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 2014, at 74.1%. Wahkiakum County had the lowest, at 52.9%. The median was 58.6% and the figure for Washington was 63.2%. Source: the U.S. Census Bureau.

Highest74.1Whitman County
Lowest52.9Wahkiakum County
Median58.639 counties
Washington63.2History

All counties, 2014

Whitman County: 74.1 %Whitman County74.1King County: 66.9 %King County66.9Kittitas County: 65.9 %Kittitas County65.9Snohomish County: 64.6 %Snohomish County64.6Whatcom County: 63.9 %Whatcom County63.9Pierce County: 63.5 %Pierce County63.5Kitsap County: 62.9 %Kitsap County62.9Spokane County: 62.7 %Spokane County62.7Thurston County: 62.5 %Thurston County62.5Skamania County: 61.9 %Skamania County61.9Walla Walla County: 61.5 %Walla Walla County61.5Clark County: 61 %Clark County61Grays Harbor County: 60.1 %Grays Harbor County60.1Benton County: 59.9 %Benton County59.9Mason County: 59.7 %Mason County59.7Cowlitz County: 59 %Cowlitz County59Franklin County: 58.7 %Franklin County58.7Klickitat County: 58.6 %Klickitat County58.6Island County: 58.6 %Island County58.6Chelan County: 58.6 %Chelan County58.6Skagit County: 58.5 %Skagit County58.5Douglas County: 58.2 %Douglas County58.2Lewis County: 58.1 %Lewis County58.1Ferry County: 58.1 %Ferry County58.1Asotin County: 57.8 %Asotin County57.8Yakima County: 57.6 %Yakima County57.6Grant County: 57.4 %Grant County57.4Stevens County: 57.1 %Stevens County57.1Pend Oreille County: 56.8 %Pend Oreille County56.8Okanogan County: 56.7 %Okanogan County56.7San Juan County: 56 %San Juan County56Garfield County: 55.6 %Garfield County55.6Clallam County: 55.2 %Clallam County55.2Adams County: 55 %Adams County55Columbia County: 55 %Columbia County55Lincoln County: 54.6 %Lincoln County54.6Pacific County: 54.6 %Pacific County54.6Jefferson County: 54.4 %Jefferson County54.4Wahkiakum County: 52.9 %Wahkiakum County52.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2014 (%)Change on 2013
1Whitman County74.1-0.5 pts
2King County66.9-0.2 pts
3Kittitas County65.9-0.5 pts
4Snohomish County64.6-0.2 pts
5Whatcom County63.9-0.5 pts
6Pierce County63.5-0.2 pts
7Kitsap County62.9-0.4 pts
8Spokane County62.7-0.3 pts
9Thurston County62.5-0.5 pts
10Skamania County61.9-0.6 pts
11Walla Walla County61.5-0.2 pts
12Clark County61-0.2 pts
13Grays Harbor County60.1-0.6 pts
14Benton County59.9-0.4 pts
15Mason County59.7-0.4 pts
16Cowlitz County59-0.3 pts
17Franklin County58.7-0.2 pts
18Klickitat County58.6-0.3 pts
19Island County58.6-0.5 pts
20Chelan County58.6-0.3 pts
21Skagit County58.5-0.6 pts
22Douglas County58.2-0.1 pts
23Lewis County58.1-0.5 pts
24Ferry County58.1-1.4 pts
25Asotin County57.8-0.4 pts
26Yakima County57.6-0.2 pts
27Grant County57.4+0.1 pts
28Stevens County57.1-0.5 pts
29Pend Oreille County56.8-0.4 pts
30Okanogan County56.7-0.5 pts
31San Juan County56-1.4 pts
32Garfield County55.6-0.9 pts
33Clallam County55.2-0.7 pts
34Adams County55-0.1 pts
35Columbia County55-1.3 pts
36Lincoln County54.6-0.9 pts
37Pacific County54.6-0.2 pts
38Jefferson County54.4-1.1 pts
39Wahkiakum County52.9+0.1 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, 2014) [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, 2014. 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=2014. 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, 2014. 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=2014.

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, 2014 [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=2014 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_washington_by_2014,
  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, 2014}},
  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=2014. 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, 2014
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=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/washington-counties?period=2014.
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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Washington by population aged 18 to 64 using official data, and cite the source.
rank_places {"indicator":"population_18_64_share","level":"province","within":"Washington","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_18_64_share&level=province&within=Washington&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population aged 18 to 64?

Whitman County, with 74.1% in 2014, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Wahkiakum County, with 52.9% in 2014.

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