RANKING · 1990 CENSUS · 58 SHOWN OF 58

Most racially diverse, California counties · 1990

California counties ranked by the CensusEasy Diversity Score (0 to 100), the chance two random residents are of a different 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

RELATEDOldest by median age Youngest by median age Most foreign-born residents Highest uninsured rate Most women Most men

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPDIVERSITY SCOREVS 2000

01Los Angeles County, CACA9,694,93490+9%

02San Francisco County, CACA826,07985+3%

03Fresno County, CACA1,035,45685+10%

04Monterey County, CACA433,72984+15%

05Kings County, CACA154,32784+12%

06Alameda County, CACA1,636,63083−6%

07Tulare County, CACA485,14682+21%

08Merced County, CACA297,26082+10%

09Imperial County, CACA181,41181+58%

10San Benito County, CACA70,08279+20%

11Kern County, CACA927,06878+8%

12Madera County, CACA167,92777+12%

13Santa Clara County, CACA1,914,39177−6%

14Solano County, CACA455,37676−6%

15San Bernardino County, CACA2,224,09175−2%

16San Joaquin County, CACA823,81574−7%

17Colusa County, CACA21,83673+13%

18San Mateo County, CACA743,56872−8%

19Riverside County, CACA2,544,91671−1%

20Santa Barbara County, CACA442,06571+7%

21San Diego County, CACA3,282,24871−3%

22Yolo County, CACA224,41069+1%

23Ventura County, CACA830,85169+2%

24Orange County, CACA3,149,50768−10%

25Sutter County, CACA98,78765−3%

26Stanislaus County, CACA557,71965−2%

27Sacramento County, CACA1,618,46065−10%

28Contra Costa County, CACA1,170,07063−12%

29Yuba County, CACA88,69160+3%

30Santa Cruz County, CACA258,85259+2%

31Glenn County, CACA28,14157−5%

32Alpine County, CACA1,04356+129%

33Napa County, CACA132,94946−14%

34Del Norte County, CACA26,41046−1%

35San Luis Obispo County, CACA282,36744+0%

36Lassen County, CACA28,11744−13%

37Inyo County, CACA18,15843+29%

38Mendocino County, CACA88,12239−2%

39Sonoma County, CACA486,44439−15%

40Marin County, CACA253,69438−6%

41Tehama County, CACA64,66537−1%

42Mono County, CACA12,50537−10%

43Amador County, CACA41,87636+15%

44Tuolumne County, CACA53,16036+39%

45Butte County, CACA209,21135−1%

46Lake County, CACA67,77232−2%

47Modoc County, CACA8,42632+6%

48Placer County, CACA442,08130−3%

49Humboldt County, CACA131,64729+29%

50Siskiyou County, CACA42,01329+18%

51Mariposa County, CACA16,91827+22%

52El Dorado County, CACA192,32325−8%

53Trinity County, CACA15,72024+89%

54Sierra County, CACA3,09823+51%

55Plumas County, CACA18,58323+38%

56Shasta County, CACA181,64822+9%

57Calaveras County, CACA46,60521+4%

58Nevada County, CACA101,91117+3%

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)How this score is calculated

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