On March 26, 2025, the U.S. Census Bureau released its Vintage 2025 county population decline in the US estimates – a detailed annual snapshot of how the American population is shifting across every corner of the country. The data covered all 3,143 counties and the District of Columbia, and the picture it painted was striking. Population growth slowed in the majority of the nation’s counties and the District of Columbia, with nearly 8 in 10 seeing growth slow or reverse direction in 2025, and many counties already experiencing decline saw their losses accelerate.
The Census Bureau’s Population Estimates Program – the federal office responsible for tracking year-over-year changes in population at every geographic level – uses three main factors to calculate these figures: births, deaths, and migration. Net international migration, or NIM, refers to the difference between the number of people arriving in the US from abroad and those leaving the country. It has been, for many years, one of the main engines of American population growth. That engine just hit a wall.
The primary driver of the 2025 slowdown was a 54 percent decline in net international migration, from 2.7 million to 1.3 million. That single shift rippled through thousands of communities. Counties that had been propped up by steady immigrant arrivals suddenly found themselves without that cushion – and the underlying math on births and deaths wasn’t going to save them.
What the US Census Bureau March 2025 Data Actually Shows
The US Census Bureau March 2025 county population data reveals a country in the middle of a slow but significant demographic realignment. The broad headline is that population decline is no longer just a rural story. Some of the country’s most populous counties experienced the greatest impacts from lower NIM. These counties typically had more births than deaths, known as natural increase, as well as negative net domestic migration – more people moving out than moving in from other parts of the country. Coupled with reduced NIM, the result was slower growth or population decline.
statistic alone separates this report from earlier, gentler slowdowns. We’re not talking about sparsely populated counties in rural America losing a handful of residents. We’re talking about places where millions of people live – and those places are getting smaller.
Census Bureau demographer George M. Hayward explained it plainly: “The nation’s largest counties like those in the New York metro area are often international migration hubs, gaining large numbers of international migrants and losing people that move to other parts of the country via domestic migration.” When immigration drops sharply, counties that depend on that pipeline lose their safety net.
Which US Counties Are Losing the Most Population in 2025
Los Angeles County saw the largest decline of any county in the United States in 2025, according to the census data published on March 26. Nearly 54,000 people moved out of L.A. County between July 1, 2024, and July 1, 2025. That is not a rounding error. The county’s population base was listed at 10,017,414 in April 2020. By July 2025, that estimate had fallen to 9,694,934 – a decline of more than 322,000 residents over roughly five years.
The next-largest losses came from Pinellas County, Florida, which fell by 11,834 residents, and Miami-Dade County, Florida, which fell by 10,115. Orange County also appeared on the list with a decline of 8,520 residents, and San Diego County lost 5,294. Dallas County, Texas, saw its population drop by just under 3,000 between 2024 and 2025, while Kings County, New York, saw a drop of about 5,000.
The percentage-based losses tell a different side of the story. The counties seeing the largest proportional decreases included Taylor County, Florida (-2.2%), Vernon Parish, Louisiana (-2.1%), Del Norte County, California (-2%), Monroe County, Florida (-2%), and Tuolumne County, California (-1.9%). These are smaller counties where even a modest raw loss represents a meaningful chunk of the local population.
Among counties with populations of 20,000 or more, nine of the top 10 fastest-growing counties were in the South, as were 45 out of the top 50. So while the headline is about decline, the quieter story is a continued redistribution – people and growth heading South, while established urban centers in California, Florida, New York, and Tennessee feel the squeeze.
Why Are So Many US Counties Losing Population?
This isn’t one problem. It’s three overlapping ones, and they’ve been building for years.
The first is immigration. The Trump administration’s policies aimed at reduced immigration and increased enforcement and deportations resulted in a historic decline in net migration. The US went from population growth of above 1% in 2023 and 2024 to growth of just 0.3% in 2025, a drop primarily driven by the fall in immigration. Nine out of ten US counties experienced lower NIM levels between July 1, 2024, and June 30, 2025, compared to the year prior. The one in ten that did not see a drop in international migration did not see an increase either. Put simply: every single county in America either lost ground on immigration or stayed flat.
The second problem is births. In 2024, the US recorded its lowest-ever fertility rate of 1.6 births per woman, following a downward trend in fertility rates starting in the early 2000s. The replacement level – the number of births needed to keep the population steady, assuming no immigration – is 2.1 births per woman. America has been below that threshold for decades. Lead researcher Brady Hamilton, a demographer with the CDC’s National Center for Health Statistics, noted that the latest drop in general fertility from 2024 to 2025 is part of a long-running downward trend. “Since 2007, there’s been a decline in the general fertility rate in the US of 23%,” Hamilton told NPR.
The third problem is aging. By 2030, all baby boomers will be aged 65 or older. More than 11,200 Americans are turning 65 every day from 2024 through 2027. An older population means more deaths. In 2025, the number of counties with natural decrease – meaning more deaths than births – was 2,055, or 65% of all counties. That is a stunning figure. Nearly two-thirds of American counties are now losing more people to death than they are gaining through births, before migration even enters the picture.
Jennifer Van Hook, Professor of Sociology and Demography at Penn State’s Population Research Institute, put it plainly: the conditions for population decline have been in place nationally “for a while now.” The baby boom generation has entered older adulthood, driving up the number of deaths, while the birth rate continues to drop to “unprecedented lows to below-replacement levels due to big reductions in teenage childbearing and the delay or forgoing of childbearing among other women.”
The Immigration-Economy Connection Nobody Wants to Ignore
Here is where the data gets genuinely important for anyone thinking about the long-term health of the country.
According to the Congressional Budget Office, the immigration surge between 2021 and 2026 boosted total nominal gross domestic product by $1.3 trillion in 2034 alone, and by $8.9 trillion over the 2024 to 2034 period. Those are not abstract economic projections. They represent jobs, tax revenue, Social Security contributions, and housing demand. When that engine slows, the consequences play out over years, not months.
According to analysis from the Harvard Joint Center for Housing Studies, at least five large metros – Washington, Philadelphia, Miami, Boston, and Seattle – would have lost population without international immigration. With immigration now sharply reduced, those metros face potential renewed decline. This is not a future risk. It is happening right now, in real time, as the 2025 county data makes clear.
The important point the CBO drives home is the link between population and GDP. Those who prefer a less crowded America must also recognize that fewer people also mean fewer people buying groceries, eating at restaurants, buying cars, and building or renting homes. Population is not just a social statistic. It is the foundation of economic activity.
According to the CBO’s projections, starting in 2030, annual deaths will exceed annual births in the US, and net immigration will account for all population growth. That timeline just moved closer.
Where People Are Actually Moving
The data on population decline tells only half the story. The other half is about where Americans are choosing to go. Domestic migration patterns continue to redistribute the population from the largest counties to less populous ones. The shift is real, sustained, and picking up pace.
The most moved-to states in 2025 were Idaho, South Carolina, North Carolina, Tennessee, and Florida. The common thread across most of these destinations is straightforward: lower cost of living, more affordable housing, and in many cases, no state income tax. US migration trends show steady movement toward midsize cities, particularly in the lower-cost Southeastern states.
The LA wildfire disaster of early 2025 added another layer to California’s population story. The neighboring counties of Riverside and San Bernardino saw a combined increase of 21,131 residents between 2024 and 2025, according to US Census data, suggesting that some former Angelenos simply moved to more affordable ground nearby. Others went further. The greater Las Vegas area also saw a population boost of more than 21,000 people last year.
The rural pull is also strengthening. Nearly 15 million Americans moved across the country in 2025, with many opting for quieter and more affordable places to live. Cost is a major driver behind the shift, with about 88% of movers saying they’re relocating to save money, while 76% are seeking better access to outdoor lifestyles often found in rural areas.
That said, migration trends should be read with some caution. Migration patterns have slowed since 2021. Numerous factors impact the decision not to move, with continued high housing prices and uncertainty surrounding mortgage rates discouraging some Americans from making a move. The migration map is shifting, but it isn’t moving as fast as the headlines sometimes suggest.
What Rural Population Loss Means for Communities
Rural population loss – a trend baked into American demographic patterns for decades – is getting sharper. When a rural county loses residents, the effects aren’t just numerical. Hospitals close. Schools merge or shut down. Tax bases shrink. Local businesses lose customers. The people who remain often face longer drives for services that used to be nearby.
Growth across metro areas declined dramatically – on average from 1.1% between 2023 and 2024 to 0.6% between 2024 and 2025. Even in counties that are technically growing, the pace of that growth is halving. For smaller communities with tight budgets and aging infrastructure, the difference between 1.1% growth and 0.6% growth is the difference between maintaining services and cutting them.
Collectively, the 50 counties with 1 million or more people in 2025 had a net domestic migration loss of 637,634. The people leaving those large counties are going somewhere. Many are landing in midsize metros and smaller cities. But they aren’t all going to the same places. Some of the communities absorbing these movers are thriving. Others are seeing the costs of rapid growth – strained infrastructure, higher rents, and overcrowded schools – replace the problems they thought they left behind.
What the Data Doesn’t Tell You
Raw population numbers carry their own limits. The US Census Bureau’s county estimates are based on components of change – births, deaths, and migration – but they don’t capture the economic status or age distribution of those moving. A county could gain residents and still face economic strain if the new arrivals are retirees on fixed incomes rather than working-age families. A county could lose residents and still thrive if the people who leave are replaced by higher-earning households.
Births increased in 2024 over the year before, yet the fertility rate actually fell, noted Karen Guzzo, a family demographer at the University of North Carolina. The fertility rate is a statistic describing whether each generation has enough children to replace itself – about 2.1 kids per woman. It has been sliding in America for close to two decades as more women wait longer to have children or don’t have kids at all.
That nuance matters. Population numbers are a signal, not a verdict. They point toward pressures and trends that deserve attention. They don’t determine the fate of any community. What they do is give local leaders, policymakers, and residents a clear-eyed picture of where things stand – and where they’re headed if nothing changes.
Economists note that any dropoff in birth rate has very little short-term impact on the economy. It’s more of a medium-term drag. But that medium term arrives faster than most people expect. The children not born in 2015 are the workers not entering the labor force in 2033.
The Bigger Picture
The US Census Bureau March 2025 findings don’t describe a crisis. They describe a transition – one that has been underway for years, is now accelerating, and touches every kind of place from sprawling urban counties to quiet rural towns. Census Bureau reveals population decline across all 3,143 counties as a pattern, not an anomaly, and that pattern carries weight.
The conditions driving these American population changes – falling birth rates, an aging baby boom generation, and reduced immigration – are not going to reverse quickly or easily. The Congressional Budget Office has concluded that “the population of people in the US age 24 or younger is projected to decline in each of the next 30 years.” That is a 30-year headwind. Communities and policymakers who treat 2025 county population data as a one-year blip are likely to be surprised by what the next decade brings.
The places that are growing – largely smaller cities and suburbs in the South and Mountain West – are building something. Inbound migration analysis shows a trending preference for mid-sized cities that strike a balance between job opportunities and lifestyle preferences, along with affordable housing and stable economies. That preference is reshaping the American demographic map in real time. Which US counties are losing population in 2025 is one question. The more important question is what those counties do about it.
This article was created with the assistance of AI tools and reviewed by a human editor.