The release of the projections, an annual occurrence, took place earlier today.
From the U.S. Census:
The U.S. Census Bureau today projected the United States population will be 320,090,857 on Jan. 1, 2015.
This represents an increase of 2,334,187, or 0.73 percent, from New Year’s Day 2014, and 11,345,319, or 3.67 percent, since Census Day (April 1) 2010.
In January 2015, the U.S. is expected to experience a birth every eight seconds and one death every 12 seconds. Meanwhile, net international migration is expected to add one person to the U.S. population every 33 seconds. The combination of births, deaths and net international migration increases the U.S. population by one person every 16 seconds.
The projected world population on Jan. 1, is 7,214,958,996, an increase of 77,381,246, or 1.08 percent, from New Year’s Day 2014. During January 2015, 4.3 births and 1.8 deaths are expected worldwide every second.
See Also: U.S. Census Population Clock