RANKING · 2024 ACS · 58 SHOWN OF 58

Youngest by median age, California counties

California counties with the youngest median age (2024 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 39.8. Biggest climber in the top 100 since 2020: Alpine County, CA, up 23 places to #30.

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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, CACA297,26031.8+10%

02Tulare County, CACA485,14632.1+10%

03▲3Yolo County, CACA224,41032.1+9%

04Kings County, CACA154,32732.5+8%

05▼2Kern County, CACA927,06832.7+7%

06▲2Imperial County, CACA181,41133.2+7%

07▼2Fresno County, CACA1,035,45633.5+12%

08▼1Yuba County, CACA88,69134.2+9%

09▲1Madera County, CACA167,92734.6+6%

10▲5Santa Barbara County, CACA442,06534.6+4%

11▼2San Bernardino County, CACA2,224,09134.7+15%

12▲2Stanislaus County, CACA557,71934.9+10%

13▼1San Joaquin County, CACA823,81535.4+11%

14▼3Monterey County, CACA433,72935.5+12%

15▼2Colusa County, CACA21,83635.9+14%

16San Benito County, CACA70,08236.1+15%

17▲9Butte County, CACA209,21136.2+1%

18▲4Glenn County, CACA28,14136.2+7%

19Sutter County, CACA98,78736.5+7%

20▼3Riverside County, CACA2,544,91637.0+12%

21▼1San Diego County, CACA3,282,24837.3+12%

22▼4Sacramento County, CACA1,618,46037.5+11%

23▲1Santa Clara County, CACA1,914,39138.1+12%

24▼1Los Angeles County, CACA9,694,93438.2+19%

25▼4Lassen County, CACA28,11738.3+11%

26▼1Alameda County, CACA1,636,63039.0+13%

27▲2Solano County, CACA455,37639.2+16%

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

29▲3Ventura County, CACA830,85139.6+16%

30▲23Alpine County, CACA1,04339.8+1%

31▲5Santa Cruz County, CACA258,85239.8+14%

32▲3Del Norte County, CACA26,41039.9+10%

33▼3Humboldt County, CACA131,64739.9+10%

34▼7San Francisco County, CACA826,07940.0+10%

35▲2Tehama County, CACA64,66540.0+6%

36▲2San Luis Obispo County, CACA282,36740.4+8%

37▼3Contra Costa County, CACA1,170,07040.5+11%

38▼5San Mateo County, CACA743,56840.9+11%

39▼8Mono County, CACA12,50541.5+15%

40▲1Shasta County, CACA181,64841.7+7%

41▼2Placer County, CACA442,08142.5+12%

42Napa County, CACA132,94942.9+12%

43▼3Sonoma County, CACA486,44442.9+14%

44▲1Lake County, CACA67,77244.1+3%

45▼2Mendocino County, CACA88,12244.1+13%

46▼2Inyo County, CACA18,15845.5+6%

47▼1El Dorado County, CACA192,32346.1+17%

48▲1Siskiyou County, CACA42,01347.2+10%

49▼2Marin County, CACA253,69447.4+15%

50Modoc County, CACA8,42647.5+14%

51Tuolumne County, CACA53,16048.4+13%

52▲2Amador County, CACA41,87649.7+16%

53▼1Nevada County, CACA101,91150.1+16%

54▲2Mariposa County, CACA16,91851.2+19%

55Calaveras County, CACA46,60552.0+17%

56▲1Plumas County, CACA18,58352.0+18%

57▲1Sierra County, CACA3,09854.7+25%

58▼10Trinity County, CACA15,72054.9+23%

SHOWING 1–58 OF 58

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES