WASHINGTON - OCTOBER 17: Employees of the U.S. Census Bureau applaud as the population clock hit the 300 million mark at 7:46 a.m. October 17, 2006 in Washington DC. The population estimate is based on estimates for births, deaths and net immigration that add up to one new American per 11 seconds. Getty Images logo Getty Images 41 months ago

WASHINGTON - OCTOBER 17: Employees of the U.S. Census Bureau applaud as the population clock hit the 300 million mark at 7:46 a.m. October 17, 2006 in Washington DC. The population estimate is based on estimates for births, deaths and net immigration that add up to one new American per 11 seconds.