RANKING · 2020 CENSUS · 57 SHOWN OF 57

Largest Welsh population, California counties · 2020

California counties ranked by the number of residents who are Welsh ancestry, from the 2020 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 57 counties in California that qualify, ranked against each other statewide. The median across all 57 is 1,352.

Welsh Americans: full group profile →

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SAME RANKING BYCities States Metros

RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

RANKPLACESTATEPOPWELSH POPULATIONVS 2010

01Los Angeles County, CACA9,694,93424,149−15%

02San Diego County, CACA3,282,24816,964−16%

03Orange County, CACA3,149,50714,063−13%

04Riverside County, CACA2,544,9169,281−7%

05Sacramento County, CACA1,618,4608,342−11%

06Contra Costa County, CACA1,170,0706,500−6%

07Santa Clara County, CACA1,914,3916,165−25%

08San Bernardino County, CACA2,224,0915,893−28%

09Alameda County, CACA1,636,6305,559−12%

10Ventura County, CACA830,8514,431−13%

11Sonoma County, CACA486,4443,753−12%

12Kern County, CACA927,0683,537+4%

13San Francisco County, CACA826,0793,526−7%

14Placer County, CACA442,0813,297+22%

15San Mateo County, CACA743,5682,796−13%

16Fresno County, CACA1,035,4562,521−37%

17Santa Barbara County, CACA442,0652,512−27%

18San Luis Obispo County, CACA282,3672,345−14%

19Stanislaus County, CACA557,7192,308−19%

20Santa Cruz County, CACA258,8521,993−19%

21San Joaquin County, CACA823,8151,981−13%

22El Dorado County, CACA192,3231,978+1%

23Solano County, CACA455,3761,811−2%

24Marin County, CACA253,6941,738−25%

25Butte County, CACA209,2111,703−8%

26Humboldt County, CACA131,6471,540+43%

27Tulare County, CACA485,1461,420+18%

28Monterey County, CACA433,7291,376−35%

29Shasta County, CACA181,6481,352−21%

30Yolo County, CACA224,410900−36%

31Napa County, CACA132,949887−22%

32Merced County, CACA297,260867+66%

33Nevada County, CACA101,911805−45%

34Tuolumne County, CACA53,160761+77%

35Lake County, CACA67,772655−5%

36Mendocino County, CACA88,122650−39%

37Yuba County, CACA88,691596+29%

38Sutter County, CACA98,787587+28%

39Calaveras County, CACA46,605483−16%

40Madera County, CACA167,927469−39%

41Kings County, CACA154,327417−10%

42Tehama County, CACA64,665391+2%

43Amador County, CACA41,876349+42%

44Mono County, CACA12,505335+290%

45Siskiyou County, CACA42,013316−33%

46San Benito County, CACA70,082303+42%

47Lassen County, CACA28,117292+17%

48Inyo County, CACA18,158291+43%

49Plumas County, CACA18,583259+69%

50Imperial County, CACA181,411257−26%

51Del Norte County, CACA26,410250+108%

52Mariposa County, CACA16,918191+37%

53Trinity County, CACA15,720181−52%

54Glenn County, CACA28,14187−46%

55Sierra County, CACA3,09884–

56Modoc County, CACA8,42671−47%

57Colusa County, CACA21,83655+17%

SHOWING 1–57 OF 57

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