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Idaho continues to be the fastest-growing state in the nation, according to new figures released this week, with Utah not far behind as both states bucked a nationwide trend of slower population growth during the COVID-19 pandemic.

From July 2020 to July 2021, Idaho’s statewide population grew by 53,151 residents — a one-year growth rate of 2.9%, according to U.S. Census Bureau population estimates released Tuesday. The next closest states rate were Montana and Utah, both of which grew at a 1.7% clip. Montana added 18,078 residents in the same 12-month window, while Utah’s population increased by 56,291.

Census data released earlier this year showed Utah to be the fastest-growing state from 2010 to 2020, but those numbers also revealed that Idaho had overtaken the top spot by 2015.

While Idaho and Utah remained at the top for growth, the figures released this week tell different stories of how they got there.

The lion’s share of recent growth in Idaho has come through people moving in from other states. Domestic migration accounted for nearly 92% of the state’s increase for the 12 months ended July 1, with the most of the remainder coming from natural population increase (births minus deaths).

Utah also saw a majority of its growth (57%) from domestic migration, but attributed a much larger share to natural increase (41%) compared with Idaho.

The numbers for Utah, Idaho and several other western states stand in stark contrast to the nation as a whole.

Overall, U.S. population growth dipped to its lowest rate since the nation’s founding during the first year of the pandemic as the coronavirus curtailed immigration, delayed pregnancies and killed hundreds of thousands of U.S. residents.

The United States grew by only 0.1%, with an additional 392,665 added to the U.S. population from July 2020 to July 2021, bringing the nation's count to 331.8 million people.

The U.S. has been experiencing slow population growth for years but the pandemic exacerbated that trend. This past year was the first time since 1937 that the nation’s population grew by less than 1 million people.

“I was expecting low growth but nothing this low,” said William Frey, a senior fellow at the Brookings Institution's metropolitan policy program, Brookings Metro. “It tells us that this pandemic has had a huge impact on us in all kinds of ways, and now demography.”

Once there’s a handle on the pandemic, the U.S. may eventually see a decrease in deaths, but population growth likely won’t bounce back to what it has been in years past because of fewer births. That will increase the need for immigration by younger workers whose taxes can support programs such as Social Security, Frey said.

“We have an aging population and that means fewer women in child-bearing ages,” Frey said. “We see younger people putting off having children and they’re going to have fewer children.”

The decision not to have children by young families may be driven by financial worries as much, if not more, than health concerns, said Linda Kahn, a professor at New York University and lead researcher in a study that showed that almost half of New York City mothers who had been trying to become pregnant before the pandemic began in the U.S. in March 2020 stopped in the first few months of the outbreak.

“COVID really was a stress test of our whole system and how it fails to support women and families,” Kahn said. “Women were much harder hit in the pandemic. They lost their jobs at greater rates and had to give up their jobs, often to do home-schooling. The pressures on women were enormous and there’s really no safety net in the U.S.”

The population estimates are derived from calculating the number of births, deaths and migration in the U.S. For the first time, international migration surpassed natural increases that come from births outnumbering deaths. There was a net increase of nearly 245,000 residents from international migration but only about 148,000 from new births outnumbering deaths.

International migration dropped by about half from the previous year because of COVID-19 restrictions, such as borders being closed for nonessential travel and the closure of many consulates abroad where visas are issued. As recently as 2016, the U.S. had a net increase of more than 1 million international migrants.

In more than two dozen states, most notably Florida, deaths outnumbered births. Deaths exceeded births in Florida by more than 45,000 people, but the state's saving grace was a migration gain of more than 259,000 people, the nation's highest.

University of New Hampshire demographer Kenneth Johnson described the decline in the United States' natural population increase as “stunning," saying it was the smallest spread of births over deaths in more than 80 years.

“Of course most of this is COVID, but not all of it," Johnson said. “U.S. natural increase was already at a low ebb prior to COVID with the fertility rate hitting a new record low each year and deaths steadily rising due to the population aging."

Between 2020 and 2021, 33 states saw population increases, primarily through domestic migration, while 17 states and the District of Columbia lost population.

The District of Columbia lost 2.9% of its population, while New York and Illinois lost 1.6% and 0.9% of their populations, respectively. In pure numbers, California had the greatest net population loss of any state from people leaving: almost 353,000.

While the pandemic gave some people the option of working remotely, data released last month by the Census Bureau shows there was no great migration in the U.S. because of it.

Some did take advantage of the opportunity, however. Tired of the heat, hurricane threats and traffic in Houston, tech worker Heidi Krueger moved to a small town south of Knoxville, Tennessee, in September. She can see the Great Smoky Mountains from her front porch.

“Because I was working from home during the pandemic, it made it feasible to move and still keep my same job,” Krueger said. “As long as I have internet, I can still connect to our clients.”

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