RANKING · 2020 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 2020

California counties with the youngest median age (2020 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 39.1.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

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 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS