RANKING · 2024 ACS · 58 SHOWN OF 58

Least racially diverse, California counties

California counties with the lowest CensusEasy Diversity Score, where most residents share the same race or ethnicity (2024 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 71.

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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 1990

01Sierra County, CACA3,09831+74%

02Imperial County, CACA181,41132−48%

03Plumas County, CACA18,58341+99%

04Nevada County, CACA101,91142+170%

05Tuolumne County, CACA53,16046+52%

06Trinity County, CACA15,72047+113%

07Calaveras County, CACA46,60549+153%

08Shasta County, CACA181,64851+149%

09Modoc County, CACA8,42651+90%

10Mariposa County, CACA16,91853+116%

11Siskiyou County, CACA42,01354+95%

12El Dorado County, CACA192,32355+142%

13Amador County, CACA41,87655+63%

14Humboldt County, CACA131,64760+120%

15Tulare County, CACA485,14661−11%

16Mono County, CACA12,50563+77%

17Colusa County, CACA21,83664+1%

18San Luis Obispo County, CACA282,36765+62%

19Lake County, CACA67,77265+138%

20San Benito County, CACA70,08265−1%

21Butte County, CACA209,21166+121%

22Marin County, CACA253,69466+96%

23Placer County, CACA442,08166+151%

24Tehama County, CACA64,66567+122%

25Madera County, CACA167,92767+4%

26Merced County, CACA297,26067−9%

27Mendocino County, CACA88,12268+100%

28Monterey County, CACA433,72968−10%

29Lassen County, CACA28,11770+60%

30Sonoma County, CACA486,44471+109%

31Glenn County, CACA28,14171+41%

32Kings County, CACA154,32772−2%

33Del Norte County, CACA26,41072+57%

34Inyo County, CACA18,15872+78%

35Santa Cruz County, CACA258,85272+46%

36Alpine County, CACA1,04373+33%

37Kern County, CACA927,06873+12%

38Santa Barbara County, CACA442,06575+22%

39Stanislaus County, CACA557,71976+36%

40Fresno County, CACA1,035,45677+2%

41Ventura County, CACA830,85177+26%

42San Bernardino County, CACA2,224,09178+13%

43Napa County, CACA132,94978+93%

44Riverside County, CACA2,544,91679+24%

45Yuba County, CACA88,69181+50%

46Los Angeles County, CACA9,694,93484+1%

47San Diego County, CACA3,282,24885+31%

48Yolo County, CACA224,41086+43%

49Sutter County, CACA98,78786+54%

50Orange County, CACA3,149,50787+34%

51Santa Clara County, CACA1,914,39187+19%

52San Joaquin County, CACA823,81588+21%

53San Francisco County, CACA826,07989+6%

54San Mateo County, CACA743,56889+25%

55Sacramento County, CACA1,618,46091+49%

56Contra Costa County, CACA1,170,07091+51%

57Alameda County, CACA1,636,63094+16%

58Solano County, CACA455,37694+30%

SHOWING 1–58 OF 58

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES