RANKING · 2010 CENSUS · 58 SHOWN OF 58

Highest Irish population share, California counties · 2010

California counties ranked by the share of all residents who are Irish ancestry (2010 American Community Survey). A concentration measure: Irish residents as a percentage of total population. This list covers the 58 counties in California that qualify, ranked against each other statewide. The median across all 58 is 10.7%.

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 SHAREVS –

01Trinity County, CACA15,72022.9%–

02Mariposa County, CACA16,91821.9%–

03Amador County, CACA41,87618.6%–

04Nevada County, CACA101,91118.2%–

05Lake County, CACA67,77218.1%–

06Modoc County, CACA8,42618.0%–

07Calaveras County, CACA46,60517.1%–

08Tuolumne County, CACA53,16016.0%–

09Placer County, CACA442,08115.7%–

10Shasta County, CACA181,64815.5%–

11Plumas County, CACA18,58315.4%–

12Del Norte County, CACA26,41015.3%–

13Marin County, CACA253,69415.0%–

14Siskiyou County, CACA42,01315.0%–

15Tehama County, CACA64,66514.9%–

16El Dorado County, CACA192,32314.8%–

17Alpine County, CACA1,04314.5%–

18Lassen County, CACA28,11714.4%–

19Butte County, CACA209,21114.3%–

20Inyo County, CACA18,15814.2%–

21Sonoma County, CACA486,44413.7%–

22Humboldt County, CACA131,64713.4%–

23Mendocino County, CACA88,12213.3%–

24Mono County, CACA12,50512.9%–

25Sierra County, CACA3,09812.7%–

26San Luis Obispo County, CACA282,36712.4%–

27Santa Cruz County, CACA258,85211.7%–

28Yuba County, CACA88,69111.4%–

29Napa County, CACA132,94910.7%–

30Contra Costa County, CACA1,170,0709.8%–

31Sutter County, CACA98,7879.7%–

32Sacramento County, CACA1,618,4609.6%–

33Yolo County, CACA224,4109.4%–

34San Diego County, CACA3,282,2489.4%–

35Ventura County, CACA830,8519.4%–

36Santa Barbara County, CACA442,0659.3%–

37Glenn County, CACA28,1419.3%–

38Stanislaus County, CACA557,7198.9%–

39San Mateo County, CACA743,5688.6%–

40San Benito County, CACA70,0828.5%–

41Orange County, CACA3,149,5078.4%–

42Solano County, CACA455,3768.3%–

43San Francisco County, CACA826,0798.2%–

44Kern County, CACA927,0687.8%–

45Riverside County, CACA2,544,9167.7%–

46Colusa County, CACA21,8367.6%–

47Madera County, CACA167,9277.0%–

48San Bernardino County, CACA2,224,0916.9%–

49San Joaquin County, CACA823,8156.9%–

50Monterey County, CACA433,7296.8%–

51Kings County, CACA154,3276.6%–

52Alameda County, CACA1,636,6306.5%–

53Santa Clara County, CACA1,914,3916.0%–

54Fresno County, CACA1,035,4565.8%–

55Merced County, CACA297,2605.2%–

56Tulare County, CACA485,1464.8%–

57Los Angeles County, CACA9,694,9344.3%–

58Imperial County, CACA181,4112.7%–

SHOWING 1–58 OF 58

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