RANKING · 2010 CENSUS · 58 SHOWN OF 58

Largest Irish population, California counties · 2010

California counties ranked by the number of residents who are Irish ancestry, from the 2010 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 18,488.

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 –

01Los Angeles County, CACA9,694,934424,072–

02San Diego County, CACA3,282,248282,766–

03Orange County, CACA3,149,507250,388–

04Riverside County, CACA2,544,916161,809–

05San Bernardino County, CACA2,224,091138,700–

06Sacramento County, CACA1,618,460134,151–

07Santa Clara County, CACA1,914,391104,278–

08Contra Costa County, CACA1,170,070100,252–

09Alameda County, CACA1,636,63096,625–

10Ventura County, CACA830,85175,690–

11Sonoma County, CACA486,44464,914–

12San Francisco County, CACA826,07964,487–

13Kern County, CACA927,06863,538–

14San Mateo County, CACA743,56860,636–

15Fresno County, CACA1,035,45652,878–

16Placer County, CACA442,08152,745–

17San Joaquin County, CACA823,81546,260–

18Stanislaus County, CACA557,71945,309–

19Santa Barbara County, CACA442,06538,755–

20Marin County, CACA253,69437,352–

21Solano County, CACA455,37634,048–

22San Luis Obispo County, CACA282,36732,940–

23Butte County, CACA209,21131,158–

24Santa Cruz County, CACA258,85229,996–

25Monterey County, CACA433,72927,887–

26Shasta County, CACA181,64827,365–

27El Dorado County, CACA192,32326,470–

28Tulare County, CACA485,14620,686–

29Yolo County, CACA224,41018,488–

30Nevada County, CACA101,91117,905–

31Humboldt County, CACA131,64717,875–

32Napa County, CACA132,94914,289–

33Merced County, CACA297,26012,914–

34Mendocino County, CACA88,12211,641–

35Lake County, CACA67,77211,631–

36Madera County, CACA167,92710,333–

37Kings County, CACA154,32710,001–

38Tehama County, CACA64,6659,322–

39Sutter County, CACA98,7879,065–

40Tuolumne County, CACA53,1608,997–

41Yuba County, CACA88,6918,135–

42Calaveras County, CACA46,6057,843–

43Amador County, CACA41,8767,114–

44Siskiyou County, CACA42,0136,696–

45Lassen County, CACA28,1175,039–

46San Benito County, CACA70,0824,634–

47Imperial County, CACA181,4114,518–

48Del Norte County, CACA26,4104,362–

49Mariposa County, CACA16,9183,998–

50Trinity County, CACA15,7203,143–

51Plumas County, CACA18,5833,133–

52Inyo County, CACA18,1582,623–

53Glenn County, CACA28,1412,586–

54Mono County, CACA12,5051,792–

55Modoc County, CACA8,4261,725–

56Colusa County, CACA21,8361,600–

57Sierra County, CACA3,098427–

58Alpine County, CACA1,043171–

SHOWING 1–58 OF 58

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