Ranking of California Counties By Percentage of Population with Unclassified Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 6.69M people in California with Unclassified ancestry (16.96% of California population). Among all California counties, Sierra County had the highest percentage of its population with Unclassified ancestry (36.18%), followed by Trinity County (33.33%), and Plumas County (30.21%).
The chart and table below shows the top 10 counties with high percentage of its population having Unclassified 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 Unclassified Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Sierra County | 36.18 |
| 2 | Trinity County | 33.33 |
| 3 | Plumas County | 30.21 |
| 4 | Lake County | 28.58 |
| 5 | Del Norte County | 27.41 |
| 6 | Humboldt County | 25.72 |
| 7 | Butte County | 24.95 |
| 8 | Siskiyou County | 24.67 |
| 9 | El Dorado County | 24.27 |
| 10 | Shasta County | 23.54 |
| 11 | Yuba County | 22.40 |
| 12 | Orange County | 22.19 |
| 13 | Mendocino County | 21.54 |
| 14 | San Luis Obispo County | 21.07 |
| 15 | Lassen County | 20.27 |
| 16 | Tehama County | 20.08 |
| 17 | Napa County | 20.07 |
| 18 | Sutter County | 19.54 |
| 19 | Santa Cruz County | 18.86 |
| 20 | San Diego County | 18.74 |
| 21 | Marin County | 18.42 |
| 22 | Amador County | 18.34 |
| 23 | Sonoma County | 18.07 |
| 24 | Contra Costa County | 17.77 |
| 25 | Inyo County | 17.69 |
| 26 | Nevada County | 17.66 |
| 27 | Riverside County | 17.53 |
| 28 | Placer County | 17.49 |
| 29 | Santa Barbara County | 17.33 |
| 30 | Calaveras County | 17.28 |
| 31 | San Francisco County | 17.25 |
| 32 | Sacramento County | 17.24 |
| 33 | Solano County | 16.90 |
| 34 | Fresno County | 16.86 |
| 35 | Mono County | 16.65 |
| 36 | Glenn County | 16.62 |
| 37 | San Joaquin County | 16.49 |
| 38 | Monterey County | 16.41 |
| 39 | San Bernardino County | 16.38 |
| 40 | San Mateo County | 16.37 |
| 41 | Alameda County | 16.31 |
| 42 | San Benito County | 16.29 |
| 43 | Madera County | 16.05 |
| 44 | Alpine County | 16.00 |
| 45 | Mariposa County | 15.86 |
| 46 | Kern County | 15.78 |
| 47 | Tulare County | 15.71 |
| 48 | Santa Clara County | 15.67 |
| 49 | Kings County | 15.26 |
| 50 | Modoc County | 15.09 |
| 51 | Yolo County | 15.06 |
| 52 | Ventura County | 14.77 |
| 53 | Los Angeles County | 14.66 |
| 54 | Stanislaus County | 13.68 |
| 55 | Merced County | 12.36 |
| 56 | Colusa County | 12.10 |
| 57 | Tuolumne County | 12.06 |
| 58 | Imperial County | 11.88 |
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