Foreign-Born Residents Percentage of Population, by Bay Area County
2024 U.S. Census ACS 1-year estimates, released 9/2025
The largest source of the foreign-born populations of Santa Clara, San Mateo, San Francisco, Alameda, Contra Costa & Solano Counties has been from Asian countries – especially China and India – while in Monterey, Sonoma, Napa, Marin and Santa Cruz, the largest share came from Latin America.
42%
40%
36%
35%
34%
35%
Approximately 55% to 60% of foreign-born Bay Area residents are now naturalized U.S. citizens.
30%
30%
28%
25%
22%
21%
20%
20%
17% 17%
15%
10%
5%
0%
Santa Clara
San Mateo
Alameda San
Monterey Contra Costa
Solano Napa Marin Santa Cruz
Sonoma
Francisco
These analyses were performed in good faith with data derived from sources deemed reliable, but may contain errors and are subject to revision. Published with margins of error. All numbers approximate.
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