RANKING · 2020 CENSUS · 58 SHOWN OF 58

Oldest housing stock, California counties · 2020

California counties ranked by oldest median year of construction (2020 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 1980.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2010 2020 2024

RANKPLACESTATEPOPMEDIAN YEAR BUILTVS 1990

01San Francisco County, CACA826,07919440%

02Los Angeles County, CACA9,694,93419630%

03San Mateo County, CACA743,56819650%

04Marin County, CACA253,69419660%

05Alameda County, CACA1,636,63019680%

06Humboldt County, CACA131,6471972+1%

07Inyo County, CACA18,15819720%

08Santa Cruz County, CACA258,85219730%

09Santa Barbara County, CACA442,06519730%

10Modoc County, CACA8,42619740%

11Monterey County, CACA433,72919740%

12Santa Clara County, CACA1,914,39119740%

13Sierra County, CACA3,09819740%

14Napa County, CACA132,94919750%

15Colusa County, CACA21,8361976+1%

16Glenn County, CACA28,1411976+1%

17Mendocino County, CACA88,12219760%

18Orange County, CACA3,149,50719760%

19Siskiyou County, CACA42,01319760%

20Ventura County, CACA830,85119760%

21Contra Costa County, CACA1,170,07019770%

22Lassen County, CACA28,11719780%

23Sonoma County, CACA486,44419780%

24Trinity County, CACA15,72019780%

25Butte County, CACA209,21119790%

26Fresno County, CACA1,035,45619790%

27Sacramento County, CACA1,618,46019790%

28San Diego County, CACA3,282,24819790%

29Tuolumne County, CACA53,16019790%

30Del Norte County, CACA26,41019800%

31Lake County, CACA67,77219800%

32Mono County, CACA12,50519800%

33Plumas County, CACA18,58319800%

34Stanislaus County, CACA557,71919800%

35Sutter County, CACA98,7871980+1%

36Tehama County, CACA64,66519800%

37Alpine County, CACA1,04319810%

38Merced County, CACA297,2601981+1%

39Shasta County, CACA181,64819810%

40Solano County, CACA455,37619810%

41Tulare County, CACA485,1461981+1%

42Amador County, CACA41,87619820%

43San Joaquin County, CACA823,8151982+1%

44San Luis Obispo County, CACA282,36719820%

45San Bernardino County, CACA2,224,09119820%

46Yolo County, CACA224,4101982+1%

47Yuba County, CACA88,6911982+1%

48El Dorado County, CACA192,32319830%

49Kern County, CACA927,0681983+1%

50Nevada County, CACA101,91119830%

51Kings County, CACA154,3271984+1%

52Mariposa County, CACA16,9181984+1%

53San Benito County, CACA70,0821985+1%

54Calaveras County, CACA46,6051987+1%

55Madera County, CACA167,9271987+1%

56Imperial County, CACA181,4111989+1%

57Riverside County, CACA2,544,9161989+1%

58Placer County, CACA442,0811992+1%

SHOWING 1–58 OF 58

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