RANKING · 2020 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 2020

California counties with the youngest median age (2023 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide.

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RELATEDOldest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Merced County, CACA297,26032.0+10%

02Tulare County, CACA485,14632.3+11%

03Kern County, CACA927,06832.8+7%

04Kings County, CACA154,32732.9+9%

05Fresno County, CACA1,035,45633.3+11%

06Yolo County, CACA224,41033.3+13%

07Yuba County, CACA88,69134.3+9%

08Imperial County, CACA181,41134.6+12%

09San Bernardino County, CACA2,224,09134.9+15%

10Madera County, CACA167,92735.0+7%

11Monterey County, CACA433,72935.0+10%

12San Joaquin County, CACA823,81535.4+11%

13Colusa County, CACA21,83635.5+13%

14Stanislaus County, CACA557,71935.5+12%

15Santa Barbara County, CACA442,06535.7+7%

16San Benito County, CACA70,08236.6+17%

17Riverside County, CACA2,544,91636.8+11%

18Sacramento County, CACA1,618,46036.9+9%

19Sutter County, CACA98,78736.9+8%

20San Diego County, CACA3,282,24837.1+12%

21Lassen County, CACA28,11737.2+8%

22Glenn County, CACA28,14137.5+11%

23Los Angeles County, CACA9,694,93437.5+17%

24Santa Clara County, CACA1,914,39137.5+10%

25Alameda County, CACA1,636,63037.7+9%

26Butte County, CACA209,21137.9+6%

27San Francisco County, CACA826,07938.2+5%

28Orange County, CACA3,149,50739.0+17%

29Solano County, CACA455,37639.0+15%

30Humboldt County, CACA131,64739.1+8%

31Mono County, CACA12,50539.5+10%

32Ventura County, CACA830,85139.5+15%

33San Mateo County, CACA743,56839.9+8%

34Contra Costa County, CACA1,170,07040.1+10%

35Del Norte County, CACA26,41040.2+10%

36Santa Cruz County, CACA258,85240.2+15%

37Tehama County, CACA64,66540.4+7%

38San Luis Obispo County, CACA282,36741.4+11%

39Placer County, CACA442,08142.4+12%

40Sonoma County, CACA486,44442.6+14%

41Shasta County, CACA181,64842.8+10%

42Napa County, CACA132,94942.9+12%

43Mendocino County, CACA88,12243.2+11%

44Inyo County, CACA18,15844.8+5%

45Lake County, CACA67,77245.0+5%

46El Dorado County, CACA192,32346.3+18%

47Marin County, CACA253,69446.5+13%

48Trinity County, CACA15,72047.6+7%

49Siskiyou County, CACA42,01348.5+13%

50Modoc County, CACA8,42648.7+17%

51Tuolumne County, CACA53,16048.9+14%

52Nevada County, CACA101,91149.7+15%

53Alpine County, CACA1,04350.1+27%

54Amador County, CACA41,87651.6+21%

55Calaveras County, CACA46,60551.6+16%

56Mariposa County, CACA16,91852.1+21%

57Plumas County, CACA18,58353.0+20%

58Sierra County, CACA3,09853.9+23%

SHOWING 1–58 OF 58

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES