King County, WA population age distributions
A complete breakdown of King County's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.
| Age Group | Population | % of Total Population |
|---|---|---|
| Under 5 years | 120,412 | 5.32% |
| 5 to 9 years | 124,058 | 5.48% |
| 10 to 14 years | 128,232 | 5.67% |
| 15 to 19 years | 123,346 | 5.45% |
| 20 to 24 years | 132,192 | 5.84% |
| 25 to 29 years | 196,893 | 8.7% |
| 30 to 34 years | 215,322 | 9.52% |
| 35 to 39 years | 192,285 | 8.5% |
| 40 to 44 years | 166,013 | 7.34% |
| 45 to 49 years | 148,443 | 6.56% |
| 50 to 54 years | 145,042 | 6.41% |
| 55 to 59 years | 132,462 | 5.85% |
| 60 to 64 years | 126,645 | 5.6% |
| 65 to 69 years | 104,423 | 4.61% |
| 70 to 74 years | 83,321 | 3.68% |
| 75 to 79 years | 51,598 | 2.28% |
| 80 to 84 years | 32,634 | 1.44% |
| 85 years and over | 39,392 | 1.74% |
TABLE OF CONTENTS
King County, WA population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2019-2023
FIGURE 1
King County, WA population by age group.
The largest age group is 30 to 34 years with a population of 215,322 (9.52% of the total population).
The largest age group in King County, WA was for the group of age 30 to 34 years with a population of 215,322 (9.52%), according to the 2019-2023 American Community Survey.
At the same time, the smallest age group in King County, WA was the 80 to 84 years with a population of 32,634 (1.44%).
King County, WA population by age cohort
To better understand the age distribution of King County, WA's population, we divided it into the following 3 cohorts:
- Children : Under the age of 18 years
- Adults (working population): Between the age of 18 and 64 years
- Seniors: 65 years and above
FIGURE 2
King County, WA population by age cohort
The largest age group was 18 to 64 years with a population of 1.5 million (66.48% of the total population).
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- King County 's population under 18 was 19.76%, compared to the 22.16% nationwide.
- King County's working population (between 18 and 64) was 66.48%, compared to 61% nationwide.
- King County's elderly or the senior population (over 65 age) was 13.76% as compared to 16.84% nationwide.
King County, WA population pyramid
Population pyramid for King County, WA is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.
Key stats from our analysis of the King County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for King County, WA, is 23.6.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for King County, WA, is 19.7.
- Total dependency ratio for King County, WA is 43.3.
- Potential support ratio, which is the number of youth (working age population) per elderly, for King County, WA is 5.1.
FIGURE 3
King County, WA population pyramid
King County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.
King County, WA population pyramid
Here's the King County, WA's male and female population across different age groups .
| Age Group | Population(Male) | Population(Female) | Total Population |
|---|---|---|---|
| Under 5 years | 61,683 | 58,729 | 120,412 |
| 5 to 9 years | 64,149 | 59,909 | 124,058 |
| 10 to 14 years | 64,743 | 63,489 | 128,232 |
| 15 to 19 years | 62,343 | 61,003 | 123,346 |
| 20 to 24 years | 67,362 | 64,830 | 132,192 |
| 25 to 29 years | 102,829 | 94,064 | 196,893 |
| 30 to 34 years | 113,597 | 101,725 | 215,322 |
| 35 to 39 years | 101,111 | 91,174 | 192,285 |
| 40 to 44 years | 85,735 | 80,278 | 166,013 |
| 45 to 49 years | 76,190 | 72,253 | 148,443 |
| 50 to 54 years | 74,788 | 70,254 | 145,042 |
| 55 to 59 years | 67,265 | 65,197 | 132,462 |
| 60 to 64 years | 63,803 | 62,842 | 126,645 |
| 65 to 69 years | 50,583 | 53,840 | 104,423 |
| 70 to 74 years | 38,489 | 44,832 | 83,321 |
| 75 to 79 years | 23,353 | 28,245 | 51,598 |
| 80 to 84 years | 13,898 | 18,736 | 32,634 |
| 85 years and over | 14,336 | 25,056 | 39,392 |
Things to know
What is the population of King County, WA under 18?
King County's population under the age of 18 is 447,121, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 19.76% of the total resident population of King County, WA.
What is the aging population in King County, WA?
King County's population aged 65 years and above was 311,368. As per the U.S. Census Bureau's American Community Survey, this population is 13.76% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates