California Immigrant or Foreign-Born Population By County in 2021 (ACS-5Yrs)
Based on the US Census ACS-5Yrs estimates, in 2021, the total immigrant or foreign-born population in California was 10.46M which was 26.50% of California's population. Among all California counties, Los Angeles had the highest immigrant population (3.35M) and immigrants constituted 33.47% of its population, followed by Orange (pop: 937.21K, perc: 29.45%), and then Santa Clara (pop: 771.64K, perc: 39.94%).
On the other hand, the counties with the least number of immigrant population were: Alpine (pop: 64, perc: 4.76%), Sierra (pop: 101, perc: 3.28%), and Modoc (pop: 627, perc: 7.19%),
The chart and table below shows the immigrant or foreign-born population of each county and the percentage of each county's population that are immigrants.
You can see similar information for other states and by state for the United States.
| County | Immigrant Population | % of County Population |
|---|---|---|
| Alameda | 551151 | 32.94 |
| Alpine | 64 | 4.76 |
| Amador | 2507 | 6.25 |
| Butte | 16581 | 7.61 |
| Calaveras | 2156 | 4.75 |
| Colusa | 5812 | 26.69 |
| Contra Costa | 289971 | 24.96 |
| Del Norte | 2264 | 8.19 |
| El Dorado | 17659 | 9.27 |
| Fresno | 199858 | 19.92 |
| Glenn | 4601 | 16.05 |
| Humboldt | 8335 | 6.08 |
| Imperial | 53889 | 29.93 |
| Inyo | 1325 | 7.05 |
| Kern | 177999 | 19.65 |
| Kings | 29042 | 19.12 |
| Lake | 6049 | 8.93 |
| Lassen | 1775 | 5.39 |
| Los Angeles | 3353972 | 33.47 |
| Madera | 31171 | 19.94 |
| Marin | 48530 | 18.50 |
| Mariposa | 959 | 5.57 |
| Mendocino | 11291 | 12.34 |
| Merced | 72635 | 26.02 |
| Modoc | 627 | 7.19 |
| Mono | 2235 | 16.82 |
| Monterey | 127488 | 29.04 |
| Napa | 29822 | 21.49 |
| Nevada | 6235 | 6.11 |
| Orange | 937214 | 29.45 |
| Placer | 46938 | 11.73 |
| Plumas | 716 | 3.65 |
| Riverside | 518941 | 21.54 |
| Sacramento | 330496 | 21.03 |
| San Benito | 12650 | 19.98 |
| San Bernardino | 448440 | 20.66 |
| San Diego | 749110 | 22.73 |
| San Francisco | 295398 | 34.11 |
| San Joaquin | 179920 | 23.32 |
| San Luis Obispo | 27338 | 9.67 |
| San Mateo | 267704 | 35.11 |
| Santa Barbara | 100250 | 22.40 |
| Santa Clara | 771644 | 39.94 |
| Santa Cruz | 48513 | 17.83 |
| Shasta | 10118 | 5.56 |
| Sierra | 101 | 3.28 |
| Siskiyou | 2572 | 5.83 |
| Solano | 89017 | 19.72 |
| Sonoma | 80398 | 16.33 |
| Stanislaus | 110931 | 20.14 |
| Sutter | 21629 | 21.83 |
| Tehama | 5561 | 8.51 |
| Trinity | 1227 | 7.76 |
| Tulare | 102060 | 21.67 |
| Tuolumne | 2914 | 5.28 |
| Ventura | 178462 | 21.11 |
| Yolo | 48433 | 22.35 |
| Yuba | 10251 | 12.75 |