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 2024, at 43.6%. Franklin County had the lowest, at 11.1%. The median was 22.5% and the figure for Washington was 17.9%. Source: the U.S. Census Bureau.

Highest43.6Jefferson County
Lowest11.1Franklin County
Median22.539 counties
Washington17.9History

All counties, 2024

CSVChart (SVG)

Jefferson CountyJefferson County: 43.6 %43.6San Juan CountySan Juan County: 37.8 %37.8Clallam CountyClallam County: 34.6 %34.6Pacific CountyPacific County: 34.3 %34.3Wahkiakum CountyWahkiakum County: 33.8 %33.8Columbia CountyColumbia County: 30.8 %30.8Ferry CountyFerry County: 29.9 %29.9Island CountyIsland County: 29.6 %29.6Pend Oreille CountyPend Oreille County: 29 %29Lincoln CountyLincoln County: 28.2 %28.2Garfield CountyGarfield County: 27.6 %27.6Stevens CountyStevens County: 27.3 %27.3Asotin CountyAsotin County: 26.7 %26.7Klickitat CountyKlickitat County: 26 %26Mason CountyMason County: 25.5 %25.5Skamania CountySkamania County: 25.1 %25.1Okanogan CountyOkanogan County: 24.9 %24.9Grays Harbor CountyGrays Harbor County: 24.9 %24.9Skagit CountySkagit County: 24.5 %24.5Lewis CountyLewis County: 22.5 %22.5Chelan CountyChelan County: 22.4 %22.4Walla Walla CountyWalla Walla County: 21.9 %21.9Kitsap CountyKitsap County: 21.5 %21.5Cowlitz CountyCowlitz County: 21.2 %21.2Whatcom CountyWhatcom County: 20.5 %20.5Thurston CountyThurston County: 20.2 %20.2Kittitas CountyKittitas County: 20 %20Douglas CountyDouglas County: 19.8 %19.8Spokane CountySpokane County: 19 %19Clark CountyClark County: 18.1 %18.1Benton CountyBenton County: 17 %17Pierce CountyPierce County: 16.3 %16.3Snohomish CountySnohomish County: 16.1 %16.1Yakima CountyYakima County: 15.7 %15.7Grant CountyGrant County: 15.6 %15.6King CountyKing County: 14.9 %14.9Whitman CountyWhitman County: 13.2 %13.2Adams CountyAdams County: 12.1 %12.1Franklin CountyFranklin County: 11.1 %11.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2024 (%)Change on 2023
1Jefferson County43.6+0.7 pts
2San Juan County37.8+1 pts
3Clallam County34.6+0.5 pts
4Pacific County34.3+0.5 pts
5Wahkiakum County33.8+0.7 pts
6Columbia County30.8+1 pts
7Ferry County29.9-0.2 pts
8Island County29.6+0.7 pts
9Pend Oreille County29+0.4 pts
10Lincoln County28.2+0.5 pts
11Garfield County27.6+0.2 pts
12Stevens County27.3+0.7 pts
13Asotin County26.7+0.5 pts
14Klickitat County26+0.4 pts
15Mason County25.5+0.2 pts
16Skamania County25.1+0.9 pts
17Okanogan County24.90 pts
18Grays Harbor County24.9+0.5 pts
19Skagit County24.5+0.4 pts
20Lewis County22.5+0.3 pts
21Chelan County22.4+0.3 pts
22Walla Walla County21.9+0.1 pts
23Kitsap County21.5+0.4 pts
24Cowlitz County21.2+0.3 pts
25Whatcom County20.5+0.4 pts
26Thurston County20.2+0.3 pts
27Kittitas County20+0.5 pts
28Douglas County19.8+0.2 pts
29Spokane County19+0.4 pts
30Clark County18.1+0.4 pts
31Benton County17+0.3 pts
32Pierce County16.3+0.3 pts
33Snohomish County16.1+0.3 pts
34Yakima County15.7+0.2 pts
35Grant County15.6+0.1 pts
36King County14.9+0.2 pts
37Whitman County13.2+0.4 pts
38Adams County12.1-0 pts
39Franklin County11.1+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

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

Questions

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

Jefferson County, with 43.6% in 2024, according to the U.S. Census Bureau.

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

Franklin County, with 11.1% in 2024.

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