RANKING · 2000 CENSUS · 58 SHOWN OF 58

Most densely populated, California counties · 2000

California counties ranked by residents per square mile (2000). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 93.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 1990

01San Francisco County, CACA826,07916,632+7%

02Orange County, CACA3,149,5073,590+18%

03Los Angeles County, CACA9,694,9342,345+7%

04Alameda County, CACA1,636,6301,958+13%

05San Mateo County, CACA743,5681,576+9%

06Contra Costa County, CACA1,170,0701,324+18%

07Santa Clara County, CACA1,914,3911,303+12%

08Sacramento County, CACA1,618,4601,268+18%

09San Diego County, CACA3,282,248668+13%

10Santa Cruz County, CACA258,852574+11%

11Solano County, CACA455,376480+16%

12Marin County, CACA253,694475+7%

13Ventura County, CACA830,851409+13%

14San Joaquin County, CACA823,815405+17%

15Stanislaus County, CACA557,719299+21%

16Sonoma County, CACA486,444291+18%

17Riverside County, CACA2,544,916214+32%

18Placer County, CACA442,081177+44%

19Yolo County, CACA224,410166+20%

20Napa County, CACA132,949165+12%

21Santa Barbara County, CACA442,065146+8%

22Fresno County, CACA1,035,456134+20%

23Sutter County, CACA98,787131+23%

24Butte County, CACA209,211124+12%

25Monterey County, CACA433,729122+13%

26Merced County, CACA297,260109+18%

27Nevada County, CACA101,91196+17%

28Yuba County, CACA88,69195+3%

29Kings County, CACA154,32793+28%

30El Dorado County, CACA192,32392+24%

31San Bernardino County, CACA2,224,09185+21%

32Kern County, CACA927,06881+22%

33Tulare County, CACA485,14676+18%

34San Luis Obispo County, CACA282,36775+14%

35Amador County, CACA41,87659+17%

36Madera County, CACA167,92758+40%

37Lake County, CACA67,77246+15%

38Shasta County, CACA181,64843+11%

39Calaveras County, CACA46,60540+27%

40San Benito County, CACA70,08238+45%

41Humboldt County, CACA131,64735+6%

42Imperial County, CACA181,41134+30%

43Del Norte County, CACA26,41027+17%

44Mendocino County, CACA88,12225+7%

45Tuolumne County, CACA53,16025+12%

46Glenn County, CACA28,14120+7%

47Tehama County, CACA64,66519+13%

48Colusa County, CACA21,83616+16%

49Mariposa County, CACA16,91812+20%

50Plumas County, CACA18,5838+5%

51Lassen County, CACA28,1177+23%

52Siskiyou County, CACA42,0137+2%

53Mono County, CACA12,5054+29%

54Trinity County, CACA15,72040%

55Sierra County, CACA3,0984+7%

56Modoc County, CACA8,4262−2%

57Inyo County, CACA18,1582−2%

58Alpine County, CACA1,0432+9%

SHOWING 1–58 OF 58

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