Census demographers estimated there would be 317,297,938 U.S. residents on Wednesday, Jan. 1. That was an increase of 2,218,622 since Jan. 1, 2013.
The census predicted a total world population of 7,137,577,750 on Jan. 1, up 77,630,563. India led the world with 15.6 million new residents, followed by China, Nigeria, Pakistan and Ethiopia.
In the United States, there is expected to be a birth every 8 seconds in January and a death every 12. Globally, 4.3 births and 1.8 deaths are expected every second.
William Frey, a demographer at the Brookings Institution in Washington, told the New York Times the growth in the U.S. population is the lowest in 70 years.
"The census projections to 2060 have us going down to half a percent because we're an older population, and aging populations don't grow so much," Frey said. "If we have very sharp declines in growth, that takes a bite out of the economy."
California, Texas and New York remain the three most populous states, although Florida is likely to move into the No. 3 spot this year, the Times said. Texas, California and Florida were the fastest-growing states, with 387,397 more Texans, 332,643 more Californians and 232,111 more Floridians.
While states in the Northeast and Midwest gained about .5 percent, those in the South and West averaged almost 1 percent increases in population.