RANKING · 2010 CENSUS · 58 SHOWN OF 58

Largest by population, California counties · 2010

The most populous California counties as of the 2010 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, CACA9,818,605+3%

02San Diego County, CACA3,095,313+10%

03Orange County, CACA3,010,232+6%

04Riverside County, CACA2,189,641+42%

05San Bernardino County, CACA2,035,210+19%

06Santa Clara County, CACA1,781,642+6%

07Alameda County, CACA1,510,271+5%

08Sacramento County, CACA1,418,788+16%

09Contra Costa County, CACA1,049,025+11%

10Fresno County, CACA930,450+16%

11Kern County, CACA839,631+27%

12Ventura County, CACA823,318+9%

13San Francisco County, CACA805,235+4%

14San Mateo County, CACA718,451+2%

15San Joaquin County, CACA685,306+22%

16Stanislaus County, CACA514,453+15%

17Sonoma County, CACA483,878+6%

18Tulare County, CACA442,179+20%

19Santa Barbara County, CACA423,895+6%

20Monterey County, CACA415,057+3%

21Solano County, CACA413,344+5%

22Placer County, CACA348,432+40%

23San Luis Obispo County, CACA269,637+9%

24Santa Cruz County, CACA262,382+3%

25Merced County, CACA255,793+21%

26Marin County, CACA252,409+2%

27Butte County, CACA220,000+8%

28Yolo County, CACA200,849+19%

29El Dorado County, CACA181,058+16%

30Shasta County, CACA177,223+9%

31Imperial County, CACA174,528+23%

32Kings County, CACA152,982+18%

33Madera County, CACA150,865+23%

34Napa County, CACA136,484+10%

35Humboldt County, CACA134,623+6%

36Nevada County, CACA98,764+7%

37Sutter County, CACA94,737+20%

38Mendocino County, CACA87,841+2%

39Yuba County, CACA72,155+20%

40Lake County, CACA64,665+11%

41Tehama County, CACA63,463+13%

42Tuolumne County, CACA55,365+2%

43San Benito County, CACA55,269+4%

44Calaveras County, CACA45,578+12%

45Siskiyou County, CACA44,900+1%

46Amador County, CACA38,091+9%

47Lassen County, CACA34,895+3%

48Del Norte County, CACA28,610+4%

49Glenn County, CACA28,122+6%

50Colusa County, CACA21,419+14%

51Plumas County, CACA20,007−4%

52Inyo County, CACA18,546+3%

53Mariposa County, CACA18,251+7%

54Mono County, CACA14,202+10%

55Trinity County, CACA13,786+6%

56Modoc County, CACA9,686+3%

57Sierra County, CACA3,240−9%

58Alpine County, CACA1,175−3%

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)

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