Ranking of California Counties By 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. Among all California counties, Los Angeles County had the highest population with Unclassified ancestry (1.47M), followed by Orange County (706.15K), and San Diego County (617.83K).
The chart and table below shows the top 10 counties with high number of people with 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 Population with Unclassified Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Los Angeles County | 1468756 |
| 2 | Orange County | 706153 |
| 3 | San Diego County | 617828 |
| 4 | Riverside County | 422452 |
| 5 | San Bernardino County | 355586 |
| 6 | Santa Clara County | 302719 |
| 7 | Alameda County | 272895 |
| 8 | Sacramento County | 270899 |
| 9 | Contra Costa County | 206390 |
| 10 | Fresno County | 169181 |
| 11 | San Francisco County | 149397 |
| 12 | Kern County | 142887 |
| 13 | San Joaquin County | 127201 |
| 14 | Ventura County | 124845 |
| 15 | San Mateo County | 124803 |
| 16 | Sonoma County | 89000 |
| 17 | Santa Barbara County | 77590 |
| 18 | Solano County | 76282 |
| 19 | Stanislaus County | 75355 |
| 20 | Tulare County | 73995 |
| 21 | Monterey County | 72013 |
| 22 | Placer County | 70023 |
| 23 | San Luis Obispo County | 59565 |
| 24 | Butte County | 54356 |
| 25 | Santa Cruz County | 51313 |
| 26 | Marin County | 48335 |
| 27 | El Dorado County | 46257 |
| 28 | Shasta County | 42821 |
| 29 | Humboldt County | 35244 |
| 30 | Merced County | 34506 |
| 31 | Yolo County | 32625 |
| 32 | Napa County | 27850 |
| 33 | Madera County | 25089 |
| 34 | Kings County | 23182 |
| 35 | Imperial County | 21387 |
| 36 | Mendocino County | 19712 |
| 37 | Lake County | 19363 |
| 38 | Sutter County | 19362 |
| 39 | Nevada County | 18032 |
| 40 | Yuba County | 18012 |
| 41 | Tehama County | 13121 |
| 42 | Siskiyou County | 10894 |
| 43 | San Benito County | 10317 |
| 44 | Calaveras County | 7835 |
| 45 | Del Norte County | 7581 |
| 46 | Amador County | 7355 |
| 47 | Lassen County | 6678 |
| 48 | Tuolumne County | 6660 |
| 49 | Plumas County | 5930 |
| 50 | Trinity County | 5272 |
| 51 | Glenn County | 4765 |
| 52 | Inyo County | 3327 |
| 53 | Mariposa County | 2731 |
| 54 | Colusa County | 2636 |
| 55 | Mono County | 2213 |
| 56 | Modoc County | 1316 |
| 57 | Sierra County | 1114 |
| 58 | Alpine County | 215 |
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