Washington 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 7.62M Washington population, the 30-34yrs age group constituted the highest percentage of the total population (7.61%), followed by the 25-29yrs age group (7.52%), and the 35-39yrs age group (7.18%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (62.48%), followed by Children (0-17yrs) (22.06%), and Seniors (65yrs and Over) (15.46%).

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: Washington ACS-5Yrs Estimates, 2021 Topic List.

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

Washington Percentages of Population By Age Group in 2021

30-34yrs

25-29yrs

35-39yrs

40-44yrs

60-64yrs

55-59yrs

10-14yrs

20-24yrs

5-9yrs

45-49yrs

Washington Percentages of Population By Age Cohort in 2021

Adults (18-64yrs)

Children (0-17yrs)

Seniors (65yrs and Over)

Washington Population By Age Group in 2021

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Age Group	Number of People	% of Total
30-34yrs	579626	7.61
25-29yrs	572530	7.52
35-39yrs	546638	7.18
40-44yrs	497462	6.53
60-64yrs	484625	6.36
55-59yrs	480723	6.31
10-14yrs	479107	6.29
20-24yrs	478112	6.28
5-9yrs	473106	6.21
45-49yrs	472295	6.20
50-54yrs	466981	6.13
15-19yrs	458844	6.02
Under 5yrs	449543	5.90
65-69yrs	408527	5.36
70-74yrs	323719	4.25
75-79yrs	192068	2.52
85yrs and Over	130847	1.72
80-84yrs	122611	1.61

Washington Population By Age Cohort in 2021

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Age Cohort	Number of People	% of Total
Adults (18-64yrs)	4759132	62.48
Children (0-17yrs)	1680460	22.06
Seniors (65yrs and Over)	1177772	15.46