How 4.5 Million Border Migrants Reshaped the Sun Belt’s Population Map

Millions of migrants released after crossing the U.S.-Mexico border did not simply move into the country’s traditional immigrant gateways. Many headed into fast-growing Sun Belt cities and suburbs, helping create new migration corridors from Florida to Texas, Tennessee, Oklahoma, Georgia and New Mexico.

Federal records covering 4.5 million people released between October 2018 and July 2025 show Florida as the most common destination state overall. But the movement spread much more widely than Miami and other familiar immigrant centers.

Venezuelans moved into parts of metro Atlanta, Dallas and Houston, as well as Albuquerque and Savannah. Cubans were still heavily concentrated in Florida, but some headed to Odessa, Texas, and other cities farther inland. Guatemalan women appeared in notable numbers in Chattanooga, Tennessee, while Tulsa, Oklahoma, drew Mexican women and children.

That geographic spread is one of the most important findings in the data.

Many newer arrivals bypassed the places immigrants had traditionally chosen and moved instead toward smaller cities or rapidly growing metros where housing, jobs or existing family networks appeared more attractive. Knoxville was among the communities that experienced visible change despite having a smaller immigrant base than cities such as Miami, Los Angeles or New York.

Florida remained the largest destination

Florida remained the No. 1 destination state in the federal records.

Cubans were particularly concentrated there, with nine of their 10 most common destination ZIP codes in Florida. Venezuelans showed a more dispersed pattern. About 1 million Venezuelans were released into the United States during the period, and many chose places outside South Florida, including growing communities in Texas, Georgia, Utah and New Mexico.

The pattern suggests that language and established immigrant communities were not the only factors guiding settlement. Jobs, housing costs, traffic and family connections also shaped where people planned to go.

Women and children changed the migration pattern

The records also show a major change in who was arriving. Nearly six in 10 migrants released at the border were women and children. Earlier border migration had been much more heavily dominated by adult men.

That shift matters for local communities because families place different demands on schools, housing, health care and other services than single working-age adults.

It also helps explain why the effects of the migration wave became visible far beyond border states.

The records show destinations, not where everyone lives today

Migrants provided Customs and Border Protection with a U.S. address before release. Those ZIP codes show their intended destinations at that moment, not necessarily where they eventually settled or where they live now. Some moved again, left the country or never reached the address they initially provided.

The dataset includes 4,510,850 people after duplicate records and entries without usable destination ZIP codes were removed. It covers migrants released to pursue asylum or other immigration proceedings after encounters at the southern border.

Even with those limits, the records reveal how widely the migration surge spread through the country.

For the Sun Belt, the picture is especially clear: Florida remained the largest destination, but the movement increasingly reached communities in Texas, Tennessee, Oklahoma, Georgia and New Mexico that had not previously been major gateways for new international arrivals.