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.

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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 1990

01Calaveras County, CACA46,60544.6+12%

02Trinity County, CACA15,72044.6+18%

03Plumas County, CACA18,58344.2+13%

04Sierra County, CACA3,09843.7−0%

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