North Dakota Population By Age Group and Age Cohort in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 773.34K North Dakota population, the 20-24yrs age group constituted the highest percentage of the total population (8.07%), followed by the 25-29yrs age group (7.61%), and the 30-34yrs age group (7.20%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (60.86%), followed by Children (0-17yrs) (23.85%), and Seniors (65yrs and Over) (15.28%).

The first and second charts below shows the percentage of the population by age group and age cohort respectively. The table below also shows the number and percentages for each age group and age cohort.

You can see similar information for other states, and the United States.

Related Topics: North Dakota ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates.

North Dakota Percentages of Population By Age Group in 2021

20-24yrs

25-29yrs

30-34yrs

Under 5yrs

5-9yrs

35-39yrs

10-14yrs

15-19yrs

55-59yrs

60-64yrs

North Dakota Percentages of Population By Age Cohort in 2021

Adults (18-64yrs)

Children (0-17yrs)

Seniors (65yrs and Over)

North Dakota Population By Age Group in 2021

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Age Group	Number of People	% of Total
20-24yrs	62395	8.07
25-29yrs	58846	7.61
30-34yrs	55657	7.20
Under 5yrs	53417	6.91
5-9yrs	52305	6.76
35-39yrs	51045	6.60
10-14yrs	50743	6.56
15-19yrs	50587	6.54
55-59yrs	48478	6.27
60-64yrs	46996	6.08
40-44yrs	43763	5.66
50-54yrs	41366	5.35
45-49yrs	39548	5.11
65-69yrs	39206	5.07
70-74yrs	28486	3.68
75-79yrs	19055	2.46
85yrs and Over	16952	2.19
80-84yrs	14499	1.88

North Dakota Population By Age Cohort in 2021

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Age Cohort	Number of People	% of Total
Adults (18-64yrs)	470688	60.86
Children (0-17yrs)	184458	23.85
Seniors (65yrs and Over)	118198	15.28