RANKING · 2024 ACS · 58 SHOWN OF 58

Largest Irish population, California counties

California counties ranked by the number of residents who are Irish ancestry, from the 2024 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 →

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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

RANKPLACESTATEPOPIRISH POPULATIONVS 2010

01Los Angeles County, CACA9,694,934370,162−13%

02San Diego County, CACA3,282,248255,722−10%

03Orange County, CACA3,149,507190,775−24%

04Riverside County, CACA2,544,916131,317−19%

05Sacramento County, CACA1,618,460108,971−19%

06San Bernardino County, CACA2,224,09197,191−30%

07Alameda County, CACA1,636,63089,627−7%

08Santa Clara County, CACA1,914,39185,120−18%

09Contra Costa County, CACA1,170,07084,598−16%

10Ventura County, CACA830,85165,367−14%

11San Francisco County, CACA826,07963,331−2%

12Sonoma County, CACA486,44459,215−9%

13San Mateo County, CACA743,56849,306−19%

14Fresno County, CACA1,035,45646,283−12%

15Placer County, CACA442,08146,252−12%

16Kern County, CACA927,06843,877−31%

17San Joaquin County, CACA823,81537,093−20%

18San Luis Obispo County, CACA282,36735,627+8%

19Marin County, CACA253,69434,173−9%

20Stanislaus County, CACA557,71933,219−27%

21Santa Barbara County, CACA442,06531,890−18%

22Solano County, CACA455,37628,459−16%

23Santa Cruz County, CACA258,85227,862−7%

24El Dorado County, CACA192,32324,585−7%

25Butte County, CACA209,21123,766−24%

26Monterey County, CACA433,72921,836−22%

27Shasta County, CACA181,64820,645−25%

28Tulare County, CACA485,14619,673−5%

29Yolo County, CACA224,41018,768+2%

30Humboldt County, CACA131,64715,869−11%

31Nevada County, CACA101,91113,878−22%

32Napa County, CACA132,94911,166−22%

33Merced County, CACA297,2609,662−25%

34Lake County, CACA67,7729,565−18%

35Tuolumne County, CACA53,1608,825−2%

36Mendocino County, CACA88,1228,654−26%

37Calaveras County, CACA46,6057,968+2%

38Madera County, CACA167,9277,961−23%

39Tehama County, CACA64,6657,038−25%

40Sutter County, CACA98,7876,532−28%

41Kings County, CACA154,3276,468−35%

42Amador County, CACA41,8766,032−15%

43Yuba County, CACA88,6915,612−31%

44Siskiyou County, CACA42,0135,413−19%

45San Benito County, CACA70,0824,325−7%

46Imperial County, CACA181,4113,134−31%

47Mariposa County, CACA16,9183,003−25%

48Del Norte County, CACA26,4102,936−33%

49Lassen County, CACA28,1172,487−51%

50Plumas County, CACA18,5831,892−40%

51Glenn County, CACA28,1411,644−36%

52Trinity County, CACA15,7201,480−53%

53Mono County, CACA12,5051,478−18%

54Inyo County, CACA18,1581,411−46%

55Colusa County, CACA21,8361,143−29%

56Modoc County, CACA8,426924−46%

57Sierra County, CACA3,098329−23%

58Alpine County, CACA1,043182+6%

SHOWING 1–58 OF 58

Download CSV (full list, 58 rows)

UPDATED 2026-08-08 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES