How many people live in the United States?
According to estimates from the U.S. Census Bureau, the federal statistical agency responsible for producing data about the American people and economy, the population of the United States reached 341,784,857 people in 2025. That made it the third most populous country in the world, accounting for roughly 4 percent of the global population.
Which state do most Americans live in, and what state is the least populated?
In 2025, about one in nine American residents lived in California, making it the most populous state in the United States. Its population is greater than that of the 20 least populous states and the District of Columbia combined. At the bottom of the list is Wyoming with a population of 588,753 people.
Over one-third of the US population lives in just four states — California (39,355,309), Texas (31,709,821), Florida (23,462,518), and New York (20,002,427). Ten states have populations of more than 10 million people, 24 states have more than one million residents, and five states plus the District of Columbia have fewer than one million residents.
