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 (1990 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 55.

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CaliforniaAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

RANKPLACESTATEPOPDIVERSITY SCOREVS –

01Los Angeles County, CACA9,694,93484–

02San Francisco County, CACA826,07984–

03Alameda County, CACA1,636,63080–

04Fresno County, CACA1,035,45676–

05Monterey County, CACA433,72975–

06Merced County, CACA297,26074–

07Kings County, CACA154,32774–

08Santa Clara County, CACA1,914,39173–

09San Joaquin County, CACA823,81573–

10Solano County, CACA455,37672–

11San Mateo County, CACA743,56872–

12San Bernardino County, CACA2,224,09169–

13Tulare County, CACA485,14669–

14San Benito County, CACA70,08266–

15Kern County, CACA927,06865–

16San Diego County, CACA3,282,24865–

17Orange County, CACA3,149,50765–

18Madera County, CACA167,92764–

19Riverside County, CACA2,544,91664–

20Colusa County, CACA21,83663–

21Ventura County, CACA830,85161–

22Santa Barbara County, CACA442,06561–

23Sacramento County, CACA1,618,46061–

24Imperial County, CACA181,41161–

25Contra Costa County, CACA1,170,07060–

26Yolo County, CACA224,41060–

27Stanislaus County, CACA557,71956–

28Sutter County, CACA98,78756–

29Alpine County, CACA1,04355–

30Yuba County, CACA88,69154–

31Glenn County, CACA28,14150–

32Santa Cruz County, CACA258,85250–

33Del Norte County, CACA26,41046–

34Lassen County, CACA28,11744–

35Inyo County, CACA18,15841–

36Napa County, CACA132,94940–

37San Luis Obispo County, CACA282,36740–

38Mono County, CACA12,50535–

39Sonoma County, CACA486,44434–

40Mendocino County, CACA88,12234–

41Marin County, CACA253,69434–

42Amador County, CACA41,87634–

43Tuolumne County, CACA53,16030–

44Tehama County, CACA64,66530–

45Butte County, CACA209,21130–

46Siskiyou County, CACA42,01328–

47Lake County, CACA67,77227–

48Humboldt County, CACA131,64727–

49Modoc County, CACA8,42627–

50Placer County, CACA442,08126–

51Mariposa County, CACA16,91824–

52El Dorado County, CACA192,32323–

53Trinity County, CACA15,72022–

54Plumas County, CACA18,58321–

55Shasta County, CACA181,64821–

56Calaveras County, CACA46,60519–

57Sierra County, CACA3,09818–

58Nevada County, CACA101,91115–

SHOWING 1–58 OF 58

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

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