Foreign immigration into Southern California has sharply declined over the last year, a trend directly linked to the stricter immigration enforcement initiated by the Trump administration. This significant shift has resulted in a 53% reduction in foreign arrivals when compared to the preceding four years in the five-county region.

Measuring the Immigration Shift in Southern California

Data Comparison and Overall Impact

The analysis tracked net foreign immigration—arrivals versus departures—for major metropolitan areas from April 2020 through July 2025, regardless of legal status. The figures for the year ending July 2025 were benchmarked against the annualized rate from April 2020 through July 2024.

In the five counties comprising Southern California, the net foreign immigration count for the past year stood at 46,700. This represents a decrease of 53,700 people from the previous four-year inflow pace, marking the 53% tumble.

This reduced immigrant inflow contributed to a slight contraction in Southern California's total population. The region recorded a loss of 209,300 residents over five years, a 1% decline, bringing the total population to 20.9 million.

Timeline of Policy Implementation

The observed population changes reflect only the initial months of the Trump administration's efforts to significantly limit the nation's immigrant population. Donald Trump commenced his second presidential term in January 2025.

Regional Debates and National Context

Economic Consequences of Reduced Inflow

The tightening of immigration policies has ignited considerable debate, particularly concerning the economic ramifications for a region historically reliant on foreign-born residents. Critics argue that the drop in new arrivals negatively impacts the business climate.

These critics point to falling demand for goods and increasing worker shortages, especially in lower-wage sectors often filled by immigrants. Conversely, proponents of the stricter policies contend that reduced inflow eases pressure on essential public infrastructure, including housing, schools, and other services.

National and Statewide Comparisons

Nationally, the 50 largest U.S. metropolitan areas experienced a 24% drop in foreign immigration last year, totaling 952,200 arrivals—a decrease of 297,900 from the prior pace. Southern California accounted for 16% of this national decline.

Despite the immigration dip, the overall population across these 50 large markets grew by 3% over five years to 189 million residents. Meanwhile, the rest of California saw a 39% reduction in foreign immigration, with 62,600 arrivals last year.

Deep Dive into Southern California Metro Areas

Inland Empire Suffers Steepest Percentage Drop

The Inland Empire, encompassing Riverside and San Bernardino counties, recorded only 2,000 foreign immigrants last year. This figure is an 85% reduction, or 11,800 fewer people, compared to the 2020-2024 pace, representing the second-largest percentage drop among the 50 major U.S. metros.

Despite this, the Inland Empire's overall population still grew by 4% over five years to 4.8 million, ranking 20th best among the 50 large metros.

Los Angeles-Orange County Population Decline

The metro area covering Los Angeles and Orange counties saw 38,500 foreign immigrants last year, a 48% decrease from the earlier pace. This 35,700 reduction ranked as the sixth-largest decline among the 50 metros.

This area experienced the most significant overall population contraction among the 50 large metros, falling 3% over five years to 12.8 million residents, a loss of 360,300 people.

San Diego County Immigration Halved

San Diego County registered 6,100 foreign immigrants last year, matching the total decrease from the previous four-year pace. This 50% drop was the fourth-largest percentage decline observed across the 50 major metropolitan areas.

San Diego's overall population also decreased by 16,400 residents over the five-year period, resulting in a total population of 3.3 million. This 0.5% decline ranked as the sixth-biggest population drop among the surveyed metros.