RANKING · 2000 CENSUS · 58 SHOWN OF 58

Oldest by median age, California counties · 2000

California counties ranked by median age of residents (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.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 1990

01Calaveras County, CACA46,60544.6+12%

02Trinity County, CACA15,72044.6+18%

03Plumas County, CACA18,58344.2+13%

04Sierra County, CACA3,09843.70%

05Nevada County, CACA101,91143.1+9%

06Siskiyou County, CACA42,01343.0+16%

07Mariposa County, CACA16,91842.9+9%

08Tuolumne County, CACA53,16042.9+15%

09Inyo County, CACA18,15842.8+10%

10Amador County, CACA41,87642.7+13%

11Lake County, CACA67,77242.7+5%

12Modoc County, CACA8,42641.8+12%

13Marin County, CACA253,69441.3+8%

14El Dorado County, CACA192,32339.4+11%

15Alpine County, CACA1,04339.3+17%

16Mendocino County, CACA88,12238.9+9%

17Shasta County, CACA181,64838.9+12%

18Napa County, CACA132,94938.3+5%

19Placer County, CACA442,08138.0+8%

20Tehama County, CACA64,66537.8+5%

21Sonoma County, CACA486,44437.5+8%

22San Luis Obispo County, CACA282,36737.3+12%

23San Mateo County, CACA743,56836.8+5%

24San Francisco County, CACA826,07936.5+1%

25Contra Costa County, CACA1,170,07036.4+6%

26Del Norte County, CACA26,41036.4+13%

27Humboldt County, CACA131,64736.3+9%

28Mono County, CACA12,50536.0+11%

29Butte County, CACA209,21135.8+5%

30Santa Cruz County, CACA258,85235.0+5%

31Lassen County, CACA28,11734.6+8%

32Alameda County, CACA1,636,63034.5+5%

33Ventura County, CACA830,85134.2+7%

34Sutter County, CACA98,78734.1+5%

35Santa Clara County, CACA1,914,39134.0+6%

36Solano County, CACA455,37633.9+9%

37Sacramento County, CACA1,618,46033.8+6%

38Glenn County, CACA28,14133.7+4%

39Santa Barbara County, CACA442,06533.4+5%

40Orange County, CACA3,149,50733.3+6%

41San Diego County, CACA3,282,24833.2+7%

42Riverside County, CACA2,544,91633.1+5%

43Madera County, CACA167,92732.7+2%

44Los Angeles County, CACA9,694,93432.0+4%

45San Joaquin County, CACA823,81531.9+3%

46Monterey County, CACA433,72931.7+6%

47Stanislaus County, CACA557,71931.7+3%

48Colusa County, CACA21,83631.5−2%

49San Benito County, CACA70,08231.4+2%

50Yuba County, CACA88,69131.4+6%

51Imperial County, CACA181,41131.0+8%

52Kern County, CACA927,06830.6+3%

53San Bernardino County, CACA2,224,09130.3+3%

54Kings County, CACA154,32730.2+6%

55Fresno County, CACA1,035,45629.9+1%

56Yolo County, CACA224,41029.5+2%

57Tulare County, CACA485,14629.2−1%

58Merced County, CACA297,26029.0+3%

SHOWING 1–58 OF 58

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