RANKING · 2020 CENSUS · 58 SHOWN OF 58

Largest by population, California counties · 2020

The most populous California counties as of the 2020 population estimates. This list covers the 58 counties in California that qualify, ranked against each other statewide.

CaliforniaAll states All rankings

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, CACA10,014,009+5%

02San Diego County, CACA3,298,634+17%

03Orange County, CACA3,186,989+12%

04Riverside County, CACA2,418,185+56%

05San Bernardino County, CACA2,181,654+28%

06Santa Clara County, CACA1,936,259+15%

07Alameda County, CACA1,682,353+17%

08Sacramento County, CACA1,585,055+30%

09Contra Costa County, CACA1,165,927+23%

10Fresno County, CACA1,008,654+26%

11Kern County, CACA909,235+37%

12San Francisco County, CACA873,965+13%

13Ventura County, CACA843,843+12%

14San Joaquin County, CACA779,233+38%

15San Mateo County, CACA764,442+8%

16Stanislaus County, CACA552,878+24%

17Sonoma County, CACA488,863+7%

18Tulare County, CACA473,117+29%

19Solano County, CACA453,491+15%

20Santa Barbara County, CACA448,229+12%

21Monterey County, CACA439,035+9%

22Placer County, CACA404,739+63%

23San Luis Obispo County, CACA282,424+14%

24Merced County, CACA281,202+34%

25Santa Cruz County, CACA270,861+6%

26Marin County, CACA262,321+6%

27Yolo County, CACA216,403+28%

28Butte County, CACA211,632+4%

29El Dorado County, CACA191,185+22%

30Shasta County, CACA182,155+12%

31Imperial County, CACA179,702+26%

32Madera County, CACA156,255+27%

33Kings County, CACA152,486+18%

34Napa County, CACA138,019+11%

35Humboldt County, CACA136,463+8%

36Nevada County, CACA102,241+11%

37Sutter County, CACA99,633+26%

38Mendocino County, CACA91,601+6%

39Yuba County, CACA81,575+35%

40Lake County, CACA68,163+17%

41Tehama County, CACA65,829+17%

42San Benito County, CACA64,209+21%

43Tuolumne County, CACA55,620+2%

44Calaveras County, CACA45,292+12%

45Siskiyou County, CACA44,076−1%

46Amador County, CACA40,474+15%

47Lassen County, CACA32,730−3%

48Glenn County, CACA28,917+9%

49Del Norte County, CACA27,743+1%

50Colusa County, CACA21,839+16%

51Plumas County, CACA19,790−5%

52Inyo County, CACA19,016+6%

53Mariposa County, CACA17,131+0%

54Trinity County, CACA16,112+24%

55Mono County, CACA13,195+3%

56Modoc County, CACA8,700−8%

57Sierra County, CACA3,236−9%

58Alpine County, CACA1,204−0%

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)

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