	50.3	-0.2 pts
35	Eddy County	50.3	-0.9 pts
36	Cavalier County	49.6	-0.3 pts
37	Towner County	49.6	+0.4 pts
38	Kidder County	49.6	-1.1 pts
39	Emmons County	49.6	-0.6 pts
40	Benson County	49.6	+0.5 pts
41	Oliver County	49.4	-1.3 pts
42	Adams County	49.4	+0.4 pts
43	Griggs County	49.1	-0.7 pts
44	Wells County	49.1	-0.2 pts
45	Bowman County	48.9	-0.3 pts
46	Nelson County	48.9	-0.7 pts
47	Logan County	48.8	+0.1 pts
48	Golden Valley County	48.8	-0.2 pts
49	LaMoure County	48.3	-1.1 pts
50	Grant County	47.3	-0.7 pts
51	McIntosh County	46.5	-0.1 pts
52	Slope County	46.4	-0.7 pts
53	Sheridan County	46.3	-0.6 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, 2024) [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, 2024. 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=2024. 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, 2024. 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=2024.

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, 2024 [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=2024 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_north_dakota_2024,
  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, 2024}},
  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=2024. 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, 2024
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=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/north-dakota-counties?period=2024.
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  -

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.

Embed code

<iframe src="https://invokely.ai/embed/rankings/population-18-64/north-dakota-counties?period=2024" width="760" height="500" title="Counties in North Dakota by population aged 18 to 64, 2024, chart from Invokely" loading="lazy" style="border:0;width:100%;max-width:760px" referrerpolicy="strict-origin-when-cross-origin"></iframe>

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 Counties in North Dakota by population aged 18 to 64 using official data, and cite the source.

rank_places {"indicator":"population_18_64_share","level":"province","within":"North Dakota","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_18_64_share&level=province&within=North%20Dakota&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 aged 18 to 64?

Cass County, with 64.6% in 2024, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Sheridan County, with 46.3% in 2024.

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.