RANKING · 2024 ACS · 58 SHOWN OF 58

Highest Irish population share, California counties

California counties ranked by the share of all residents who are Irish ancestry (2023 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.

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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 2000

01Mariposa County, CACA16,91817.6%–

02Calaveras County, CACA46,60517.2%–

03Tuolumne County, CACA53,16016.2%–

04Amador County, CACA41,87614.6%–

05Lake County, CACA67,77214.0%–

06Nevada County, CACA101,91113.5%–

07Marin County, CACA253,69413.2%–

08El Dorado County, CACA192,32312.8%–

09San Luis Obispo County, CACA282,36712.7%–

10Siskiyou County, CACA42,01312.5%–

11Sonoma County, CACA486,44412.2%–

12Sierra County, CACA3,09812.0%–

13Humboldt County, CACA131,64711.8%–

14Butte County, CACA209,21111.4%–

15Shasta County, CACA181,64811.4%–

16Alpine County, CACA1,04311.3%–

17Mono County, CACA12,50511.2%–

18Placer County, CACA442,08111.0%–

19Del Norte County, CACA26,41010.8%–

20Tehama County, CACA64,66510.8%–

21Modoc County, CACA8,42610.7%–

22Santa Cruz County, CACA258,85210.5%–

23Plumas County, CACA18,5839.7%–

24Mendocino County, CACA88,1229.6%–

25Trinity County, CACA15,7209.3%–

26Yolo County, CACA224,4108.5%–

27Napa County, CACA132,9498.3%–

28Lassen County, CACA28,1178.2%–

29Ventura County, CACA830,8517.8%–

30San Diego County, CACA3,282,2487.8%–

31San Francisco County, CACA826,0797.6%–

32Inyo County, CACA18,1587.5%–

33Contra Costa County, CACA1,170,0707.3%–

34Santa Barbara County, CACA442,0657.2%–

35Sacramento County, CACA1,618,4606.8%–

36San Mateo County, CACA743,5686.6%–

37Yuba County, CACA88,6916.6%–

38Sutter County, CACA98,7876.6%–

39San Benito County, CACA70,0826.4%–

40Solano County, CACA455,3766.3%–

41Orange County, CACA3,149,5076.0%–

42Stanislaus County, CACA557,7196.0%–

43Glenn County, CACA28,1415.8%–

44Alameda County, CACA1,636,6305.4%–

45Riverside County, CACA2,544,9165.3%–

46Colusa County, CACA21,8365.2%–

47Monterey County, CACA433,7295.0%–

48Madera County, CACA167,9274.9%–

49Kern County, CACA927,0684.8%–

50San Joaquin County, CACA823,8154.7%–

51Fresno County, CACA1,035,4564.6%–

52Santa Clara County, CACA1,914,3914.5%–

53San Bernardino County, CACA2,224,0914.4%–

54Kings County, CACA154,3274.2%–

55Tulare County, CACA485,1464.1%–

56Los Angeles County, CACA9,694,9343.8%–

57Merced County, CACA297,2603.3%–

58Imperial County, CACA181,4111.7%–

SHOWING 1–58 OF 58

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UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES