California Immigrant or Foreign-Born Population By County in 2021 (ACS-5Yrs)

Updated on September 26, 2024.

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.

California Immigrant or Foreign-Born Population By County in 2021
California Immigrant or Foreign-Born Population By County in 2021
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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