Ranking of California Counties By Population with American Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.15M people in California with American ancestry. Among all California counties, Los Angeles County had the highest population with American ancestry (331.69K), followed by Orange County (136.68K), and San Diego County (89.45K).
The chart and table below shows the top 10 counties with high number of people with American 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 American Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Los Angeles County | 331693 |
| 2 | Orange County | 136675 |
| 3 | San Diego County | 89451 |
| 4 | Riverside County | 67008 |
| 5 | San Bernardino County | 51396 |
| 6 | Ventura County | 42570 |
| 7 | Santa Clara County | 37912 |
| 8 | Sacramento County | 36547 |
| 9 | Alameda County | 33854 |
| 10 | Kern County | 32778 |
| 11 | Contra Costa County | 29190 |
| 12 | San Francisco County | 21307 |
| 13 | San Mateo County | 18796 |
| 14 | Stanislaus County | 15514 |
| 15 | Butte County | 15429 |
| 16 | Fresno County | 14680 |
| 17 | Shasta County | 13561 |
| 18 | Placer County | 13491 |
| 19 | Sonoma County | 12237 |
| 20 | San Joaquin County | 11637 |
| 21 | Santa Barbara County | 10167 |
| 22 | Solano County | 10026 |
| 23 | San Luis Obispo County | 9055 |
| 24 | Tulare County | 8938 |
| 25 | El Dorado County | 6819 |
| 26 | Monterey County | 6676 |
| 27 | Marin County | 6297 |
| 28 | Santa Cruz County | 6227 |
| 29 | Tehama County | 4597 |
| 30 | Merced County | 4533 |
| 31 | Yolo County | 4394 |
| 32 | Napa County | 4203 |
| 33 | Humboldt County | 4021 |
| 34 | Sutter County | 3369 |
| 35 | Madera County | 3118 |
| 36 | Nevada County | 2866 |
| 37 | Lake County | 2462 |
| 38 | Imperial County | 2461 |
| 39 | Kings County | 1875 |
| 40 | Yuba County | 1832 |
| 41 | Trinity County | 1752 |
| 42 | Siskiyou County | 1737 |
| 43 | Mendocino County | 1736 |
| 44 | Amador County | 1486 |
| 45 | Tuolumne County | 1448 |
| 46 | San Benito County | 1151 |
| 47 | Calaveras County | 1131 |
| 48 | Glenn County | 1065 |
| 49 | Del Norte County | 1000 |
| 50 | Lassen County | 966 |
| 51 | Inyo County | 626 |
| 52 | Mariposa County | 605 |
| 53 | Plumas County | 575 |
| 54 | Modoc County | 524 |
| 55 | Colusa County | 449 |
| 56 | Mono County | 448 |
| 57 | Alpine County | 49 |
| 58 | Sierra County | 45 |
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