RANKING · 2020 CENSUS · 58 SHOWN OF 58

Highest Scotch-Irish population share, California counties · 2020

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

01Modoc County, CACA8,4262.4%–

02Sierra County, CACA3,0982.0%–

03Amador County, CACA41,8762.0%–

04Tuolumne County, CACA53,1601.9%–

05Mariposa County, CACA16,9181.8%–

06Del Norte County, CACA26,4101.7%–

07Plumas County, CACA18,5831.7%–

08Humboldt County, CACA131,6471.6%–

09San Benito County, CACA70,0821.5%–

10Glenn County, CACA28,1411.4%–

11El Dorado County, CACA192,3231.4%–

12Nevada County, CACA101,9111.4%–

13Calaveras County, CACA46,6051.4%–

14Siskiyou County, CACA42,0131.4%–

15Mendocino County, CACA88,1221.2%–

16Marin County, CACA253,6941.1%–

17Sonoma County, CACA486,4441.1%–

18Butte County, CACA209,2111.1%–

19Santa Cruz County, CACA258,8521.1%–

20Placer County, CACA442,0811.0%–

21Lake County, CACA67,7721.0%–

22San Luis Obispo County, CACA282,3671.0%–

23Shasta County, CACA181,6480.9%–

24Yolo County, CACA224,4100.9%–

25Tehama County, CACA64,6650.8%–

26Yuba County, CACA88,6910.8%–

27Santa Barbara County, CACA442,0650.8%–

28Napa County, CACA132,9490.8%–

29Trinity County, CACA15,7200.8%–

30Ventura County, CACA830,8510.7%–

31Sacramento County, CACA1,618,4600.7%–

32Contra Costa County, CACA1,170,0700.7%–

33Inyo County, CACA18,1580.7%–

34Lassen County, CACA28,1170.6%–

35San Diego County, CACA3,282,2480.6%–

36Solano County, CACA455,3760.6%–

37Madera County, CACA167,9270.6%–

38Riverside County, CACA2,544,9160.6%–

39Stanislaus County, CACA557,7190.5%–

40Orange County, CACA3,149,5070.5%–

41Kern County, CACA927,0680.5%–

42San Joaquin County, CACA823,8150.5%–

43Fresno County, CACA1,035,4560.5%–

44Alameda County, CACA1,636,6300.5%–

45Sutter County, CACA98,7870.5%–

46Colusa County, CACA21,8360.4%–

47Monterey County, CACA433,7290.4%–

48San Mateo County, CACA743,5680.4%–

49San Francisco County, CACA826,0790.4%–

50San Bernardino County, CACA2,224,0910.4%–

51Tulare County, CACA485,1460.4%–

52Santa Clara County, CACA1,914,3910.4%–

53Mono County, CACA12,5050.4%–

54Alpine County, CACA1,0430.3%–

55Los Angeles County, CACA9,694,9340.3%–

56Kings County, CACA154,3270.3%–

57Merced County, CACA297,2600.3%–

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