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 (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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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 –

01Nevada County, CACA101,91115–

02Sierra County, CACA3,09818–

03Calaveras County, CACA46,60519–

04Shasta County, CACA181,64821–

05Plumas County, CACA18,58321–

06Trinity County, CACA15,72022–

07El Dorado County, CACA192,32323–

08Mariposa County, CACA16,91824–

09Placer County, CACA442,08126–

10Modoc County, CACA8,42627–

11Humboldt County, CACA131,64727–

12Lake County, CACA67,77227–

13Siskiyou County, CACA42,01328–

14Butte County, CACA209,21130–

15Tehama County, CACA64,66530–

16Tuolumne County, CACA53,16030–

17Amador County, CACA41,87634–

18Marin County, CACA253,69434–

19Mendocino County, CACA88,12234–

20Sonoma County, CACA486,44434–

21Mono County, CACA12,50535–

22San Luis Obispo County, CACA282,36740–

23Napa County, CACA132,94940–

24Inyo County, CACA18,15841–

25Lassen County, CACA28,11744–

26Del Norte County, CACA26,41046–

27Santa Cruz County, CACA258,85250–

28Glenn County, CACA28,14150–

29Yuba County, CACA88,69154–

30Alpine County, CACA1,04355–

31Sutter County, CACA98,78756–

32Stanislaus County, CACA557,71956–

33Yolo County, CACA224,41060–

34Contra Costa County, CACA1,170,07060–

35Imperial County, CACA181,41161–

36Sacramento County, CACA1,618,46061–

37Santa Barbara County, CACA442,06561–

38Ventura County, CACA830,85161–

39Colusa County, CACA21,83663–

40Riverside County, CACA2,544,91664–

41Madera County, CACA167,92764–

42Orange County, CACA3,149,50765–

43San Diego County, CACA3,282,24865–

44Kern County, CACA927,06865–

45San Benito County, CACA70,08266–

46Tulare County, CACA485,14669–

47San Bernardino County, CACA2,224,09169–

48San Mateo County, CACA743,56872–

49Solano County, CACA455,37672–

50San Joaquin County, CACA823,81573–

51Santa Clara County, CACA1,914,39173–

52Kings County, CACA154,32774–

53Merced County, CACA297,26074–

54Monterey County, CACA433,72975–

55Fresno County, CACA1,035,45676–

56Alameda County, CACA1,636,63080–

57San Francisco County, CACA826,07984–

58Los Angeles County, CACA9,694,93484–

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