RANKING · 2024 ACS · 58 SHOWN OF 58

Highest Scotch-Irish population share, California counties

California counties ranked by the share of all residents who are Scotch-Irish ancestry (2023 American Community Survey). A concentration measure: Scotch-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

RANKPLACESTATEPOPSCOTCH-IRISH SHAREVS 2000

01Tuolumne County, CACA53,1602.9%–

02Modoc County, CACA8,4262.8%–

03Trinity County, CACA15,7201.6%–

04Humboldt County, CACA131,6471.5%–

05Mendocino County, CACA88,1221.4%–

06Yolo County, CACA224,4101.2%–

07Nevada County, CACA101,9111.2%–

08Sonoma County, CACA486,4441.1%–

09Inyo County, CACA18,1581.1%–

10Amador County, CACA41,8761.1%–

11Marin County, CACA253,6941.0%–

12San Benito County, CACA70,0821.0%–

13Santa Cruz County, CACA258,8521.0%–

14Calaveras County, CACA46,6050.9%–

15Butte County, CACA209,2110.9%–

16Shasta County, CACA181,6480.9%–

17San Luis Obispo County, CACA282,3670.9%–

18El Dorado County, CACA192,3230.9%–

19Glenn County, CACA28,1410.9%–

20Lake County, CACA67,7720.9%–

21Placer County, CACA442,0810.9%–

22Plumas County, CACA18,5830.9%–

23Siskiyou County, CACA42,0130.8%–

24Mariposa County, CACA16,9180.7%–

25Del Norte County, CACA26,4100.7%–

26Tehama County, CACA64,6650.7%–

27Santa Barbara County, CACA442,0650.6%–

28Sacramento County, CACA1,618,4600.6%–

29Mono County, CACA12,5050.6%–

30Contra Costa County, CACA1,170,0700.6%–

31Lassen County, CACA28,1170.6%–

32San Diego County, CACA3,282,2480.6%–

33Solano County, CACA455,3760.6%–

34Sutter County, CACA98,7870.6%–

35Ventura County, CACA830,8510.6%–

36Napa County, CACA132,9490.5%–

37Madera County, CACA167,9270.5%–

38Colusa County, CACA21,8360.5%–

39Orange County, CACA3,149,5070.5%–

40San Joaquin County, CACA823,8150.5%–

41San Francisco County, CACA826,0790.5%–

42Alameda County, CACA1,636,6300.4%–

43Monterey County, CACA433,7290.4%–

44Yuba County, CACA88,6910.4%–

45Fresno County, CACA1,035,4560.4%–

46Stanislaus County, CACA557,7190.4%–

47Kern County, CACA927,0680.4%–

48Riverside County, CACA2,544,9160.4%–

49Alpine County, CACA1,0430.4%–

50San Mateo County, CACA743,5680.4%–

51San Bernardino County, CACA2,224,0910.3%–

52Tulare County, CACA485,1460.3%–

53Kings County, CACA154,3270.3%–

54Santa Clara County, CACA1,914,3910.3%–

55Sierra County, CACA3,0980.3%–

56Los Angeles County, CACA9,694,9340.3%–

57Merced County, CACA297,2600.2%–

58Imperial County, CACA181,4110.1%–

SHOWING 1–58 OF 58

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