Data / Rankings / Population aged 65 and over / Counties in Washington

Counties in Washington by share of population aged 65 and over

Jefferson County had the highest share of population aged 65 and over of 39 counties in 2021, at 40.4%. Franklin County had the lowest, at 10.2%. The median was 21.7% and the figure for Washington was 16.8%. Source: the U.S. Census Bureau.

Highest40.4Jefferson County
Lowest10.2Franklin County
Median21.739 counties
Washington16.8History

All counties, 2021

CSVChart (SVG)

Jefferson CountyJefferson County: 40.4 %40.4San Juan CountySan Juan County: 34.9 %34.9Clallam CountyClallam County: 32.6 %32.6Wahkiakum CountyWahkiakum County: 32.2 %32.2Pacific CountyPacific County: 32.2 %32.2Ferry CountyFerry County: 30.1 %30.1Columbia CountyColumbia County: 28.9 %28.9Pend Oreille CountyPend Oreille County: 28.1 %28.1Island CountyIsland County: 27.1 %27.1Garfield CountyGarfield County: 27.1 %27.1Lincoln CountyLincoln County: 27 %27Stevens CountyStevens County: 25.4 %25.4Asotin CountyAsotin County: 24.9 %24.9Klickitat CountyKlickitat County: 24.5 %24.5Okanogan CountyOkanogan County: 24.5 %24.5Mason CountyMason County: 24.4 %24.4Grays Harbor CountyGrays Harbor County: 23.2 %23.2Skagit CountySkagit County: 22.9 %22.9Skamania CountySkamania County: 22.8 %22.8Lewis CountyLewis County: 21.7 %21.7Chelan CountyChelan County: 21.1 %21.1Walla Walla CountyWalla Walla County: 20.7 %20.7Cowlitz CountyCowlitz County: 20.2 %20.2Kitsap CountyKitsap County: 19.7 %19.7Whatcom CountyWhatcom County: 19.4 %19.4Kittitas CountyKittitas County: 19 %19Thurston CountyThurston County: 18.9 %18.9Douglas CountyDouglas County: 18.5 %18.5Spokane CountySpokane County: 17.7 %17.7Clark CountyClark County: 16.9 %16.9Benton CountyBenton County: 16.1 %16.1Pierce CountyPierce County: 15.2 %15.2Grant CountyGrant County: 14.9 %14.9Snohomish CountySnohomish County: 14.9 %14.9Yakima CountyYakima County: 14.9 %14.9King CountyKing County: 14.1 %14.1Whitman CountyWhitman County: 13.6 %13.6Adams CountyAdams County: 11.8 %11.8Franklin CountyFranklin County: 10.2 %10.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2021 (%)Change on 2020
1Jefferson County40.4+1 pts
2San Juan County34.9+0.2 pts
3Clallam County32.6+0.4 pts
4Wahkiakum County32.2+0.1 pts
5Pacific County32.2+0.4 pts
6Ferry County30.1+0.6 pts
7Columbia County28.9-0.1 pts
8Pend Oreille County28.1+0.3 pts
9Island County27.1+0.8 pts
10Garfield County27.1-0.3 pts
11Lincoln County27+0.2 pts
12Stevens County25.4+0.7 pts
13Asotin County24.9+0.6 pts
14Klickitat County24.5+0.7 pts
15Okanogan County24.5+0.4 pts
16Mason County24.4+0.6 pts
17Grays Harbor County23.2+0.6 pts
18Skagit County22.9+0.5 pts
19Skamania County22.8+0.8 pts
20Lewis County21.7+0.1 pts
21Chelan County21.1+0.5 pts
22Walla Walla County20.7+0.7 pts
23Cowlitz County20.2+0.4 pts
24Kitsap County19.7+0.7 pts
25Whatcom County19.4+0.7 pts
26Kittitas County19+1.3 pts
27Thurston County18.9+0.5 pts
28Douglas County18.5+0.4 pts
29Spokane County17.7+0.4 pts
30Clark County16.9+0.4 pts
31Benton County16.1+0.3 pts
32Pierce County15.2+0.5 pts
33Grant County14.9+0.3 pts
34Snohomish County14.9+0.5 pts
35Yakima County14.9+0.3 pts
36King County14.1+0.5 pts
37Whitman County13.6+1.5 pts
38Adams County11.8+0.3 pts
39Franklin County10.2+0.3 pts

Other periods

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

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 (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

Use this data in your AI agent

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Rank Counties in Washington by share of population aged 65 and over using official data, and cite the source.
rank_places {"indicator":"population_65_plus_share","level":"province","within":"Washington","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=Washington&limit=10

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Questions

Which county has the highest share of population aged 65 and over?

Jefferson County, with 40.4% in 2021, according to the U.S. Census Bureau.

Which county has the lowest share of population aged 65 and over?

Franklin County, with 10.2% 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 (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. Retrieved 2026-10-09.

Population aged 65 and over: other rankings

Counties in Washington: more rankings