Ranking of California Counties By Percentage of Population with Italian Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.39M people in California with Italian ancestry (3.52% of California population). Among all California counties, Sonoma County had the highest percentage of its population with Italian ancestry (8.27%), followed by Marin County (7.76%), and Plumas County (7.51%).
The chart and table below shows the top 10 counties with high percentage of its population having Italian 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 Italian Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Sonoma County | 8.27 |
| 2 | Marin County | 7.76 |
| 3 | Plumas County | 7.51 |
| 4 | El Dorado County | 6.83 |
| 5 | Calaveras County | 6.75 |
| 6 | Placer County | 6.56 |
| 7 | San Luis Obispo County | 6.55 |
| 8 | Amador County | 6.41 |
| 9 | San Benito County | 6.37 |
| 10 | Mariposa County | 6.25 |
| 11 | Tuolumne County | 6.02 |
| 12 | Nevada County | 5.90 |
| 13 | Napa County | 5.62 |
| 14 | Santa Cruz County | 5.61 |
| 15 | Sierra County | 5.55 |
| 15 | Siskiyou County | 5.55 |
| 16 | Inyo County | 5.53 |
| 16 | Shasta County | 5.53 |
| 17 | Contra Costa County | 5.12 |
| 17 | Lake County | 5.12 |
| 17 | Mono County | 5.12 |
| 18 | San Mateo County | 5.10 |
| 19 | Humboldt County | 5.09 |
| 20 | Butte County | 5.01 |
| 21 | Mendocino County | 4.77 |
| 22 | Alpine County | 4.69 |
| 23 | San Francisco County | 4.59 |
| 24 | Ventura County | 4.35 |
| 25 | Glenn County | 4.09 |
| 26 | San Diego County | 4.06 |
| 27 | Sacramento County | 4.04 |
| 28 | Santa Barbara County | 3.98 |
| 29 | Yolo County | 3.97 |
| 30 | Orange County | 3.86 |
| 31 | San Joaquin County | 3.68 |
| 32 | Tehama County | 3.65 |
| 33 | Stanislaus County | 3.60 |
| 34 | Santa Clara County | 3.58 |
| 35 | Solano County | 3.48 |
| 36 | Del Norte County | 3.37 |
| 37 | Monterey County | 3.29 |
| 37 | Trinity County | 3.29 |
| 38 | Riverside County | 3.18 |
| 39 | Alameda County | 3.07 |
| 40 | Yuba County | 2.93 |
| 41 | Colusa County | 2.92 |
| 42 | Lassen County | 2.62 |
| 43 | Fresno County | 2.58 |
| 43 | San Bernardino County | 2.58 |
| 44 | Los Angeles County | 2.56 |
| 45 | Sutter County | 2.46 |
| 46 | Merced County | 2.28 |
| 47 | Madera County | 2.26 |
| 48 | Kern County | 1.95 |
| 49 | Kings County | 1.82 |
| 50 | Modoc County | 1.73 |
| 51 | Tulare County | 1.38 |
| 52 | Imperial County | 0.68 |
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