RANKING · 2020 CENSUS · 58 SHOWN OF 58

Largest senior population, California counties · 2020

California counties home to the most residents aged 65 and over as of 2020. Ranked by number of people, not the senior share. This list covers the 58 counties in California that qualify, ranked against each other statewide.

CaliforniaAll states All rankings

SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPRESIDENTS 65 AND OVERVS 2000

01Los Angeles County, CACA9,694,9341,453,950+57%

02Orange County, CACA3,149,507501,104+78%

03San Diego County, CACA3,282,248499,874+59%

04Riverside County, CACA2,544,916370,792+89%

05San Bernardino County, CACA2,224,091277,924+90%

06Santa Clara County, CACA1,914,391267,535+67%

07Alameda County, CACA1,636,630240,483+63%

08Sacramento County, CACA1,618,460237,649+75%

09Contra Costa County, CACA1,170,070192,799+80%

10Ventura County, CACA830,851142,526+86%

11San Francisco County, CACA826,079142,099+34%

12Fresno County, CACA1,035,456133,322+68%

13San Mateo County, CACA743,568126,316+43%

14Kern County, CACA927,068107,188+73%

15San Joaquin County, CACA823,815106,606+78%

16Sonoma County, CACA486,444102,022+76%

17Placer County, CACA442,08182,923+155%

18Stanislaus County, CACA557,71978,433+68%

19Solano County, CACA455,37675,040+101%

20Santa Barbara County, CACA442,06574,701+47%

21Monterey County, CACA433,72962,416+55%

22San Luis Obispo County, CACA282,36761,253+72%

23Marin County, CACA253,69459,247+77%

24Tulare County, CACA485,14657,838+61%

25Santa Cruz County, CACA258,85249,193+93%

26El Dorado County, CACA192,32342,658+121%

27Shasta County, CACA181,64840,779+64%

28Butte County, CACA209,21140,155+25%

29Merced County, CACA297,26033,481+67%

30Yolo County, CACA224,41030,209+91%

31Napa County, CACA132,94928,688+50%

32Nevada County, CACA101,91128,559+78%

33Humboldt County, CACA131,64726,122+66%

34Imperial County, CACA181,41124,493+71%

35Madera County, CACA167,92722,959+69%

36Mendocino County, CACA88,12221,176+81%

37Kings County, CACA154,32716,146+69%

38Sutter County, CACA98,78715,951+64%

39Lake County, CACA67,77215,444+36%

40Tuolumne County, CACA53,16015,053+50%

41Tehama County, CACA64,66513,165+48%

42Calaveras County, CACA46,60512,762+73%

43Siskiyou County, CACA42,01311,790+47%

44Amador County, CACA41,87611,480+81%

45Yuba County, CACA88,69110,915+70%

46San Benito County, CACA70,0828,764+103%

47Plumas County, CACA18,5835,902+58%

48Del Norte County, CACA26,4105,241+52%

49Glenn County, CACA28,1414,975+45%

50Mariposa County, CACA16,9184,800+63%

51Lassen County, CACA28,1174,745+55%

52Inyo County, CACA18,1584,512+32%

53Trinity County, CACA15,7204,006+79%

54Colusa County, CACA21,8363,251+52%

55Modoc County, CACA8,4262,320+40%

56Mono County, CACA12,5052,128+118%

57Sierra County, CACA3,0981,001+59%

58Alpine County, CACA1,043301+151%

SHOWING 1–58 OF 58

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