Ranking of California Counties By Percentage of Population with Scotch Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 195.80K people in California with Scotch Irish ancestry (0.50% of California population). Among all California counties, Modoc County had the highest percentage of its population with Scotch Irish ancestry (2.44%), followed by Tuolumne County (2.17%), and Amador County (1.71%).
The chart and table below shows the top 10 counties with high percentage of its population having Scotch Irish ancestry.
You can see similar information for other states and for other ancestry groups in California.
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Related Topics: California ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of California Counties By Percentage of Population with Scotch Irish Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Modoc County | 2.44 |
| 2 | Tuolumne County | 2.17 |
| 3 | Amador County | 1.71 |
| 4 | San Benito County | 1.64 |
| 5 | Mariposa County | 1.62 |
| 6 | Humboldt County | 1.56 |
| 7 | Del Norte County | 1.54 |
| 8 | Sierra County | 1.46 |
| 9 | Calaveras County | 1.43 |
| 10 | Plumas County | 1.35 |
| 11 | El Dorado County | 1.30 |
| 12 | Nevada County | 1.27 |
| 13 | Mendocino County | 1.23 |
| 14 | Sonoma County | 1.14 |
| 15 | Marin County | 1.10 |
| 16 | Siskiyou County | 1.05 |
| 17 | Lake County | 1.02 |
| 18 | Placer County | 0.98 |
| 19 | Santa Cruz County | 0.97 |
| 20 | Butte County | 0.93 |
| 21 | San Luis Obispo County | 0.91 |
| 22 | Glenn County | 0.89 |
| 23 | Shasta County | 0.87 |
| 24 | Trinity County | 0.86 |
| 24 | Yolo County | 0.86 |
| 25 | Tehama County | 0.74 |
| 26 | Lassen County | 0.73 |
| 26 | Santa Barbara County | 0.73 |
| 27 | Ventura County | 0.70 |
| 28 | Sacramento County | 0.69 |
| 29 | Alpine County | 0.67 |
| 30 | Contra Costa County | 0.62 |
| 30 | San Diego County | 0.62 |
| 31 | Inyo County | 0.61 |
| 31 | Solano County | 0.61 |
| 32 | Napa County | 0.60 |
| 33 | Yuba County | 0.57 |
| 34 | Madera County | 0.52 |
| 34 | Sutter County | 0.52 |
| 35 | Orange County | 0.51 |
| 35 | San Joaquin County | 0.51 |
| 36 | Kern County | 0.48 |
| 36 | Riverside County | 0.48 |
| 37 | Fresno County | 0.45 |
| 37 | Mono County | 0.45 |
| 38 | Alameda County | 0.44 |
| 39 | Stanislaus County | 0.43 |
| 40 | San Francisco County | 0.42 |
| 41 | San Mateo County | 0.41 |
| 42 | Monterey County | 0.39 |
| 42 | Tulare County | 0.39 |
| 43 | Colusa County | 0.38 |
| 44 | San Bernardino County | 0.37 |
| 45 | Santa Clara County | 0.34 |
| 46 | Los Angeles County | 0.29 |
| 47 | Merced County | 0.28 |
| 48 | Kings County | 0.20 |
| 49 | Imperial County | 0.11 |
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