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 2023, at 42.9%. Franklin County had the lowest, at 10.8%. The median was 22.3% and the figure for Washington was 17.6%. Source: the U.S. Census Bureau.

Highest42.9Jefferson County
Lowest10.8Franklin County
Median22.339 counties
Washington17.6History

All counties, 2023

CSVChart (SVG)

Jefferson CountyJefferson County: 42.9 %42.9San Juan CountySan Juan County: 36.8 %36.8Clallam CountyClallam County: 34.2 %34.2Pacific CountyPacific County: 33.8 %33.8Wahkiakum CountyWahkiakum County: 33 %33Ferry CountyFerry County: 30 %30Columbia CountyColumbia County: 29.8 %29.8Island CountyIsland County: 28.9 %28.9Pend Oreille CountyPend Oreille County: 28.6 %28.6Lincoln CountyLincoln County: 27.7 %27.7Garfield CountyGarfield County: 27.3 %27.3Stevens CountyStevens County: 26.5 %26.5Asotin CountyAsotin County: 26.3 %26.3Klickitat CountyKlickitat County: 25.6 %25.6Mason CountyMason County: 25.3 %25.3Okanogan CountyOkanogan County: 24.9 %24.9Grays Harbor CountyGrays Harbor County: 24.3 %24.3Skamania CountySkamania County: 24.2 %24.2Skagit CountySkagit County: 24.1 %24.1Lewis CountyLewis County: 22.3 %22.3Chelan CountyChelan County: 22 %22Walla Walla CountyWalla Walla County: 21.8 %21.8Kitsap CountyKitsap County: 21 %21Cowlitz CountyCowlitz County: 21 %21Whatcom CountyWhatcom County: 20.1 %20.1Thurston CountyThurston County: 19.9 %19.9Douglas CountyDouglas County: 19.5 %19.5Kittitas CountyKittitas County: 19.5 %19.5Spokane CountySpokane County: 18.6 %18.6Clark CountyClark County: 17.7 %17.7Benton CountyBenton County: 16.8 %16.8Pierce CountyPierce County: 16 %16Snohomish CountySnohomish County: 15.8 %15.8Grant CountyGrant County: 15.5 %15.5Yakima CountyYakima County: 15.4 %15.4King CountyKing County: 14.7 %14.7Whitman CountyWhitman County: 12.9 %12.9Adams CountyAdams County: 12.1 %12.1Franklin CountyFranklin County: 10.8 %10.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2023 (%)Change on 2022
1Jefferson County42.9+1.3 pts
2San Juan County36.8+1 pts
3Clallam County34.2+0.5 pts
4Pacific County33.8+0.9 pts
5Wahkiakum County33+0.5 pts
6Ferry County30+0.3 pts
7Columbia County29.8+0.4 pts
8Island County28.9+0.8 pts
9Pend Oreille County28.6+0.3 pts
10Lincoln County27.7+0.4 pts
11Garfield County27.3+0.2 pts
12Stevens County26.5+0.5 pts
13Asotin County26.3+0.7 pts
14Klickitat County25.6+0.5 pts
15Mason County25.3+0.5 pts
16Okanogan County24.9+0.2 pts
17Grays Harbor County24.3+0.5 pts
18Skamania County24.2+0.7 pts
19Skagit County24.1+0.6 pts
20Lewis County22.3+0.3 pts
21Chelan County22+0.4 pts
22Walla Walla County21.8+0.5 pts
23Kitsap County21+0.7 pts
24Cowlitz County21+0.3 pts
25Whatcom County20.1+0.4 pts
26Thurston County19.9+0.5 pts
27Douglas County19.5+0.4 pts
28Kittitas County19.5+0.5 pts
29Spokane County18.6+0.5 pts
30Clark County17.7+0.3 pts
31Benton County16.8+0.4 pts
32Pierce County16+0.4 pts
33Snohomish County15.8+0.4 pts
34Grant County15.5+0.2 pts
35Yakima County15.4+0.3 pts
36King County14.7+0.3 pts
37Whitman County12.9+0.2 pts
38Adams County12.1+0.1 pts
39Franklin County10.8+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

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 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 42.9% in 2023, according to the U.S. Census Bureau.

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

Franklin County, with 10.8% 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 (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