RANKING · 2010 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 2010

California counties with the youngest median age (2010 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 37.1.

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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, CACA297,26029.6+2%

02Tulare County, CACA485,14629.6+1%

03Yolo County, CACA224,41030.4+3%

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

05Kern County, CACA927,06830.70%

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