Ranking of California Counties By Population with Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 2.32M people in California with Irish ancestry. Among all California counties, Los Angeles County had the highest population with Irish ancestry (364.40K), followed by San Diego County (244.28K), and Orange County (198.63K).
The chart and table below shows the top 10 counties with high number of people with 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 Population with Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Los Angeles County | 364402 |
| 2 | San Diego County | 244282 |
| 3 | Orange County | 198632 |
| 4 | Riverside County | 134544 |
| 5 | San Bernardino County | 109621 |
| 6 | Sacramento County | 108732 |
| 7 | Alameda County | 92715 |
| 8 | Santa Clara County | 90667 |
| 9 | Contra Costa County | 89102 |
| 10 | San Francisco County | 65759 |
| 11 | Ventura County | 64838 |
| 12 | Sonoma County | 60029 |
| 13 | San Mateo County | 52571 |
| 14 | Fresno County | 47841 |
| 15 | Kern County | 41783 |
| 16 | Placer County | 41742 |
| 17 | San Joaquin County | 41564 |
| 18 | San Luis Obispo County | 34944 |
| 19 | Stanislaus County | 33871 |
| 20 | Marin County | 32964 |
| 21 | Santa Barbara County | 32853 |
| 22 | Solano County | 29247 |
| 23 | Santa Cruz County | 28763 |
| 24 | Butte County | 22800 |
| 25 | El Dorado County | 21817 |
| 26 | Shasta County | 21379 |
| 27 | Monterey County | 20120 |
| 28 | Tulare County | 17702 |
| 29 | Yolo County | 16818 |
| 30 | Humboldt County | 14633 |
| 31 | Nevada County | 11628 |
| 32 | Napa County | 11507 |
| 33 | Merced County | 11412 |
| 34 | Madera County | 10191 |
| 35 | Mendocino County | 9859 |
| 36 | Sutter County | 8574 |
| 37 | Tuolumne County | 8097 |
| 38 | Yuba County | 6990 |
| 39 | Lake County | 6964 |
| 40 | Tehama County | 6784 |
| 41 | Calaveras County | 6678 |
| 42 | Kings County | 5872 |
| 43 | Siskiyou County | 5546 |
| 44 | Amador County | 5440 |
| 45 | San Benito County | 3875 |
| 46 | Imperial County | 3275 |
| 47 | Mariposa County | 3209 |
| 48 | Lassen County | 2720 |
| 49 | Del Norte County | 2604 |
| 50 | Plumas County | 1933 |
| 51 | Trinity County | 1753 |
| 52 | Inyo County | 1590 |
| 53 | Colusa County | 1580 |
| 54 | Glenn County | 1491 |
| 55 | Mono County | 1466 |
| 56 | Modoc County | 1124 |
| 57 | Sierra County | 304 |
| 58 | Alpine County | 159 |
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