RANKING · 1990 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 1990

California counties with the youngest median age (1990 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

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 –

01Merced County, CACA297,26028.1–

02Kings County, CACA154,32728.4–

03Imperial County, CACA181,41128.8–

04Yolo County, CACA224,41028.9–

05San Bernardino County, CACA2,224,09129.4–

06Fresno County, CACA1,035,45629.5–

07Tulare County, CACA485,14629.5–

08Yuba County, CACA88,69129.7–

09Kern County, CACA927,06829.8–

10Monterey County, CACA433,72929.8–

11Stanislaus County, CACA557,71930.7–

12San Benito County, CACA70,08230.7–

13Los Angeles County, CACA9,694,93430.8–

14Solano County, CACA455,37631.0–

15San Joaquin County, CACA823,81531.0–

16San Diego County, CACA3,282,24831.0–

17Orange County, CACA3,149,50731.5–

18Riverside County, CACA2,544,91631.7–

19Santa Barbara County, CACA442,06531.8–

20Ventura County, CACA830,85131.8–

21Lassen County, CACA28,11731.9–

22Sacramento County, CACA1,618,46032.0–

23Santa Clara County, CACA1,914,39132.0–

24Madera County, CACA167,92732.1–

25Colusa County, CACA21,83632.2–

26Del Norte County, CACA26,41032.3–

27Mono County, CACA12,50532.3–

28Sutter County, CACA98,78732.5–

29Glenn County, CACA28,14132.5–

30Alameda County, CACA1,636,63032.9–

31Humboldt County, CACA131,64733.2–

32San Luis Obispo County, CACA282,36733.3–

33Santa Cruz County, CACA258,85233.3–

34Alpine County, CACA1,04333.6–

35Butte County, CACA209,21134.0–

36Contra Costa County, CACA1,170,07034.2–

37Sonoma County, CACA486,44434.9–

38Shasta County, CACA181,64834.9–

39San Mateo County, CACA743,56835.0–

40Placer County, CACA442,08135.2–

41Mendocino County, CACA88,12235.5–

42El Dorado County, CACA192,32335.6–

43San Francisco County, CACA826,07936.0–

44Tehama County, CACA64,66536.0–

45Napa County, CACA132,94936.5–

46Siskiyou County, CACA42,01337.2–

47Modoc County, CACA8,42637.2–

48Tuolumne County, CACA53,16037.3–

49Amador County, CACA41,87637.9–

50Trinity County, CACA15,72037.9–

51Marin County, CACA253,69438.2–

52Inyo County, CACA18,15838.9–

53Plumas County, CACA18,58339.0–

54Nevada County, CACA101,91139.4–

55Mariposa County, CACA16,91839.5–

56Calaveras County, CACA46,60539.8–

57Lake County, CACA67,77240.7–

58Sierra County, CACA3,09843.7–

SHOWING 1–58 OF 58

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS