RANKING · 1990 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 1990

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, CACA297,26028.1−3%

02Kings County, CACA154,32728.4−6%

03Imperial County, CACA181,41128.8−7%

04Yolo County, CACA224,41028.9−2%

05San Bernardino County, CACA2,224,09129.4−3%

06Fresno County, CACA1,035,45629.5−1%

07Tulare County, CACA485,14629.5+1%

08Yuba County, CACA88,69129.7−5%

09Kern County, CACA927,06829.8−3%

10Monterey County, CACA433,72929.8−6%

11Stanislaus County, CACA557,71930.7−3%

12San Benito County, CACA70,08230.7−2%

13Los Angeles County, CACA9,694,93430.8−4%

14Solano County, CACA455,37631.0−9%

15San Joaquin County, CACA823,81531.0−3%

16San Diego County, CACA3,282,24831.0−7%

17Orange County, CACA3,149,50731.5−5%

18Riverside County, CACA2,544,91631.7−4%

19Santa Barbara County, CACA442,06531.8−5%

20Ventura County, CACA830,85131.8−7%

21Lassen County, CACA28,11731.9−8%

22Sacramento County, CACA1,618,46032.0−5%

23Santa Clara County, CACA1,914,39132.0−6%

24Madera County, CACA167,92732.1−2%

25Colusa County, CACA21,83632.2+2%

26Del Norte County, CACA26,41032.3−11%

27Mono County, CACA12,50532.3−10%

28Sutter County, CACA98,78732.5−5%

29Glenn County, CACA28,14132.5−4%

30Alameda County, CACA1,636,63032.9−5%

31Humboldt County, CACA131,64733.2−8%

32San Luis Obispo County, CACA282,36733.3−11%

33Santa Cruz County, CACA258,85233.3−5%

34Alpine County, CACA1,04333.6−14%

35Butte County, CACA209,21134.0−5%

36Contra Costa County, CACA1,170,07034.2−6%

37Sonoma County, CACA486,44434.9−7%

38Shasta County, CACA181,64834.9−10%

39San Mateo County, CACA743,56835.0−5%

40Placer County, CACA442,08135.2−7%

41Mendocino County, CACA88,12235.5−9%

42El Dorado County, CACA192,32335.6−10%

43San Francisco County, CACA826,07936.0−1%

44Tehama County, CACA64,66536.0−5%

45Napa County, CACA132,94936.5−5%

46Siskiyou County, CACA42,01337.2−13%

47Modoc County, CACA8,42637.2−11%

48Tuolumne County, CACA53,16037.3−13%

49Amador County, CACA41,87637.9−11%

50Trinity County, CACA15,72037.9−15%

51Marin County, CACA253,69438.2−8%

52Inyo County, CACA18,15838.9−9%

53Plumas County, CACA18,58339.0−12%

54Nevada County, CACA101,91139.4−9%

55Mariposa County, CACA16,91839.5−8%

56Calaveras County, CACA46,60539.8−11%

57Lake County, CACA67,77240.7−5%

58Sierra County, CACA3,09843.7+0%

SHOWING 1–58 OF 58

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