RANKING · 2020 CENSUS · 58 SHOWN OF 58

Least racially diverse, California counties · 2020

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

01Sierra County, CACA3,09831+105%

02Imperial County, CACA181,41132−38%

03Nevada County, CACA101,91136+126%

04Plumas County, CACA18,58338+125%

05Calaveras County, CACA46,60543+114%

06Tuolumne County, CACA53,16045+74%

07Modoc County, CACA8,42645+52%

08Mariposa County, CACA16,91847+111%

09Shasta County, CACA181,64847+135%

10El Dorado County, CACA192,32350+83%

11Siskiyou County, CACA42,01352+111%

12Amador County, CACA41,87652+64%

13Humboldt County, CACA131,64758+157%

14Mono County, CACA12,50559+44%

15Trinity County, CACA15,72059+369%

16Placer County, CACA442,08161+98%

17Lake County, CACA67,77261+85%

18Tulare County, CACA485,14661−10%

19Butte County, CACA209,21162+77%

20San Luis Obispo County, CACA282,36762+40%

21Tehama County, CACA64,66562+67%

22Colusa County, CACA21,83663−2%

23Marin County, CACA253,69464+56%

24Alpine County, CACA1,04365+167%

25San Benito County, CACA70,08265−2%

26Mendocino County, CACA88,12266+65%

27Madera County, CACA167,92767−3%

28Merced County, CACA297,26068−9%

29Monterey County, CACA433,72968−6%

30Lassen County, CACA28,11769+37%

31Sonoma County, CACA486,44469+51%

32Glenn County, CACA28,14169+16%

33Inyo County, CACA18,15871+114%

34Santa Cruz County, CACA258,85271+23%

35Del Norte County, CACA26,41072+54%

36Kings County, CACA154,32772−4%

37Kern County, CACA927,06874+2%

38Santa Barbara County, CACA442,06574+12%

39Stanislaus County, CACA557,71976+15%

40Napa County, CACA132,94976+42%

41Ventura County, CACA830,85177+14%

42Fresno County, CACA1,035,45677+0%

43San Bernardino County, CACA2,224,09178+1%

44Yuba County, CACA88,69178+35%

45Riverside County, CACA2,544,91679+9%

46San Diego County, CACA3,282,24884+15%

47Los Angeles County, CACA9,694,93484+1%

48Yolo County, CACA224,41084+23%

49Sutter County, CACA98,78785+28%

50Orange County, CACA3,149,50786+14%

51Santa Clara County, CACA1,914,39187+6%

52San Francisco County, CACA826,07988+6%

53San Joaquin County, CACA823,81588+12%

54San Mateo County, CACA743,56889+13%

55Sacramento County, CACA1,618,46090+26%

56Contra Costa County, CACA1,170,07091+26%

57Alameda County, CACA1,636,63093+6%

58Solano County, CACA455,37694+16%

SHOWING 1–58 OF 58

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