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

Counties in California by share of population aged 65 and over, 2025

Sierra County had the highest share of population aged 65 and over of 58 counties in 2025, at 34.6%. Kings County had the lowest, at 12.4%. The median was 19.4% and the figure for California was 17.5%. Source: the U.S. Census Bureau.

Highest34.6Sierra County
Lowest12.4Kings County
Median19.458 counties
California17.5History

All counties, 2025

CSVChart (SVG)

Sierra CountySierra County: 34.6 %34.6Plumas CountyPlumas County: 33.9 %33.9Mariposa CountyMariposa County: 31.1 %31.1Calaveras CountyCalaveras County: 30.8 %30.8Tuolumne CountyTuolumne County: 30.5 %30.5Alpine CountyAlpine County: 30.5 %30.5Amador CountyAmador County: 30.5 %30.5Nevada CountyNevada County: 30.4 %30.4Siskiyou CountySiskiyou County: 30.2 %30.2Modoc CountyModoc County: 30.1 %30.1Trinity CountyTrinity County: 30.1 %30.1Inyo CountyInyo County: 26.4 %26.4Mendocino CountyMendocino County: 26.4 %26.4El Dorado CountyEl Dorado County: 26.2 %26.2Marin CountyMarin County: 25.7 %25.7Lake CountyLake County: 25.1 %25.1San Luis Obispo CountySan Luis Obispo County: 24.9 %24.9Sonoma CountySonoma County: 24.2 %24.2Shasta CountyShasta County: 24.1 %24.1Napa CountyNapa County: 23.7 %23.7Humboldt CountyHumboldt County: 22.3 %22.3Santa Cruz CountySanta Cruz County: 22.2 %22.2Placer CountyPlacer County: 22.2 %22.2Del Norte CountyDel Norte County: 22.2 %22.2Tehama CountyTehama County: 22 %22Butte CountyButte County: 21 %21Mono CountyMono County: 20.2 %20.2Ventura CountyVentura County: 20 %20San Mateo CountySan Mateo County: 19.4 %19.4Lassen CountyLassen County: 19.4 %19.4Solano CountySolano County: 19.3 %19.3Contra Costa CountyContra Costa County: 19.1 %19.1Santa Barbara CountySanta Barbara County: 19 %19San Francisco CountySan Francisco County: 18.8 %18.8Glenn CountyGlenn County: 18.8 %18.8Orange CountyOrange County: 18.5 %18.5Sutter CountySutter County: 17.8 %17.8San Diego CountySan Diego County: 17.5 %17.5Riverside CountyRiverside County: 17.1 %17.1Los Angeles CountyLos Angeles County: 17.1 %17.1Colusa CountyColusa County: 17.1 %17.1Sacramento CountySacramento County: 17 %17Alameda CountyAlameda County: 17 %17Monterey CountyMonterey County: 16.5 %16.5Santa Clara CountySanta Clara County: 16.3 %16.3Yolo CountyYolo County: 15.6 %15.6Stanislaus CountyStanislaus County: 15.6 %15.6Madera CountyMadera County: 15.4 %15.4San Benito CountySan Benito County: 15.4 %15.4Imperial CountyImperial County: 15.3 %15.3San Joaquin CountySan Joaquin County: 15 %15San Bernardino CountySan Bernardino County: 14.6 %14.6Fresno CountyFresno County: 14.6 %14.6Yuba CountyYuba County: 14.4 %14.4Tulare CountyTulare County: 13.5 %13.5Kern CountyKern County: 13.4 %13.4Merced CountyMerced County: 13.1 %13.1Kings CountyKings County: 12.4 %12.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2025 (%)Change on 2024
1Sierra County34.6+1.1 pts
2Plumas County33.9+0.6 pts
3Mariposa County31.1+0.5 pts
4Calaveras County30.8+0.5 pts
5Tuolumne County30.5+1 pts
6Alpine County30.5+1 pts
7Amador County30.5+0.5 pts
8Nevada County30.4+0.5 pts
9Siskiyou County30.2+0.5 pts
10Modoc County30.1+0.6 pts
11Trinity County30.1+0.9 pts
12Inyo County26.4+0.5 pts
13Mendocino County26.4+0.7 pts
14El Dorado County26.2+0.8 pts
15Marin County25.7+0.7 pts
16Lake County25.1+0.5 pts
17San Luis Obispo County24.9+0.5 pts
18Sonoma County24.2+0.7 pts
19Shasta County24.1+0.4 pts
20Napa County23.7+0.5 pts
21Humboldt County22.3+0.5 pts
22Santa Cruz County22.2+0.8 pts
23Placer County22.2+0.3 pts
24Del Norte County22.2+0.7 pts
25Tehama County22+0.5 pts
26Butte County21+0.4 pts
27Mono County20.2+0.6 pts
28Ventura County20+0.6 pts
29San Mateo County19.4+0.4 pts
30Lassen County19.4+0.9 pts
31Solano County19.3+0.6 pts
32Contra Costa County19.1+0.5 pts
33Santa Barbara County19+0.4 pts
34San Francisco County18.8+0.2 pts
35Glenn County18.8+0.5 pts
36Orange County18.5+0.6 pts
37Sutter County17.8+0.4 pts
38San Diego County17.5+0.5 pts
39Riverside County17.1+0.5 pts
40Los Angeles County17.1+0.6 pts
41Colusa County17.1+0.5 pts
42Sacramento County17+0.4 pts
43Alameda County17+0.5 pts
44Monterey County16.5+0.4 pts
45Santa Clara County16.3+0.5 pts
46Yolo County15.6+0.3 pts
47Stanislaus County15.6+0.3 pts
48Madera County15.4+0.2 pts
49San Benito County15.4+0.4 pts
50Imperial County15.3+0.5 pts
51San Joaquin County15+0.3 pts
52San Bernardino County14.6+0.4 pts
53Fresno County14.6+0.4 pts
54Yuba County14.4+0.2 pts
55Tulare County13.5+0.3 pts
56Kern County13.4+0.4 pts
57Merced County13.1+0.4 pts
58Kings County12.4+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 34.6% in 2025, according to the U.S. Census Bureau.

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

Kings County, with 12.4% in 2025.

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