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

Counties in California by share of population aged 65 and over

Plumas County had the highest share of population aged 65 and over of 58 counties in 2023, at 32.7%. Kings County had the lowest, at 11.6%. The median was 18.4% and the figure for California was 16.6%. Source: the U.S. Census Bureau.

Highest32.7Plumas County
Lowest11.6Kings County
Median18.458 counties
California16.6History

All counties, 2023

CSVChart (SVG)

Plumas CountyPlumas County: 32.7 %32.7Sierra CountySierra County: 32 %32Mariposa CountyMariposa County: 30.3 %30.3Amador CountyAmador County: 29.6 %29.6Nevada CountyNevada County: 29.5 %29.5Calaveras CountyCalaveras County: 29.4 %29.4Tuolumne CountyTuolumne County: 29.1 %29.1Modoc CountyModoc County: 29.1 %29.1Siskiyou CountySiskiyou County: 29 %29Trinity CountyTrinity County: 28.2 %28.2Alpine CountyAlpine County: 28.1 %28.1Inyo CountyInyo County: 25.4 %25.4Mendocino CountyMendocino County: 25.2 %25.2Marin CountyMarin County: 24.6 %24.6El Dorado CountyEl Dorado County: 24.5 %24.5Lake CountyLake County: 24.1 %24.1San Luis Obispo CountySan Luis Obispo County: 23.9 %23.9Shasta CountyShasta County: 23.4 %23.4Sonoma CountySonoma County: 22.9 %22.9Napa CountyNapa County: 22.6 %22.6Del Norte CountyDel Norte County: 21.6 %21.6Placer CountyPlacer County: 21.6 %21.6Humboldt CountyHumboldt County: 21 %21Tehama CountyTehama County: 21 %21Santa Cruz CountySanta Cruz County: 20.7 %20.7Butte CountyButte County: 20.1 %20.1Ventura CountyVentura County: 18.8 %18.8San Mateo CountySan Mateo County: 18.6 %18.6Mono CountyMono County: 18.4 %18.4San Francisco CountySan Francisco County: 18.4 %18.4Solano CountySolano County: 18.3 %18.3Glenn CountyGlenn County: 18.1 %18.1Contra Costa CountyContra Costa County: 18.1 %18.1Santa Barbara CountySanta Barbara County: 18.1 %18.1Lassen CountyLassen County: 18 %18Orange CountyOrange County: 17.3 %17.3Sutter CountySutter County: 17.1 %17.1San Diego CountySan Diego County: 16.5 %16.5Riverside CountyRiverside County: 16.3 %16.3Sacramento CountySacramento County: 16.3 %16.3Colusa CountyColusa County: 16.2 %16.2Alameda CountyAlameda County: 16.1 %16.1Los Angeles CountyLos Angeles County: 16 %16Monterey CountyMonterey County: 15.6 %15.6Santa Clara CountySanta Clara County: 15.4 %15.4Madera CountyMadera County: 15.1 %15.1Yolo CountyYolo County: 15 %15Stanislaus CountyStanislaus County: 15 %15San Benito CountySan Benito County: 14.6 %14.6Imperial CountyImperial County: 14.5 %14.5San Joaquin CountySan Joaquin County: 14.5 %14.5Yuba CountyYuba County: 14 %14Fresno CountyFresno County: 13.9 %13.9San Bernardino CountySan Bernardino County: 13.7 %13.7Tulare CountyTulare County: 12.9 %12.9Kern CountyKern County: 12.7 %12.7Merced CountyMerced County: 12.4 %12.4Kings CountyKings County: 11.6 %11.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2023 (%)Change on 2022
1Plumas County32.7+1 pts
2Sierra County32+0.6 pts
3Mariposa County30.3+0.7 pts
4Amador County29.6+0.4 pts
5Nevada County29.5+0.7 pts
6Calaveras County29.4+0.6 pts
7Tuolumne County29.1+0.2 pts
8Modoc County29.1+0.5 pts
9Siskiyou County29+0.8 pts
10Trinity County28.2+1.3 pts
11Alpine County28.1+1.9 pts
12Inyo County25.4+0.7 pts
13Mendocino County25.2+0.7 pts
14Marin County24.6+0.6 pts
15El Dorado County24.5+0.8 pts
16Lake County24.1+0.6 pts
17San Luis Obispo County23.9+0.7 pts
18Shasta County23.4+0.4 pts
19Sonoma County22.9+0.6 pts
20Napa County22.6+0.6 pts
21Del Norte County21.6+0.6 pts
22Placer County21.6+0.4 pts
23Humboldt County21+0.5 pts
24Tehama County21+0.3 pts
25Santa Cruz County20.7+0.8 pts
26Butte County20.1+0.4 pts
27Ventura County18.8+0.6 pts
28San Mateo County18.6+0.4 pts
29Mono County18.4+0.5 pts
30San Francisco County18.4+0.3 pts
31Solano County18.3+0.5 pts
32Glenn County18.1+0.3 pts
33Contra Costa County18.1+0.5 pts
34Santa Barbara County18.1+0.5 pts
35Lassen County18+1.3 pts
36Orange County17.3+0.6 pts
37Sutter County17.1+0.3 pts
38San Diego County16.5+0.5 pts
39Riverside County16.3+0.4 pts
40Sacramento County16.3+0.4 pts
41Colusa County16.2+0.2 pts
42Alameda County16.1+0.5 pts
43Los Angeles County16+0.5 pts
44Monterey County15.6+0.5 pts
45Santa Clara County15.4+0.4 pts
46Madera County15.1+0.2 pts
47Yolo County15+0.5 pts
48Stanislaus County15+0.3 pts
49San Benito County14.6+0.4 pts
50Imperial County14.5+0.4 pts
51San Joaquin County14.5+0.3 pts
52Yuba County14+0.2 pts
53Fresno County13.9+0.3 pts
54San Bernardino County13.7+0.4 pts
55Tulare County12.9+0.3 pts
56Kern County12.7+0.4 pts
57Merced County12.4+0.2 pts
58Kings County11.6+0.4 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 California 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":"California","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=California&limit=10

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Questions

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

Plumas County, with 32.7% in 2023, according to the U.S. Census Bureau.

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

Kings County, with 11.6% 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 California: more rankings