RANKING · 2010 CENSUS · 58 SHOWN OF 58

Highest Scotch-Irish population share, California counties · 2010

California counties ranked by the share of all residents who are Scotch-Irish ancestry (2010 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. The median across all 58 is 1.7%.

Scotch-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

RANKPLACESTATEPOPSCOTCH-IRISH SHAREVS –

01Sierra County, CACA3,0985.1%–

02Trinity County, CACA15,7204.6%–

03Nevada County, CACA101,9113.6%–

04Mono County, CACA12,5053.5%–

05Mariposa County, CACA16,9183.4%–

06Amador County, CACA41,8763.0%–

07Butte County, CACA209,2112.9%–

08Plumas County, CACA18,5832.9%–

09Calaveras County, CACA46,6052.8%–

10Humboldt County, CACA131,6472.8%–

11Siskiyou County, CACA42,0132.8%–

12Tuolumne County, CACA53,1602.8%–

13Lake County, CACA67,7722.7%–

14Yuba County, CACA88,6912.6%–

15San Luis Obispo County, CACA282,3672.6%–

16Shasta County, CACA181,6482.5%–

17El Dorado County, CACA192,3232.5%–

18Del Norte County, CACA26,4102.5%–

19Sonoma County, CACA486,4442.3%–

20Modoc County, CACA8,4262.3%–

21Marin County, CACA253,6942.3%–

22Inyo County, CACA18,1582.3%–

23Mendocino County, CACA88,1222.2%–

24Yolo County, CACA224,4102.1%–

25Placer County, CACA442,0812.0%–

26Santa Cruz County, CACA258,8521.9%–

27Tehama County, CACA64,6651.9%–

28Napa County, CACA132,9491.9%–

29Santa Barbara County, CACA442,0651.7%–

30Alpine County, CACA1,0431.7%–

31Contra Costa County, CACA1,170,0701.5%–

32Sacramento County, CACA1,618,4601.5%–

33San Diego County, CACA3,282,2481.5%–

34Lassen County, CACA28,1171.5%–

35Ventura County, CACA830,8511.5%–

36Monterey County, CACA433,7291.5%–

37Stanislaus County, CACA557,7191.3%–

38Solano County, CACA455,3761.3%–

39Madera County, CACA167,9271.3%–

40Sutter County, CACA98,7871.2%–

41Orange County, CACA3,149,5071.2%–

42Kern County, CACA927,0681.2%–

43San Benito County, CACA70,0821.2%–

44Riverside County, CACA2,544,9161.2%–

45Kings County, CACA154,3271.2%–

46Alameda County, CACA1,636,6301.1%–

47Colusa County, CACA21,8361.1%–

48Glenn County, CACA28,1411.1%–

49San Francisco County, CACA826,0791.1%–

50San Mateo County, CACA743,5681.0%–

51San Joaquin County, CACA823,8151.0%–

52Fresno County, CACA1,035,4561.0%–

53San Bernardino County, CACA2,224,0911.0%–

54Santa Clara County, CACA1,914,3910.9%–

55Merced County, CACA297,2600.7%–

56Los Angeles County, CACA9,694,9340.7%–

57Tulare County, CACA485,1460.7%–

58Imperial County, CACA181,4110.4%–

SHOWING 1–58 OF 58

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