RANKING · 2000 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 2000

California counties with the youngest median age (2000 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 35.8.

Flip the list · Oldest by median age, US counties →

CaliforniaAll states All rankings

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 1990

01Merced County, CACA297,26029.0+3%

02Tulare County, CACA485,14629.2−1%

03Yolo County, CACA224,41029.5+2%

04Fresno County, CACA1,035,45629.9+1%

05Kings County, CACA154,32730.2+6%

06San Bernardino County, CACA2,224,09130.3+3%

07Kern County, CACA927,06830.6+3%

08Imperial County, CACA181,41131.0+8%

09San Benito County, CACA70,08231.4+2%

10Yuba County, CACA88,69131.4+6%

11Colusa County, CACA21,83631.5−2%

12Monterey County, CACA433,72931.7+6%

13Stanislaus County, CACA557,71931.7+3%

14San Joaquin County, CACA823,81531.9+3%

15Los Angeles County, CACA9,694,93432.0+4%

16Madera County, CACA167,92732.7+2%

17Riverside County, CACA2,544,91633.1+5%

18San Diego County, CACA3,282,24833.2+7%

19Orange County, CACA3,149,50733.3+6%

20Santa Barbara County, CACA442,06533.4+5%

21Glenn County, CACA28,14133.7+4%

22Sacramento County, CACA1,618,46033.8+6%

23Solano County, CACA455,37633.9+9%

24Santa Clara County, CACA1,914,39134.0+6%

25Sutter County, CACA98,78734.1+5%

26Ventura County, CACA830,85134.2+7%

27Alameda County, CACA1,636,63034.5+5%

28Lassen County, CACA28,11734.6+8%

29Santa Cruz County, CACA258,85235.0+5%

30Butte County, CACA209,21135.8+5%

31Mono County, CACA12,50536.0+11%

32Humboldt County, CACA131,64736.3+9%

33Contra Costa County, CACA1,170,07036.4+6%

34Del Norte County, CACA26,41036.4+13%

35San Francisco County, CACA826,07936.5+1%

36San Mateo County, CACA743,56836.8+5%

37San Luis Obispo County, CACA282,36737.3+12%

38Sonoma County, CACA486,44437.5+8%

39Tehama County, CACA64,66537.8+5%

40Placer County, CACA442,08138.0+8%

41Napa County, CACA132,94938.3+5%

42Mendocino County, CACA88,12238.9+9%

43Shasta County, CACA181,64838.9+12%

44Alpine County, CACA1,04339.3+17%

45El Dorado County, CACA192,32339.4+11%

46Marin County, CACA253,69441.3+8%

47Modoc County, CACA8,42641.8+12%

48Amador County, CACA41,87642.7+13%

49Lake County, CACA67,77242.7+5%

50Inyo County, CACA18,15842.8+10%

51Mariposa County, CACA16,91842.9+9%

52Tuolumne County, CACA53,16042.9+15%

53Siskiyou County, CACA42,01343.0+16%

54Nevada County, CACA101,91143.1+9%

55Sierra County, CACA3,09843.70%

56Plumas County, CACA18,58344.2+13%

57Calaveras County, CACA46,60544.6+12%

58Trinity County, CACA15,72044.6+18%

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)

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