RANKING · 2000 CENSUS · 58 SHOWN OF 58

Least racially diverse, California counties · 2000

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

01Trinity County, CACA15,72013+0%

02Sierra County, CACA3,09815+0%

03Nevada County, CACA101,91116+0%

04Plumas County, CACA18,58317+0%

05Shasta County, CACA181,64820+0%

06Calaveras County, CACA46,60520+0%

07Mariposa County, CACA16,91822+0%

08Humboldt County, CACA131,64723+0%

09Alpine County, CACA1,04324+0%

10Siskiyou County, CACA42,01325+0%

11Tuolumne County, CACA53,16026+0%

12El Dorado County, CACA192,32328+0%

13Modoc County, CACA8,42630+0%

14Placer County, CACA442,08131+0%

15Amador County, CACA41,87632+0%

16Lake County, CACA67,77233+0%

17Inyo County, CACA18,15833+0%

18Butte County, CACA209,21135+0%

19Tehama County, CACA64,66537+0%

20Mendocino County, CACA88,12240+0%

21Mono County, CACA12,50541+0%

22Marin County, CACA253,69441+0%

23San Luis Obispo County, CACA282,36744+0%

24Sonoma County, CACA486,44446+0%

25Del Norte County, CACA26,41047+0%

26Lassen County, CACA28,11751+0%

27Imperial County, CACA181,41151+0%

28Napa County, CACA132,94954+0%

29Santa Cruz County, CACA258,85258+0%

30Yuba County, CACA88,69158+0%

31Glenn County, CACA28,14160+0%

32Colusa County, CACA21,83665+0%

33Stanislaus County, CACA557,71966+0%

34San Benito County, CACA70,08266+0%

35Santa Barbara County, CACA442,06566+0%

36Sutter County, CACA98,78767+0%

37Ventura County, CACA830,85167+0%

38Tulare County, CACA485,14667+0%

39Yolo County, CACA224,41068+0%

40Madera County, CACA167,92769+0%

41Sacramento County, CACA1,618,46071+0%

42Contra Costa County, CACA1,170,07072+0%

43Kern County, CACA927,06872+0%

44Riverside County, CACA2,544,91672+0%

45San Diego County, CACA3,282,24873+0%

46Monterey County, CACA433,72973+0%

47Merced County, CACA297,26074+0%

48Kings County, CACA154,32775+0%

49Orange County, CACA3,149,50775+0%

50Fresno County, CACA1,035,45677+0%

51San Bernardino County, CACA2,224,09177+0%

52San Mateo County, CACA743,56878+0%

53San Joaquin County, CACA823,81579+0%

54Solano County, CACA455,37681+0%

55Santa Clara County, CACA1,914,39182+0%

56Los Angeles County, CACA9,694,93483+0%

57San Francisco County, CACA826,07983+0%

58Alameda County, CACA1,636,63088+0%

SHOWING 1–58 OF 58

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