RANKING · 2025 ESTIMATES · 58 SHOWN OF 58

Largest by population, California counties

The most populous California counties as of the 2025 population estimates. 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

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Los Angeles County, CACA9,694,934+2%

02San Diego County, CACA3,282,248+17%

03Orange County, CACA3,149,507+11%

04Riverside County, CACA2,544,916+65%

05San Bernardino County, CACA2,224,091+30%

06Santa Clara County, CACA1,914,391+14%

07Alameda County, CACA1,636,630+13%

08Sacramento County, CACA1,618,460+32%

09Contra Costa County, CACA1,170,070+23%

10Fresno County, CACA1,035,456+30%

11Kern County, CACA927,068+40%

12Ventura County, CACA830,851+10%

13San Francisco County, CACA826,079+6%

14San Joaquin County, CACA823,815+46%

15San Mateo County, CACA743,568+5%

16Stanislaus County, CACA557,719+25%

17Sonoma County, CACA486,444+6%

18Tulare County, CACA485,146+32%

19Solano County, CACA455,376+15%

20Placer County, CACA442,081+78%

21Santa Barbara County, CACA442,065+11%

22Monterey County, CACA433,729+8%

23Merced County, CACA297,260+41%

24San Luis Obispo County, CACA282,367+14%

25Santa Cruz County, CACA258,852+1%

26Marin County, CACA253,694+3%

27Yolo County, CACA224,410+33%

28Butte County, CACA209,211+3%

29El Dorado County, CACA192,323+23%

30Shasta County, CACA181,648+11%

31Imperial County, CACA181,411+27%

32Madera County, CACA167,927+36%

33Kings County, CACA154,327+19%

34Napa County, CACA132,949+7%

35Humboldt County, CACA131,647+4%

36Nevada County, CACA101,911+11%

37Sutter County, CACA98,787+25%

38Yuba County, CACA88,691+47%

39Mendocino County, CACA88,122+2%

40San Benito County, CACA70,082+32%

41Lake County, CACA67,772+16%

42Tehama County, CACA64,665+15%

43Tuolumne County, CACA53,160−2%

44Calaveras County, CACA46,605+15%

45Siskiyou County, CACA42,013−5%

46Amador County, CACA41,876+19%

47Glenn County, CACA28,141+6%

48Lassen County, CACA28,117−17%

49Del Norte County, CACA26,410−4%

50Colusa County, CACA21,836+16%

51Plumas County, CACA18,583−11%

52Inyo County, CACA18,158+1%

53Mariposa County, CACA16,918−1%

54Trinity County, CACA15,720+21%

55Mono County, CACA12,505−3%

56Modoc County, CACA8,426−11%

57Sierra County, CACA3,098−13%

58Alpine County, CACA1,043−14%

SHOWING 1–58 OF 58

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES