RANKING · 1990 CENSUS · 58 SHOWN OF 58

Least racially diverse, California counties · 1990

California counties with the lowest CensusEasy Diversity Score, where most residents share the same race or ethnicity (2023 ACS). 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

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPDIVERSITY SCOREVS 2000

01Nevada County, CACA101,91117+3%

02Calaveras County, CACA46,60521+4%

03Shasta County, CACA181,64822+9%

04Plumas County, CACA18,58323+38%

05Sierra County, CACA3,09823+51%

06Trinity County, CACA15,72024+89%

07El Dorado County, CACA192,32325−8%

08Mariposa County, CACA16,91827+22%

09Siskiyou County, CACA42,01329+18%

10Humboldt County, CACA131,64729+29%

11Placer County, CACA442,08130−3%

12Modoc County, CACA8,42632+6%

13Lake County, CACA67,77232−2%

14Butte County, CACA209,21135−1%

15Tuolumne County, CACA53,16036+39%

16Amador County, CACA41,87636+15%

17Mono County, CACA12,50537−10%

18Tehama County, CACA64,66537−1%

19Marin County, CACA253,69438−6%

20Sonoma County, CACA486,44439−15%

21Mendocino County, CACA88,12239−2%

22Inyo County, CACA18,15843+29%

23Lassen County, CACA28,11744−13%

24San Luis Obispo County, CACA282,36744+0%

25Del Norte County, CACA26,41046−1%

26Napa County, CACA132,94946−14%

27Alpine County, CACA1,04356+129%

28Glenn County, CACA28,14157−5%

29Santa Cruz County, CACA258,85259+2%

30Yuba County, CACA88,69160+3%

31Contra Costa County, CACA1,170,07063−12%

32Sacramento County, CACA1,618,46065−10%

33Stanislaus County, CACA557,71965−2%

34Sutter County, CACA98,78765−3%

35Orange County, CACA3,149,50768−10%

36Ventura County, CACA830,85169+2%

37Yolo County, CACA224,41069+1%

38San Diego County, CACA3,282,24871−3%

39Santa Barbara County, CACA442,06571+7%

40Riverside County, CACA2,544,91671−1%

41San Mateo County, CACA743,56872−8%

42Colusa County, CACA21,83673+13%

43San Joaquin County, CACA823,81574−7%

44San Bernardino County, CACA2,224,09175−2%

45Solano County, CACA455,37676−6%

46Santa Clara County, CACA1,914,39177−6%

47Madera County, CACA167,92777+12%

48Kern County, CACA927,06878+8%

49San Benito County, CACA70,08279+20%

50Imperial County, CACA181,41181+58%

51Merced County, CACA297,26082+10%

52Tulare County, CACA485,14682+21%

53Alameda County, CACA1,636,63083−6%

54Kings County, CACA154,32784+12%

55Monterey County, CACA433,72984+15%

56Fresno County, CACA1,035,45685+10%

57San Francisco County, CACA826,07985+3%

58Los Angeles County, CACA9,694,93490+9%

SHOWING 1–58 OF 58

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES