Counties in California by foreign-born share of the population
Santa Clara County had the highest foreign-born share of the population of 58 counties in 2023, at 41%. Sierra County had the lowest, at 2.3%. The median was 19.4% and the figure for California was 26.7%. Source: the U.S. Census Bureau.
All counties, 2023
Full ranking
Other periods
About this ranking
People who were not US citizens at birth, as a percentage of the total population. Includes naturalized citizens, lawful permanent residents, temporary migrants and unauthorized immigrants. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.
Based on place of birth, not nationality: a naturalized citizen counts as foreign born, and people born in Puerto Rico, the US island areas or abroad to American parents count as native. Not comparable with foreign_population_share, which counts foreign nationals in Spain and the EU. Calculated from counts in ACS table B05002, which are stored as inputs.
Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.
How to cite
U.S. Census Bureau. American Community Survey 5-year estimates, table B05002: foreign-born population as a percentage of the total population, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b05002.dat. Retrieved 2026-10-09.Use this data in your AI agent
Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:
Rank Counties in California by foreign-born share of the population using official data, and cite the source.
rank_places {"indicator":"foreign_born_share","level":"province","within":"California","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=foreign_born_share&level=province&within=California&limit=10Questions
Which county has the highest foreign-born share of the population?
Santa Clara County, with 41% in 2023, according to the U.S. Census Bureau.
Which county has the lowest foreign-born share of the population?
Sierra County, with 2.3% in 2023.
Where does this ranking come from?
Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B05002: foreign-born population as a percentage of the total population, calculated with stored inputs. Retrieved 2026-10-09.
Foreign-born population share: other rankings
- US states
- US counties
- Counties in Texas
- Counties in Georgia
- Counties in Virginia
- Counties in Kentucky
- Counties in Missouri
- Counties in Kansas
- Counties in Illinois
- Counties in North Carolina
- Counties in Iowa
- Counties in Tennessee
Counties in California: more rankings
- Asian population share
- Bachelor's degree or higher, population 25 and over
- Live births, July to June
- Black or African American population share
- Crude birth rate, July to June
- Crude death rate, July to June
- Deaths, July to June
- Real GDP growth
- GDP per capita, US dollars
- Gross domestic product (GDP), US dollars
- Hispanic or Latino population share
- Homeownership rate (US, housing units)
- Median age
- Median gross rent (monthly)
- Median home value
- Median household income