Data / Rankings / Median age on 1 July (US county estimates) / Counties in California

Counties in California by median age on 1 July (US county estimates)

Sierra County had the highest median age on 1 July (US county estimates) of 58 counties in 2022, at 54.3 years. Yolo County had the lowest, at 32 years. The median was 39.8 years. Source: the U.S. Census Bureau.

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Highest54.3Sierra County
Lowest32Yolo County
Median39.858 counties

Map of counties, 2022

Alameda County: 38.7 yearsAlpine County: 51 yearsAmador County: 51.3 yearsButte County: 37.5 yearsCalaveras County: 50.6 yearsColusa County: 36 yearsContra Costa County: 40.6 yearsDel Norte County: 41.1 yearsEl Dorado County: 46 yearsFresno County: 33.6 yearsGlenn County: 37.7 yearsHumboldt County: 39.7 yearsImperial County: 34.1 yearsInyo County: 44.7 yearsKern County: 33 yearsKings County: 33 yearsLake County: 44 yearsLassen County: 37.8 yearsLos Angeles County: 38.2 yearsMadera County: 34.8 yearsMarin County: 47.2 yearsMariposa County: 51 yearsMendocino County: 43.9 yearsMerced County: 32 yearsModoc County: 49.2 yearsMono County: 40.7 yearsMonterey County: 35.7 yearsNapa County: 43.4 yearsNevada County: 49.3 yearsOrange County: 39.5 yearsPlacer County: 42.4 yearsPlumas County: 53.2 yearsRiverside County: 37 yearsSacramento County: 37.4 yearsSan Benito County: 36.8 yearsSan Bernardino County: 35 yearsSan Diego County: 37.4 yearsSan Francisco County: 39.8 yearsSan Joaquin County: 35.6 yearsSan Luis Obispo County: 41.5 yearsSan Mateo County: 40.9 yearsSanta Barbara County: 35.7 yearsSanta Clara County: 38.1 yearsSanta Cruz County: 40.4 yearsShasta County: 42.3 yearsSierra County: 54.3 yearsSiskiyou County: 48.2 yearsSolano County: 39.4 yearsSonoma County: 43.2 yearsStanislaus County: 35.5 yearsSutter County: 37.1 yearsTehama County: 40.2 yearsTrinity County: 48.3 yearsTulare County: 32.5 yearsTuolumne County: 48.8 yearsVentura County: 40.1 yearsYolo County: 32 yearsYuba County: 34.5 years
  • Under 35
  • 35 to 37
  • 37 to 40
  • 40 to 42
  • 42 to 48
  • 48 and over
years, 2022. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2022

Sierra County: 54.3 yearsSierra County54.3Plumas County: 53.2 yearsPlumas County53.2Amador County: 51.3 yearsAmador County51.3Alpine County: 51 yearsAlpine County51Mariposa County: 51 yearsMariposa County51Calaveras County: 50.6 yearsCalaveras County50.6Nevada County: 49.3 yearsNevada County49.3Modoc County: 49.2 yearsModoc County49.2Tuolumne County: 48.8 yearsTuolumne County48.8Trinity County: 48.3 yearsTrinity County48.3Siskiyou County: 48.2 yearsSiskiyou County48.2Marin County: 47.2 yearsMarin County47.2El Dorado County: 46 yearsEl Dorado County46Inyo County: 44.7 yearsInyo County44.7Lake County: 44 yearsLake County44Mendocino County: 43.9 yearsMendocino County43.9Napa County: 43.4 yearsNapa County43.4Sonoma County: 43.2 yearsSonoma County43.2Placer County: 42.4 yearsPlacer County42.4Shasta County: 42.3 yearsShasta County42.3San Luis Obispo County: 41.5 yearsSan Luis Obispo County41.5Del Norte County: 41.1 yearsDel Norte County41.1San Mateo County: 40.9 yearsSan Mateo County40.9Mono County: 40.7 yearsMono County40.7Contra Costa County: 40.6 yearsContra Costa County40.6Santa Cruz County: 40.4 yearsSanta Cruz County40.4Tehama County: 40.2 yearsTehama County40.2Ventura County: 40.1 yearsVentura County40.1San Francisco County: 39.8 yearsSan Francisco County39.8Humboldt County: 39.7 yearsHumboldt County39.7Orange County: 39.5 yearsOrange County39.5Solano County: 39.4 yearsSolano County39.4Alameda County: 38.7 yearsAlameda County38.7Los Angeles County: 38.2 yearsLos Angeles County38.2Santa Clara County: 38.1 yearsSanta Clara County38.1Lassen County: 37.8 yearsLassen County37.8Glenn County: 37.7 yearsGlenn County37.7Butte County: 37.5 yearsButte County37.5Sacramento County: 37.4 yearsSacramento County37.4San Diego County: 37.4 yearsSan Diego County37.4Sutter County: 37.1 yearsSutter County37.1Riverside County: 37 yearsRiverside County37San Benito County: 36.8 yearsSan Benito County36.8Colusa County: 36 yearsColusa County36Monterey County: 35.7 yearsMonterey County35.7Santa Barbara County: 35.7 yearsSanta Barbara County35.7San Joaquin County: 35.6 yearsSan Joaquin County35.6Stanislaus County: 35.5 yearsStanislaus County35.5San Bernardino County: 35 yearsSan Bernardino County35Madera County: 34.8 yearsMadera County34.8Yuba County: 34.5 yearsYuba County34.5Imperial County: 34.1 yearsImperial County34.1Fresno County: 33.6 yearsFresno County33.6Kern County: 33 yearsKern County33Kings County: 33 yearsKings County33Tulare County: 32.5 yearsTulare County32.5Merced County: 32 yearsMerced County32Yolo County: 32 yearsYolo County32Sierra County: 54.3 yearsSierra County54.3Plumas County: 53.2 yearsPlumas County53.2Amador County: 51.3 yearsAmador County51.3Alpine County: 51 yearsAlpine County51Mariposa County: 51 yearsMariposa County51Calaveras County: 50.6 yearsCalaveras County50.6Nevada County: 49.3 yearsNevada County49.3Modoc County: 49.2 yearsModoc County49.2Tuolumne County: 48.8 yearsTuolumne County48.8Trinity County: 48.3 yearsTrinity County48.3Siskiyou County: 48.2 yearsSiskiyou County48.2Marin County: 47.2 yearsMarin County47.2El Dorado County: 46 yearsEl Dorado County46Inyo County: 44.7 yearsInyo County44.7Lake County: 44 yearsLake County44Mendocino County: 43.9 yearsMendocino County43.9Napa County: 43.4 yearsNapa County43.4Sonoma County: 43.2 yearsSonoma County43.2Placer County: 42.4 yearsPlacer County42.4Shasta County: 42.3 yearsShasta County42.3San Luis Obispo County: 41.5 yearsSan Luis Obispo County41.5Del Norte County: 41.1 yearsDel Norte County41.1San Mateo County: 40.9 yearsSan Mateo County40.9Mono County: 40.7 yearsMono County40.7Contra Costa County: 40.6 yearsContra Costa County40.6Santa Cruz County: 40.4 yearsSanta Cruz County40.4Tehama County: 40.2 yearsTehama County40.2Ventura County: 40.1 yearsVentura County40.1San Francisco County: 39.8 yearsSan Francisco County39.8Humboldt County: 39.7 yearsHumboldt County39.7Orange County: 39.5 yearsOrange County39.5Solano County: 39.4 yearsSolano County39.4Alameda County: 38.7 yearsAlameda County38.7Los Angeles County: 38.2 yearsLos Angeles County38.2Santa Clara County: 38.1 yearsSanta Clara County38.1Lassen County: 37.8 yearsLassen County37.8Glenn County: 37.7 yearsGlenn County37.7Butte County: 37.5 yearsButte County37.5Sacramento County: 37.4 yearsSacramento County37.4San Diego County: 37.4 yearsSan Diego County37.4Sutter County: 37.1 yearsSutter County37.1Riverside County: 37 yearsRiverside County37San Benito County: 36.8 yearsSan Benito County36.8Colusa County: 36 yearsColusa County36Monterey County: 35.7 yearsMonterey County35.7Santa Barbara County: 35.7 yearsSanta Barbara County35.7San Joaquin County: 35.6 yearsSan Joaquin County35.6Stanislaus County: 35.5 yearsStanislaus County35.5San Bernardino County: 35 yearsSan Bernardino County35Madera County: 34.8 yearsMadera County34.8Yuba County: 34.5 yearsYuba County34.5Imperial County: 34.1 yearsImperial County34.1Fresno County: 33.6 yearsFresno County33.6Kern County: 33 yearsKern County33Kings County: 33 yearsKings County33Tulare County: 32.5 yearsTulare County32.5Merced County: 32 yearsMerced County32Yolo County: 32 yearsYolo County32
years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

RankCounties2022
years		Change on 2021
1Sierra County54.3+0.6
2Plumas County53.2+0.6
3Amador County51.3-0.1
4Alpine County51-0.1
4Mariposa County51-0.7
6Calaveras County50.6-0.4
7Nevada County49.30
8Modoc County49.2-0.5
9Tuolumne County48.80
10Trinity County48.3+0.6
11Siskiyou County48.2-0.1
12Marin County47.2+0.4
13El Dorado County460
14Inyo County44.7+0.2
15Lake County44-0.2
16Mendocino County43.9+0.5
17Napa County43.4+0.4
18Sonoma County43.2+0.2
19Placer County42.4+0.1
20Shasta County42.30
21San Luis Obispo County41.5-0.3
22Del Norte County41.1+0.7
23San Mateo County40.9+0.3
24Mono County40.7+0.5
25Contra Costa County40.6+0.3
26Santa Cruz County40.4-0.9
27Tehama County40.2-0.3
28Ventura County40.1+0.3
29San Francisco County39.8+0.1
30Humboldt County39.7+0.1
31Orange County39.5+0.3
32Solano County39.4+0.3
33Alameda County38.7+0.3
34Los Angeles County38.2+0.2
35Santa Clara County38.10
36Lassen County37.8+0.5
37Glenn County37.7-0.1
38Butte County37.5-0.6
39Sacramento County37.4+0.3
39San Diego County37.4+0.1
41Sutter County37.10
42Riverside County37+0.2
43San Benito County36.8+0.2
44Colusa County36+0.2
45Monterey County35.7+0.4
45Santa Barbara County35.7-0.6
47San Joaquin County35.6+0.2
48Stanislaus County35.5+0.1
49San Bernardino County35+0.2
50Madera County34.80
51Yuba County34.5+0.2
52Imperial County34.1+0.1
53Fresno County33.6+0.2
54Kern County33+0.2
54Kings County33+0.2
56Tulare County32.5+0.2
57Merced County32+0.1
57Yolo County32-1.6

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in California by median age on 1 July (US county estimates), 2022) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in California by median age on 1 July (US county estimates), 2022. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/california-counties?period=2022. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in California by median age on 1 July (US county estimates), 2022. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/california-counties?period=2022.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in California by median age on 1 July (US county estimates), 2022 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/california-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_california_by_2022,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in California by median age on 1 July (US county estimates), 2022}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/california-counties?period=2022. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in California by median age on 1 July (US county estimates), 2022
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/median-age-july-1-us-counties/california-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/california-counties?period=2022.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest median age on 1 July (US county estimates)?

Sierra County, with 54.3 years in 2022, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Yolo County, with 32 years in 2022.

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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Median age on 1 July (US county estimates): other rankings

Counties in California: more rankings