The U.S. population grew by an estimated 1.8 million people, or 0.5%, in the year ending July 1, 2025, reaching 341.8 million, according to the Census Bureau's Vintage 2025 estimates.
That was half the prior year's 1.0% growth rate, when the country added 3.2 million people. Census called the latest pace the slowest since 2021.
The main change was net international migration. The estimate fell from 2.7 million to 1.3 million, a decline of 53.8%, while births and deaths changed comparatively little.
Natural change, the difference between births and deaths, was nearly 519,000. That was close to the prior year but far below levels recorded before the pandemic and during the 2000s.
All four Census regions grew, though each slowed. The South's rate dropped from 1.4% to 0.9%, and the Northeast's from 0.8% to 0.2%.
The Midwest added 244,385 residents and was the only region where every state gained population. It also posted modest positive domestic migration for the first time this decade.
South Carolina grew fastest at 1.5%, adding 79,958 residents, including a net domestic migration gain of 66,622. Idaho followed at 1.4% and North Carolina at 1.3%.
Five states lost population: California, Hawaii, New Mexico, Vermont and West Virginia. Every state and the District of Columbia recorded lower net international migration than a year earlier, though all remained positive on that measure.
Population estimates are revised as new administrative records and methods become available. Census said this release incorporated methodological improvements, so the figures are estimates rather than a final count.