RANKING · 2020 CENSUS · 58 SHOWN OF 58

Highest Irish population share, California counties · 2020

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, CACA16,91817.0%–

02Calaveras County, CACA46,60516.0%–

03Tuolumne County, CACA53,16015.5%–

04Amador County, CACA41,87613.7%–

05Mono County, CACA12,50513.0%–

06Modoc County, CACA8,42612.8%–

07Marin County, CACA253,69412.5%–

08Sonoma County, CACA486,44412.4%–

09San Luis Obispo County, CACA282,36712.1%–

10Nevada County, CACA101,91111.9%–

11Siskiyou County, CACA42,01311.8%–

12Sierra County, CACA3,09811.5%–

13Shasta County, CACA181,64811.3%–

14Humboldt County, CACA131,64711.2%–

15Trinity County, CACA15,72011.1%–

16Tehama County, CACA64,66511.0%–

17El Dorado County, CACA192,32310.9%–

18Placer County, CACA442,08110.8%–

19Mendocino County, CACA88,12210.5%–

20Santa Cruz County, CACA258,85210.3%–

21Butte County, CACA209,21110.3%–

22Lake County, CACA67,77210.3%–

23Alpine County, CACA1,04310.1%–

24Plumas County, CACA18,5839.7%–

25Sutter County, CACA98,7879.7%–

26Yuba County, CACA88,6919.3%–

27Del Norte County, CACA26,4109.2%–

28Inyo County, CACA18,1589.1%–

29Lassen County, CACA28,1179.0%–

30Napa County, CACA132,9498.4%–

31Contra Costa County, CACA1,170,0707.9%–

32Colusa County, CACA21,8367.9%–

33Yolo County, CACA224,4107.7%–

34Ventura County, CACA830,8517.7%–

35San Francisco County, CACA826,0797.7%–

36Santa Barbara County, CACA442,0657.5%–

37San Diego County, CACA3,282,2487.4%–

38San Mateo County, CACA743,5687.1%–

39Sacramento County, CACA1,618,4607.1%–

40San Benito County, CACA70,0827.0%–

41Solano County, CACA455,3766.6%–

42Orange County, CACA3,149,5076.4%–

43Glenn County, CACA28,1416.2%–

44Madera County, CACA167,9276.2%–

45Stanislaus County, CACA557,7196.2%–

46Riverside County, CACA2,544,9165.6%–

47Alameda County, CACA1,636,6305.6%–

48San Joaquin County, CACA823,8155.6%–

49San Bernardino County, CACA2,224,0915.2%–

50Kern County, CACA927,0684.8%–

51Fresno County, CACA1,035,4564.8%–

52Santa Clara County, CACA1,914,3914.7%–

53Monterey County, CACA433,7294.5%–

54Merced County, CACA297,2604.0%–

55Kings County, CACA154,3274.0%–

56Tulare County, CACA485,1463.8%–

57Los Angeles County, CACA9,694,9343.6%–

58Imperial County, CACA181,4111.8%–

SHOWING 1–58 OF 58

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