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 2016, at 73.7%. Wahkiakum County had the lowest, at 51.7%. The median was 57.9% and the figure for Washington was 62.8%. Source: the U.S. Census Bureau.

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Highest73.7Whitman County
Lowest51.7Wahkiakum County
Median57.939 counties
Washington62.8History

Map of counties, 2016

Adams County: 55 %Asotin County: 57.1 %Benton County: 59.1 %Chelan County: 58.1 %Clallam County: 54.1 %Clark County: 60.7 %Columbia County: 54.3 %Cowlitz County: 58.3 %Douglas County: 57.4 %Ferry County: 56 %Franklin County: 58.4 %Garfield County: 54 %Grant County: 57.1 %Grays Harbor County: 59.2 %Island County: 57.9 %Jefferson County: 52.3 %King County: 66.7 %Kitsap County: 62.2 %Kittitas County: 64.9 %Klickitat County: 58.1 %Lewis County: 57.3 %Lincoln County: 53.5 %Mason County: 58.6 %Okanogan County: 55.8 %Pacific County: 53.8 %Pend Oreille County: 55.8 %Pierce County: 63.1 %San Juan County: 54.4 %Skagit County: 57.7 %Skamania County: 61.7 %Snohomish County: 64.1 %Spokane County: 62 %Stevens County: 56 %Thurston County: 61.7 %Wahkiakum County: 51.7 %Walla Walla County: 61 %Whatcom County: 63.1 %Whitman County: 73.7 %Yakima County: 57.4 %
  • Under 54
  • 54 to 57
  • 57 to 58
  • 58 to 59
  • 59 to 62
  • 62 and over
%, 2016. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2016

Whitman County: 73.7 %Whitman County73.7King County: 66.7 %King County66.7Kittitas County: 64.9 %Kittitas County64.9Snohomish County: 64.1 %Snohomish County64.1Whatcom County: 63.1 %Whatcom County63.1Pierce County: 63.1 %Pierce County63.1Kitsap County: 62.2 %Kitsap County62.2Spokane County: 62 %Spokane County62Skamania County: 61.7 %Skamania County61.7Thurston County: 61.7 %Thurston County61.7Walla Walla County: 61 %Walla Walla County61Clark County: 60.7 %Clark County60.7Grays Harbor County: 59.2 %Grays Harbor County59.2Benton County: 59.1 %Benton County59.1Mason County: 58.6 %Mason County58.6Franklin County: 58.4 %Franklin County58.4Cowlitz County: 58.3 %Cowlitz County58.3Klickitat County: 58.1 %Klickitat County58.1Chelan County: 58.1 %Chelan County58.1Island County: 57.9 %Island County57.9Skagit County: 57.7 %Skagit County57.7Douglas County: 57.4 %Douglas County57.4Yakima County: 57.4 %Yakima County57.4Lewis County: 57.3 %Lewis County57.3Grant County: 57.1 %Grant County57.1Asotin County: 57.1 %Asotin County57.1Stevens County: 56 %Stevens County56Ferry County: 56 %Ferry County56Okanogan County: 55.8 %Okanogan County55.8Pend Oreille County: 55.8 %Pend Oreille County55.8Adams County: 55 %Adams County55San Juan County: 54.4 %San Juan County54.4Columbia County: 54.3 %Columbia County54.3Clallam County: 54.1 %Clallam County54.1Garfield County: 54 %Garfield County54Pacific County: 53.8 %Pacific County53.8Lincoln County: 53.5 %Lincoln County53.5Jefferson County: 52.3 %Jefferson County52.3Wahkiakum County: 51.7 %Wahkiakum County51.7Whitman County: 73.7 %Whitman County73.7King County: 66.7 %King County66.7Kittitas County: 64.9 %Kittitas County64.9Snohomish County: 64.1 %Snohomish County64.1Whatcom County: 63.1 %Whatcom County63.1Pierce County: 63.1 %Pierce County63.1Kitsap County: 62.2 %Kitsap County62.2Spokane County: 62 %Spokane County62Skamania County: 61.7 %Skamania County61.7Thurston County: 61.7 %Thurston County61.7Walla Walla County: 61 %Walla Walla County61Clark County: 60.7 %Clark County60.7Grays Harbor County: 59.2 %Grays Harbor County59.2Benton County: 59.1 %Benton County59.1Mason County: 58.6 %Mason County58.6Franklin County: 58.4 %Franklin County58.4Cowlitz County: 58.3 %Cowlitz County58.3Klickitat County: 58.1 %Klickitat County58.1Chelan County: 58.1 %Chelan County58.1Island County: 57.9 %Island County57.9Skagit County: 57.7 %Skagit County57.7Douglas County: 57.4 %Douglas County57.4Yakima County: 57.4 %Yakima County57.4Lewis County: 57.3 %Lewis County57.3Grant County: 57.1 %Grant County57.1Asotin County: 57.1 %Asotin County57.1Stevens County: 56 %Stevens County56Ferry County: 56 %Ferry County56Okanogan County: 55.8 %Okanogan County55.8Pend Oreille County: 55.8 %Pend Oreille County55.8Adams County: 55 %Adams County55San Juan County: 54.4 %San Juan County54.4Columbia County: 54.3 %Columbia County54.3Clallam County: 54.1 %Clallam County54.1Garfield County: 54 %Garfield County54Pacific County: 53.8 %Pacific County53.8Lincoln County: 53.5 %Lincoln County53.5Jefferson County: 52.3 %Jefferson County52.3Wahkiakum County: 51.7 %Wahkiakum County51.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1Whitman County73.7-0.4 pts
2King County66.7-0.1 pts
3Kittitas County64.9-0.2 pts
4Snohomish County64.1-0.2 pts
5Whatcom County63.1-0.5 pts
6Pierce County63.1-0.1 pts
7Kitsap County62.2-0.5 pts
8Spokane County62-0.3 pts
9Skamania County61.7-0.2 pts
10Thurston County61.7-0.4 pts
11Walla Walla County61-0.4 pts
12Clark County60.7-0.2 pts
13Grays Harbor County59.2-0.4 pts
14Benton County59.1-0.3 pts
15Mason County58.6-0.4 pts
16Franklin County58.4-0.2 pts
17Cowlitz County58.3-0.3 pts
18Klickitat County58.1-0.1 pts
19Chelan County58.1-0.2 pts
20Island County57.9-0.4 pts
21Skagit County57.7-0.3 pts
22Douglas County57.4-0.3 pts
23Yakima County57.4-0.2 pts
24Lewis County57.3-0.3 pts
25Grant County57.1-0 pts
26Asotin County57.1-0.5 pts
27Stevens County56-0.6 pts
28Ferry County56-1.5 pts
29Okanogan County55.8-0.3 pts
30Pend Oreille County55.8-0.1 pts
31Adams County55-0.2 pts
32San Juan County54.4-0.9 pts
33Columbia County54.3-0.5 pts
34Clallam County54.1-0.5 pts
35Garfield County54-1 pts
36Pacific County53.8-0.5 pts
37Lincoln County53.5-0.1 pts
38Jefferson County52.3-0.8 pts
39Wahkiakum County51.7-0.7 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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_washington_by_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/washington-counties?period=2016.
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 73.7% in 2016, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Wahkiakum County, with 51.7% in 2016.

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