RANKING · 2024 ACS · 58 SHOWN OF 58

Youngest by median age, California counties

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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SAME RANKING BYCities States Metros ZIP codes

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, CACA297,26031.8+10%

02Tulare County, CACA485,14632.1+10%

03Yolo County, CACA224,41032.1+9%

04Kings County, CACA154,32732.5+8%

05Kern County, CACA927,06832.7+7%

06Imperial County, CACA181,41133.2+7%

07Fresno County, CACA1,035,45633.5+12%

08Yuba County, CACA88,69134.2+9%

09Madera County, CACA167,92734.6+6%

10Santa Barbara County, CACA442,06534.6+4%

11San Bernardino County, CACA2,224,09134.7+15%

12Stanislaus County, CACA557,71934.9+10%

13San Joaquin County, CACA823,81535.4+11%

14Monterey County, CACA433,72935.5+12%

15Colusa County, CACA21,83635.9+14%

16San Benito County, CACA70,08236.1+15%

17Butte County, CACA209,21136.2+1%

18Glenn County, CACA28,14136.2+7%

19Sutter County, CACA98,78736.5+7%

20Riverside County, CACA2,544,91637.0+12%

21San Diego County, CACA3,282,24837.3+12%

22Sacramento County, CACA1,618,46037.5+11%

23Santa Clara County, CACA1,914,39138.1+12%

24Los Angeles County, CACA9,694,93438.2+19%

25Lassen County, CACA28,11738.3+11%

26Alameda County, CACA1,636,63039.0+13%

27Solano County, CACA455,37639.2+16%

28Orange County, CACA3,149,50739.4+18%

29Ventura County, CACA830,85139.6+16%

30Alpine County, CACA1,04339.8+1%

31Santa Cruz County, CACA258,85239.8+14%

32Del Norte County, CACA26,41039.9+10%

33Humboldt County, CACA131,64739.9+10%

34San Francisco County, CACA826,07940.0+10%

35Tehama County, CACA64,66540.0+6%

36San Luis Obispo County, CACA282,36740.4+8%

37Contra Costa County, CACA1,170,07040.5+11%

38San Mateo County, CACA743,56840.9+11%

39Mono County, CACA12,50541.5+15%

40Shasta County, CACA181,64841.7+7%

41Placer County, CACA442,08142.5+12%

42Napa County, CACA132,94942.9+12%

43Sonoma County, CACA486,44442.9+14%

44Lake County, CACA67,77244.1+3%

45Mendocino County, CACA88,12244.1+13%

46Inyo County, CACA18,15845.5+6%

47El Dorado County, CACA192,32346.1+17%

48Siskiyou County, CACA42,01347.2+10%

49Marin County, CACA253,69447.4+15%

50Modoc County, CACA8,42647.5+14%

51Tuolumne County, CACA53,16048.4+13%

52Amador County, CACA41,87649.7+16%

53Nevada County, CACA101,91150.1+16%

54Mariposa County, CACA16,91851.2+19%

55Calaveras County, CACA46,60552.0+17%

56Plumas County, CACA18,58352.0+18%

57Sierra County, CACA3,09854.7+25%

58Trinity County, CACA15,72054.9+23%

SHOWING 1–58 OF 58

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