Data / Rankings / Population aged 18 to 64 / Counties in Washington

Counties in Washington by population aged 18 to 64

Whitman County had the highest population aged 18 to 64 of 39 counties in 2021, at 69%. Jefferson County had the lowest, at 47.8%. The median was 56.7% and the figure for Washington was 61.5%. Source: the U.S. Census Bureau.

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Highest69Whitman County
Lowest47.8Jefferson County
Median56.739 counties
Washington61.5History

Map of counties, 2021

Adams County: 54.3 %Asotin County: 54.8 %Benton County: 58 %Chelan County: 56.8 %Clallam County: 51.2 %Clark County: 60.4 %Columbia County: 54.4 %Cowlitz County: 57.3 %Douglas County: 57.1 %Ferry County: 51.3 %Franklin County: 58.6 %Garfield County: 50.5 %Grant County: 56.7 %Grays Harbor County: 56.9 %Island County: 55.3 %Jefferson County: 47.8 %King County: 66 %Kitsap County: 60.5 %Kittitas County: 62.8 %Klickitat County: 56.4 %Lewis County: 56.1 %Lincoln County: 51.7 %Mason County: 56.5 %Okanogan County: 53.6 %Pacific County: 51.3 %Pend Oreille County: 52.5 %Pierce County: 61.9 %San Juan County: 51.3 %Skagit County: 55.8 %Skamania County: 59.3 %Snohomish County: 62.6 %Spokane County: 60.6 %Stevens County: 53.3 %Thurston County: 59.8 %Wahkiakum County: 51.8 %Walla Walla County: 58.5 %Whatcom County: 61.3 %Whitman County: 69 %Yakima County: 56.8 %
  • Under 52
  • 52 to 55
  • 55 to 57
  • 57 to 58
  • 58 to 61
  • 61 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Whitman County: 69 %Whitman County69King County: 66 %King County66Kittitas County: 62.8 %Kittitas County62.8Snohomish County: 62.6 %Snohomish County62.6Pierce County: 61.9 %Pierce County61.9Whatcom County: 61.3 %Whatcom County61.3Spokane County: 60.6 %Spokane County60.6Kitsap County: 60.5 %Kitsap County60.5Clark County: 60.4 %Clark County60.4Thurston County: 59.8 %Thurston County59.8Skamania County: 59.3 %Skamania County59.3Franklin County: 58.6 %Franklin County58.6Walla Walla County: 58.5 %Walla Walla County58.5Benton County: 58 %Benton County58Cowlitz County: 57.3 %Cowlitz County57.3Douglas County: 57.1 %Douglas County57.1Grays Harbor County: 56.9 %Grays Harbor County56.9Chelan County: 56.8 %Chelan County56.8Yakima County: 56.8 %Yakima County56.8Grant County: 56.7 %Grant County56.7Mason County: 56.5 %Mason County56.5Klickitat County: 56.4 %Klickitat County56.4Lewis County: 56.1 %Lewis County56.1Skagit County: 55.8 %Skagit County55.8Island County: 55.3 %Island County55.3Asotin County: 54.8 %Asotin County54.8Columbia County: 54.4 %Columbia County54.4Adams County: 54.3 %Adams County54.3Okanogan County: 53.6 %Okanogan County53.6Stevens County: 53.3 %Stevens County53.3Pend Oreille County: 52.5 %Pend Oreille County52.5Wahkiakum County: 51.8 %Wahkiakum County51.8Lincoln County: 51.7 %Lincoln County51.7Pacific County: 51.3 %Pacific County51.3San Juan County: 51.3 %San Juan County51.3Ferry County: 51.3 %Ferry County51.3Clallam County: 51.2 %Clallam County51.2Garfield County: 50.5 %Garfield County50.5Jefferson County: 47.8 %Jefferson County47.8Whitman County: 69 %Whitman County69King County: 66 %King County66Kittitas County: 62.8 %Kittitas County62.8Snohomish County: 62.6 %Snohomish County62.6Pierce County: 61.9 %Pierce County61.9Whatcom County: 61.3 %Whatcom County61.3Spokane County: 60.6 %Spokane County60.6Kitsap County: 60.5 %Kitsap County60.5Clark County: 60.4 %Clark County60.4Thurston County: 59.8 %Thurston County59.8Skamania County: 59.3 %Skamania County59.3Franklin County: 58.6 %Franklin County58.6Walla Walla County: 58.5 %Walla Walla County58.5Benton County: 58 %Benton County58Cowlitz County: 57.3 %Cowlitz County57.3Douglas County: 57.1 %Douglas County57.1Grays Harbor County: 56.9 %Grays Harbor County56.9Chelan County: 56.8 %Chelan County56.8Yakima County: 56.8 %Yakima County56.8Grant County: 56.7 %Grant County56.7Mason County: 56.5 %Mason County56.5Klickitat County: 56.4 %Klickitat County56.4Lewis County: 56.1 %Lewis County56.1Skagit County: 55.8 %Skagit County55.8Island County: 55.3 %Island County55.3Asotin County: 54.8 %Asotin County54.8Columbia County: 54.4 %Columbia County54.4Adams County: 54.3 %Adams County54.3Okanogan County: 53.6 %Okanogan County53.6Stevens County: 53.3 %Stevens County53.3Pend Oreille County: 52.5 %Pend Oreille County52.5Wahkiakum County: 51.8 %Wahkiakum County51.8Lincoln County: 51.7 %Lincoln County51.7Pacific County: 51.3 %Pacific County51.3San Juan County: 51.3 %San Juan County51.3Ferry County: 51.3 %Ferry County51.3Clallam County: 51.2 %Clallam County51.2Garfield County: 50.5 %Garfield County50.5Jefferson County: 47.8 %Jefferson County47.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Whitman County69-3.3 pts
2King County66-0.3 pts
3Kittitas County62.8-1.7 pts
4Snohomish County62.6-0.2 pts
5Pierce County61.9-0.3 pts
6Whatcom County61.3-0.5 pts
7Spokane County60.6-0.2 pts
8Kitsap County60.5-0.1 pts
9Clark County60.4+0.1 pts
10Thurston County59.8-0.3 pts
11Skamania County59.3-0.3 pts
12Franklin County58.6+0.2 pts
13Walla Walla County58.5-0.7 pts
14Benton County580 pts
15Cowlitz County57.3-0.1 pts
16Douglas County57.1+0.2 pts
17Grays Harbor County56.9-0.4 pts
18Chelan County56.8-0 pts
19Yakima County56.8-0 pts
20Grant County56.7-0 pts
21Mason County56.5-0.6 pts
22Klickitat County56.4-0.4 pts
23Lewis County56.1-0 pts
24Skagit County55.8-0.2 pts
25Island County55.3-0.3 pts
26Asotin County54.8-0.5 pts
27Columbia County54.4+0.4 pts
28Adams County54.3-0.3 pts
29Okanogan County53.6-0.4 pts
30Stevens County53.3-0.7 pts
31Pend Oreille County52.5-0.3 pts
32Wahkiakum County51.8+0.7 pts
33Lincoln County51.7-0.3 pts
34Pacific County51.30 pts
35San Juan County51.3-0.1 pts
36Ferry County51.3-0.2 pts
37Clallam County51.2-0.2 pts
38Garfield County50.5-0.8 pts
39Jefferson County47.8-0.8 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 Washington by population aged 18 to 64, 2021) [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 Washington by population aged 18 to 64, 2021. 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/washington-counties?period=2021. 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 Washington by population aged 18 to 64, 2021. 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/washington-counties?period=2021.

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 Washington by population aged 18 to 64, 2021 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/washington-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_washington_by_2021,
  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 Washington by population aged 18 to 64, 2021}},
  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/washington-counties?period=2021. 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 Washington by population aged 18 to 64, 2021
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/washington-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/washington-counties?period=2021.
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?

Whitman County, with 69% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jefferson County, with 47.8% in 2021.

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.

Population aged 18 to 64: other rankings

Counties in Washington: more rankings