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 (2020 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 9.0%.

Irish Americans: full group profile →

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SAME RANKING BYCities States Metros

YEAR2010 2020 2024

RANKPLACESTATEPOPIRISH SHAREVS 2010

01Mariposa County, CACA16,91817.0%−4.9 pts

02Calaveras County, CACA46,60516.0%−1.0 pts

03Tuolumne County, CACA53,16015.5%−0.6 pts

04Amador County, CACA41,87613.7%−4.9 pts

05Mono County, CACA12,50513.0%+0.1 pts

06Modoc County, CACA8,42612.8%−5.2 pts

07Marin County, CACA253,69412.5%−2.5 pts

08Sonoma County, CACA486,44412.4%−1.3 pts

09San Luis Obispo County, CACA282,36712.1%−0.3 pts

10Nevada County, CACA101,91111.9%−6.3 pts

11Siskiyou County, CACA42,01311.8%−3.2 pts

12Sierra County, CACA3,09811.5%−1.2 pts

13Shasta County, CACA181,64811.3%−4.2 pts

14Humboldt County, CACA131,64711.2%−2.2 pts

15Trinity County, CACA15,72011.1%−11.8 pts

16Tehama County, CACA64,66511.0%−3.9 pts

17El Dorado County, CACA192,32310.9%−3.9 pts

18Placer County, CACA442,08110.8%−4.9 pts

19Mendocino County, CACA88,12210.5%−2.8 pts

20Santa Cruz County, CACA258,85210.3%−1.3 pts

21Butte County, CACA209,21110.3%−3.9 pts

22Lake County, CACA67,77210.3%−7.8 pts

23Alpine County, CACA1,04310.1%−4.4 pts

24Plumas County, CACA18,5839.7%−5.7 pts

25Sutter County, CACA98,7879.7%0.0 pts

26Yuba County, CACA88,6919.3%−2.1 pts

27Del Norte County, CACA26,4109.2%−6.1 pts

28Inyo County, CACA18,1589.1%−5.2 pts

29Lassen County, CACA28,1179.0%−5.4 pts

30Napa County, CACA132,9498.4%−2.3 pts

31Contra Costa County, CACA1,170,0707.9%−1.8 pts

32Colusa County, CACA21,8367.9%+0.4 pts

33Yolo County, CACA224,4107.7%−1.7 pts

34Ventura County, CACA830,8517.7%−1.7 pts

35San Francisco County, CACA826,0797.7%−0.5 pts

36Santa Barbara County, CACA442,0657.5%−1.8 pts

37San Diego County, CACA3,282,2487.4%−1.9 pts

38San Mateo County, CACA743,5687.1%−1.5 pts

39Sacramento County, CACA1,618,4607.1%−2.5 pts

40San Benito County, CACA70,0827.0%−1.5 pts

41Solano County, CACA455,3766.6%−1.7 pts

42Orange County, CACA3,149,5076.4%−2.1 pts

43Glenn County, CACA28,1416.2%−3.0 pts

44Madera County, CACA167,9276.2%−0.8 pts

45Stanislaus County, CACA557,7196.2%−2.7 pts

46Riverside County, CACA2,544,9165.6%−2.0 pts

47Alameda County, CACA1,636,6305.6%−0.9 pts

48San Joaquin County, CACA823,8155.6%−1.3 pts

49San Bernardino County, CACA2,224,0915.2%−1.7 pts

50Kern County, CACA927,0684.8%−3.0 pts

51Fresno County, CACA1,035,4564.8%−1.1 pts

52Santa Clara County, CACA1,914,3914.7%−1.3 pts

53Monterey County, CACA433,7294.5%−2.3 pts

54Merced County, CACA297,2604.0%−1.1 pts

55Kings County, CACA154,3274.0%−2.7 pts

56Tulare County, CACA485,1463.8%−1.1 pts

57Los Angeles County, CACA9,694,9343.6%−0.7 pts

58Imperial County, CACA181,4111.8%−0.9 pts

SHOWING 1–58 OF 58

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