How has the population of each American state evolved over the last decade?

For the full, interactive visualization, click here.

The U.S. is the third most-populated country in the world, behind only two Asian giants of China and India respectively. But within the country, a lot can change in 10 years, and populations are especially mutable in nature.

As people moved in and out of certain areas for both lifestyle and economic reasons, which U.S. state populations fluctuated the most?

Drawing from the latest Census Bureau data, we look at how each state’s resident populations evolved over the past decade. But first, a blast from the past.

Population growth trends in the U.S. have been closely tied to the economic ebbs and flows experienced by the nation. In one stark example, the country’s 10-year population growth rate plummeted to just 7.3% due to the Great Depression.

This was later offset by the post-WWII “Baby Boom”, during which birth rates soared once more, bumping up the population 10-year growth rate to 18.5% in the 1950s. The Baby Boomer generation now wields the most influence over the U.S. economy and society thanks to the favorable economic conditions in which they were born.

However, U.S. population growth rates recently hit new lows—the slower pace in the 2010s is rivalling that of the 1930s. According to Brookings, there area few factors at play:

With all this in mind, how does the current landscape of the U.S. population by state look?

The U.S. experienced 7.4% population growth between 2010-2020, which equates to the addition of 22.7 million people.

An impressive one-tenth of this growth occurred in California, and it remains the most populous state, rising above 39.5 million people in 2020. The SoCal megaregion—Los Angeles and San Diego—alone contributes more than $1.4 trillion to global economic output.

*Note: U.S. total and 10-year percentage change includes District of Columbia but excludes Puerto Rico.

To see the full interactive chart, click here.

Overall, there’s been a significant shift in population towards the Sun Belt region (stretching from Southeast to Southwest), where 62% of the U.S. now resides. Let’s take a closer look at the biggest gainers and decliners over time.

Utah saw the quickest population growth rate of 18.4% in the last decade. Drawn in by strong economic prospects, net migration into the state is balancing out a decline in births. What’s interesting is that 80% of Utah’s population is concentrated in the Wasatch Front – a metro area anchored by Salt Lake City and the chain of cities and towns running north and south of Utah’s largest city.

A little further south, Texas swelled by almost 4 million residents in the last 10 years. Much of this growth took place in the “Texas Triangle”, which contains Dallas, Houston, San Antonio, and Austin. This booming region of the country contributes over $1.2 trillion to global economic output.

West Virginia lost the most people in a decade, seeing a numeric population decline of 59,278. This may be explained by an aging population—16% of West Virginians are 65 years old and above.

When territories are also taken into account, Puerto Rico saw the biggest percentage decline of 11.8%, or close to 44,000 people over 10 years. Many of them moved into the mainland, and especially into Florida, after two hurricanes hit the island in 2017.

By 2025, California will be home to five of the fastest-growing urban U.S. cities. The unstoppable growth of the tech industry in Silicon Valley is partly behind this, as many people flock to the West Coast to fill the shoes of highly skilled jobs required.

But could Silicon Valley one day lose its steam? Current and projected population growth in Texas is bolstering its tech potential too—in fact, it’s been dubbed the next “Silicon Hills”, with many tech companies from SpaceX to Oracle choosing to camp out in Austin instead.