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 2023, at 71%. Jefferson County had the lowest, at 45.9%. The median was 56.1% and the figure for Washington was 61.4%. Source: the U.S. Census Bureau.

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Highest71Whitman County
Lowest45.9Jefferson County
Median56.139 counties
Washington61.4History

Map of counties, 2023

Adams County: 54.7 %Asotin County: 54.3 %Benton County: 57.8 %Chelan County: 56.1 %Clallam County: 50.1 %Clark County: 60.4 %Columbia County: 53.5 %Cowlitz County: 56.9 %Douglas County: 57.2 %Ferry County: 50.8 %Franklin County: 59.1 %Garfield County: 50.6 %Grant County: 56.9 %Grays Harbor County: 56.2 %Island County: 54.2 %Jefferson County: 45.9 %King County: 66.1 %Kitsap County: 59.7 %Kittitas County: 63.2 %Klickitat County: 56.1 %Lewis County: 55.7 %Lincoln County: 51.4 %Mason County: 55.7 %Okanogan County: 53.7 %Pacific County: 50.8 %Pend Oreille County: 51.7 %Pierce County: 61.5 %San Juan County: 50.1 %Skagit County: 55.1 %Skamania County: 58.4 %Snohomish County: 62.4 %Spokane County: 60.2 %Stevens County: 52.6 %Thurston County: 59.5 %Wahkiakum County: 50.4 %Walla Walla County: 58.1 %Whatcom County: 61.5 %Whitman County: 71 %Yakima County: 56.9 %
  • Under 51
  • 51 to 54
  • 54 to 56
  • 56 to 58
  • 58 to 60
  • 60 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2023

Whitman County: 71 %Whitman County71King County: 66.1 %King County66.1Kittitas County: 63.2 %Kittitas County63.2Snohomish County: 62.4 %Snohomish County62.4Pierce County: 61.5 %Pierce County61.5Whatcom County: 61.5 %Whatcom County61.5Clark County: 60.4 %Clark County60.4Spokane County: 60.2 %Spokane County60.2Kitsap County: 59.7 %Kitsap County59.7Thurston County: 59.5 %Thurston County59.5Franklin County: 59.1 %Franklin County59.1Skamania County: 58.4 %Skamania County58.4Walla Walla County: 58.1 %Walla Walla County58.1Benton County: 57.8 %Benton County57.8Douglas County: 57.2 %Douglas County57.2Yakima County: 56.9 %Yakima County56.9Grant County: 56.9 %Grant County56.9Cowlitz County: 56.9 %Cowlitz County56.9Grays Harbor County: 56.2 %Grays Harbor County56.2Klickitat County: 56.1 %Klickitat County56.1Chelan County: 56.1 %Chelan County56.1Lewis County: 55.7 %Lewis County55.7Mason County: 55.7 %Mason County55.7Skagit County: 55.1 %Skagit County55.1Adams County: 54.7 %Adams County54.7Asotin County: 54.3 %Asotin County54.3Island County: 54.2 %Island County54.2Okanogan County: 53.7 %Okanogan County53.7Columbia County: 53.5 %Columbia County53.5Stevens County: 52.6 %Stevens County52.6Pend Oreille County: 51.7 %Pend Oreille County51.7Lincoln County: 51.4 %Lincoln County51.4Ferry County: 50.8 %Ferry County50.8Pacific County: 50.8 %Pacific County50.8Garfield County: 50.6 %Garfield County50.6Wahkiakum County: 50.4 %Wahkiakum County50.4Clallam County: 50.1 %Clallam County50.1San Juan County: 50.1 %San Juan County50.1Jefferson County: 45.9 %Jefferson County45.9Whitman County: 71 %Whitman County71King County: 66.1 %King County66.1Kittitas County: 63.2 %Kittitas County63.2Snohomish County: 62.4 %Snohomish County62.4Pierce County: 61.5 %Pierce County61.5Whatcom County: 61.5 %Whatcom County61.5Clark County: 60.4 %Clark County60.4Spokane County: 60.2 %Spokane County60.2Kitsap County: 59.7 %Kitsap County59.7Thurston County: 59.5 %Thurston County59.5Franklin County: 59.1 %Franklin County59.1Skamania County: 58.4 %Skamania County58.4Walla Walla County: 58.1 %Walla Walla County58.1Benton County: 57.8 %Benton County57.8Douglas County: 57.2 %Douglas County57.2Yakima County: 56.9 %Yakima County56.9Grant County: 56.9 %Grant County56.9Cowlitz County: 56.9 %Cowlitz County56.9Grays Harbor County: 56.2 %Grays Harbor County56.2Klickitat County: 56.1 %Klickitat County56.1Chelan County: 56.1 %Chelan County56.1Lewis County: 55.7 %Lewis County55.7Mason County: 55.7 %Mason County55.7Skagit County: 55.1 %Skagit County55.1Adams County: 54.7 %Adams County54.7Asotin County: 54.3 %Asotin County54.3Island County: 54.2 %Island County54.2Okanogan County: 53.7 %Okanogan County53.7Columbia County: 53.5 %Columbia County53.5Stevens County: 52.6 %Stevens County52.6Pend Oreille County: 51.7 %Pend Oreille County51.7Lincoln County: 51.4 %Lincoln County51.4Ferry County: 50.8 %Ferry County50.8Pacific County: 50.8 %Pacific County50.8Garfield County: 50.6 %Garfield County50.6Wahkiakum County: 50.4 %Wahkiakum County50.4Clallam County: 50.1 %Clallam County50.1San Juan County: 50.1 %San Juan County50.1Jefferson County: 45.9 %Jefferson County45.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Whitman County71-0.4 pts
2King County66.10 pts
3Kittitas County63.2-0.4 pts
4Snohomish County62.4-0.1 pts
5Pierce County61.5-0.2 pts
6Whatcom County61.5-0 pts
7Clark County60.4+0.1 pts
8Spokane County60.2-0.2 pts
9Kitsap County59.7-0.4 pts
10Thurston County59.5-0.1 pts
11Franklin County59.1+0.3 pts
12Skamania County58.4-0.5 pts
13Walla Walla County58.1-0.2 pts
14Benton County57.8-0.1 pts
15Douglas County57.20 pts
16Yakima County56.9+0.1 pts
17Grant County56.9+0.2 pts
18Cowlitz County56.9-0.1 pts
19Grays Harbor County56.2-0.2 pts
20Klickitat County56.1-0.1 pts
21Chelan County56.1-0.4 pts
22Lewis County55.7-0.2 pts
23Mason County55.7-0.4 pts
24Skagit County55.1-0.3 pts
25Adams County54.7+0.3 pts
26Asotin County54.3-0.3 pts
27Island County54.2-0.4 pts
28Okanogan County53.7+0.1 pts
29Columbia County53.5-0.7 pts
30Stevens County52.6-0.4 pts
31Pend Oreille County51.7-0.4 pts
32Lincoln County51.4-0.1 pts
33Ferry County50.8-0.5 pts
34Pacific County50.8-0.3 pts
35Garfield County50.6+0.7 pts
36Wahkiakum County50.4-0.8 pts
37Clallam County50.1-0.3 pts
38San Juan County50.1-0.5 pts
39Jefferson County45.9-0.8 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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_washington_by_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/washington-counties?period=2023.
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 71% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jefferson County, with 45.9% in 2023.

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