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

Counties in California by share of population aged 65 and over

Sierra County had the highest share of population aged 65 and over of 58 counties in 2024, at 33.5%. Kings County had the lowest, at 12%. The median was 18.9% and the figure for California was 17%. Source: the U.S. Census Bureau.

Highest33.5Sierra County
Lowest12Kings County
Median18.958 counties
California17History

All counties, 2024

CSVChart (SVG)

Sierra CountySierra County: 33.5 %33.5Plumas CountyPlumas County: 33.3 %33.3Mariposa CountyMariposa County: 30.6 %30.6Calaveras CountyCalaveras County: 30.2 %30.2Amador CountyAmador County: 29.9 %29.9Nevada CountyNevada County: 29.9 %29.9Siskiyou CountySiskiyou County: 29.7 %29.7Tuolumne CountyTuolumne County: 29.6 %29.6Modoc CountyModoc County: 29.5 %29.5Alpine CountyAlpine County: 29.5 %29.5Trinity CountyTrinity County: 29.2 %29.2Inyo CountyInyo County: 26 %26Mendocino CountyMendocino County: 25.8 %25.8El Dorado CountyEl Dorado County: 25.3 %25.3Marin CountyMarin County: 25.1 %25.1Lake CountyLake County: 24.6 %24.6San Luis Obispo CountySan Luis Obispo County: 24.5 %24.5Shasta CountyShasta County: 23.7 %23.7Sonoma CountySonoma County: 23.5 %23.5Napa CountyNapa County: 23.2 %23.2Placer CountyPlacer County: 21.9 %21.9Humboldt CountyHumboldt County: 21.7 %21.7Tehama CountyTehama County: 21.5 %21.5Del Norte CountyDel Norte County: 21.5 %21.5Santa Cruz CountySanta Cruz County: 21.4 %21.4Butte CountyButte County: 20.5 %20.5Mono CountyMono County: 19.6 %19.6Ventura CountyVentura County: 19.3 %19.3San Mateo CountySan Mateo County: 19 %19Solano CountySolano County: 18.8 %18.8San Francisco CountySan Francisco County: 18.7 %18.7Contra Costa CountyContra Costa County: 18.6 %18.6Santa Barbara CountySanta Barbara County: 18.5 %18.5Lassen CountyLassen County: 18.5 %18.5Glenn CountyGlenn County: 18.3 %18.3Orange CountyOrange County: 17.8 %17.8Sutter CountySutter County: 17.4 %17.4San Diego CountySan Diego County: 17 %17Riverside CountyRiverside County: 16.7 %16.7Sacramento CountySacramento County: 16.6 %16.6Colusa CountyColusa County: 16.6 %16.6Alameda CountyAlameda County: 16.5 %16.5Los Angeles CountyLos Angeles County: 16.5 %16.5Monterey CountyMonterey County: 16.1 %16.1Santa Clara CountySanta Clara County: 15.8 %15.8Yolo CountyYolo County: 15.3 %15.3Stanislaus CountyStanislaus County: 15.2 %15.2Madera CountyMadera County: 15.2 %15.2San Benito CountySan Benito County: 15 %15Imperial CountyImperial County: 14.8 %14.8San Joaquin CountySan Joaquin County: 14.7 %14.7Yuba CountyYuba County: 14.2 %14.2Fresno CountyFresno County: 14.2 %14.2San Bernardino CountySan Bernardino County: 14.1 %14.1Tulare CountyTulare County: 13.2 %13.2Kern CountyKern County: 13 %13Merced CountyMerced County: 12.7 %12.7Kings CountyKings County: 12 %12
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2024 (%)Change on 2023
1Sierra County33.5+1.5 pts
2Plumas County33.3+0.6 pts
3Mariposa County30.6+0.4 pts
4Calaveras County30.2+0.8 pts
5Amador County29.9+0.3 pts
6Nevada County29.9+0.4 pts
7Siskiyou County29.7+0.6 pts
8Tuolumne County29.6+0.4 pts
9Modoc County29.5+0.4 pts
10Alpine County29.5+1.3 pts
11Trinity County29.2+1 pts
12Inyo County26+0.6 pts
13Mendocino County25.8+0.6 pts
14El Dorado County25.3+0.8 pts
15Marin County25.1+0.5 pts
16Lake County24.6+0.5 pts
17San Luis Obispo County24.5+0.5 pts
18Shasta County23.7+0.4 pts
19Sonoma County23.5+0.6 pts
20Napa County23.2+0.6 pts
21Placer County21.9+0.3 pts
22Humboldt County21.7+0.7 pts
23Tehama County21.5+0.5 pts
24Del Norte County21.5-0.1 pts
25Santa Cruz County21.4+0.8 pts
26Butte County20.5+0.4 pts
27Mono County19.6+1.1 pts
28Ventura County19.3+0.5 pts
29San Mateo County19+0.4 pts
30Solano County18.8+0.4 pts
31San Francisco County18.7+0.3 pts
32Contra Costa County18.6+0.4 pts
33Santa Barbara County18.5+0.4 pts
34Lassen County18.5+0.5 pts
35Glenn County18.3+0.2 pts
36Orange County17.8+0.5 pts
37Sutter County17.4+0.3 pts
38San Diego County17+0.5 pts
39Riverside County16.7+0.4 pts
40Sacramento County16.6+0.4 pts
41Colusa County16.6+0.4 pts
42Alameda County16.5+0.5 pts
43Los Angeles County16.5+0.5 pts
44Monterey County16.1+0.5 pts
45Santa Clara County15.8+0.4 pts
46Yolo County15.3+0.3 pts
47Stanislaus County15.2+0.3 pts
48Madera County15.2+0.1 pts
49San Benito County15+0.5 pts
50Imperial County14.8+0.3 pts
51San Joaquin County14.7+0.3 pts
52Yuba County14.2+0.2 pts
53Fresno County14.2+0.3 pts
54San Bernardino County14.1+0.4 pts
55Tulare County13.2+0.3 pts
56Kern County13+0.3 pts
57Merced County12.7+0.3 pts
58Kings County12+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?

Sierra County, with 33.5% in 2024, according to the U.S. Census Bureau.

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

Kings County, with 12% 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 California: more rankings