RANKING · 2020 CENSUS · 58 SHOWN OF 58

Largest Irish population, California counties · 2020

California counties ranked by the number of residents who are Irish 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 58 counties in California that qualify, ranked against each other statewide.

Irish Americans: full group profile →

CaliforniaAll states All rankings

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

RANKPLACESTATEPOPIRISH POPULATIONVS 2010

01Los Angeles County, CACA9,694,934361,825−15%

02San Diego County, CACA3,282,248247,004−13%

03Orange County, CACA3,149,507201,599−19%

04Riverside County, CACA2,544,916137,036−15%

05San Bernardino County, CACA2,224,091111,748−19%

06Sacramento County, CACA1,618,460109,066−19%

07Alameda County, CACA1,636,63092,844−4%

08Contra Costa County, CACA1,170,07091,119−9%

09Santa Clara County, CACA1,914,39189,513−14%

10San Francisco County, CACA826,07967,092+4%

11Ventura County, CACA830,85164,898−14%

12Sonoma County, CACA486,44461,682−5%

13San Mateo County, CACA743,56854,618−10%

14Fresno County, CACA1,035,45647,118−11%

15Kern County, CACA927,06843,099−32%

16Placer County, CACA442,08142,357−20%

17San Joaquin County, CACA823,81541,872−9%

18San Luis Obispo County, CACA282,36734,215+4%

19Stanislaus County, CACA557,71933,732−26%

20Santa Barbara County, CACA442,06533,224−14%

21Marin County, CACA253,69432,432−13%

22Solano County, CACA455,37629,167−14%

23Santa Cruz County, CACA258,85228,267−6%

24Butte County, CACA209,21123,012−26%

25El Dorado County, CACA192,32320,788−21%

26Shasta County, CACA181,64820,205−26%

27Monterey County, CACA433,72919,668−29%

28Tulare County, CACA485,14617,423−16%

29Yolo County, CACA224,41016,818−9%

30Humboldt County, CACA131,64715,238−15%

31Nevada County, CACA101,91111,826−34%

32Napa County, CACA132,94911,586−19%

33Merced County, CACA297,26010,987−15%

34Madera County, CACA167,9279,688−6%

35Sutter County, CACA98,7879,319+3%

36Mendocino County, CACA88,1229,110−22%

37Tuolumne County, CACA53,1608,368−7%

38Calaveras County, CACA46,6057,346−6%

39Yuba County, CACA88,6917,202−11%

40Tehama County, CACA64,6657,058−24%

41Lake County, CACA67,7726,597−43%

42Kings County, CACA154,3275,975−40%

43Amador County, CACA41,8765,345−25%

44Siskiyou County, CACA42,0135,147−23%

45San Benito County, CACA70,0824,291−7%

46Imperial County, CACA181,4113,189−29%

47Mariposa County, CACA16,9182,938−27%

48Lassen County, CACA28,1172,751−45%

49Del Norte County, CACA26,4102,560−41%

50Mono County, CACA12,5051,871+4%

51Plumas County, CACA18,5831,830−42%

52Glenn County, CACA28,1411,746−32%

53Colusa County, CACA21,8361,700+6%

54Inyo County, CACA18,1581,626−38%

55Trinity County, CACA15,7201,398−56%

56Modoc County, CACA8,4261,132−34%

57Sierra County, CACA3,098332−22%

58Alpine County, CACA1,043117−32%

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS