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. The median across all 58 is 18,768. Biggest climber in the top 100 since 2020: Lake County, CA, up 7 places to #34.

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SAME RANKING BYCities States Metros

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%

05▲1Sacramento County, CACA1,618,460108,971−19%

06▼1San Bernardino County, CACA2,224,09197,191−30%

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

08▲1Santa Clara County, CACA1,914,39185,120−18%

09▼1Contra Costa County, CACA1,170,07084,598−16%

10▲1Ventura County, CACA830,85165,367−14%

11▼1San 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%

15▲1Placer County, CACA442,08146,252−12%

16▼1Kern County, CACA927,06843,877−31%

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

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

19▲2Marin County, CACA253,69434,173−9%

20▼1Stanislaus County, CACA557,71933,219−27%

21▼1Santa Barbara County, CACA442,06531,890−18%

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

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

24▲1El Dorado County, CACA192,32324,585−7%

25▼1Butte County, CACA209,21123,766−24%

26▲1Monterey County, CACA433,72921,836−22%

27▼1Shasta 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%

34▲7Lake County, CACA67,7729,565−18%

35▲2Tuolumne County, CACA53,1608,825−2%

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

37▲1Calaveras County, CACA46,6057,968+2%

38▼4Madera County, CACA167,9277,961−23%

39▲1Tehama County, CACA64,6657,038−25%

40▼5Sutter County, CACA98,7876,532−28%

41▲1Kings County, CACA154,3276,468−35%

42▲1Amador County, CACA41,8766,032−15%

43▼4Yuba 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%

48▲1Del Norte County, CACA26,4102,936−33%

49▼1Lassen County, CACA28,1172,487−51%

50▲1Plumas County, CACA18,5831,892−40%

51▲1Glenn County, CACA28,1411,644−36%

52▲3Trinity County, CACA15,7201,480−53%

53▼3Mono County, CACA12,5051,478−18%

54Inyo County, CACA18,1581,411−46%

55▼2Colusa 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 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES