RANKING · 2010 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 2010

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, CACA297,26029.6+2%

02Tulare County, CACA485,14629.6+1%

03Yolo County, CACA224,41030.4+3%

04Fresno County, CACA1,035,45630.6+2%

05Kern County, CACA927,06830.7+0%

06Kings County, CACA154,32731.1+3%

07San Bernardino County, CACA2,224,09131.7+5%

08Imperial County, CACA181,41131.9+3%

09Yuba County, CACA88,69132.1+2%

10San Joaquin County, CACA823,81532.7+3%

11Monterey County, CACA433,72932.9+4%

12Stanislaus County, CACA557,71932.9+4%

13Madera County, CACA167,92733.0+1%

14Colusa County, CACA21,83633.5+6%

15Santa Barbara County, CACA442,06533.6+1%

16Riverside County, CACA2,544,91633.7+2%

17San Benito County, CACA70,08234.3+9%

18Sutter County, CACA98,78734.5+1%

19San Diego County, CACA3,282,24834.6+4%

20Los Angeles County, CACA9,694,93434.8+9%

21Sacramento County, CACA1,618,46034.8+3%

22Glenn County, CACA28,14135.3+5%

23Orange County, CACA3,149,50736.2+9%

24Santa Clara County, CACA1,914,39136.2+6%

25Ventura County, CACA830,85136.2+6%

26Alameda County, CACA1,636,63036.6+6%

27Santa Cruz County, CACA258,85236.9+5%

28Solano County, CACA455,37636.9+9%

29Humboldt County, CACA131,64737.1+2%

30Lassen County, CACA28,11737.1+7%

31Butte County, CACA209,21137.2+4%

32Mono County, CACA12,50537.2+3%

33Contra Costa County, CACA1,170,07038.5+6%

34San Francisco County, CACA826,07938.5+5%

35Del Norte County, CACA26,41039.1+7%

36San Mateo County, CACA743,56839.3+7%

37San Luis Obispo County, CACA282,36739.4+6%

38Tehama County, CACA64,66539.5+4%

39Napa County, CACA132,94939.7+4%

40Sonoma County, CACA486,44439.9+6%

41Placer County, CACA442,08140.3+6%

42Mendocino County, CACA88,12241.5+7%

43Shasta County, CACA181,64841.8+7%

44El Dorado County, CACA192,32343.6+11%

45Marin County, CACA253,69444.5+8%

46Lake County, CACA67,77245.0+5%

47Inyo County, CACA18,15845.6+7%

48Modoc County, CACA8,42646.1+10%

49Alpine County, CACA1,04346.7+19%

50Siskiyou County, CACA42,01347.0+9%

51Tuolumne County, CACA53,16047.3+10%

52Nevada County, CACA101,91147.6+10%

53Amador County, CACA41,87648.2+13%

54Calaveras County, CACA46,60549.2+10%

55Mariposa County, CACA16,91849.2+15%

56Trinity County, CACA15,72049.3+11%

57Plumas County, CACA18,58349.6+12%

58Sierra County, CACA3,09850.9+16%

SHOWING 1–58 OF 58

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