US Census Clock & Population increase since 1790 by decade

According to the U.S. Bureau of the Census, the resident population of the United States, projected to 12/06/10 at 18:23 UTC (EST+5) is 310,859,176

COMPONENT SETTINGS FOR DECEMBER 2010

One birth every..................................   7 seconds

One death every..................................  12 seconds

One international migrant (net) every............  37 seconds

Net gain of one person every.....................  13 seconds

http://www.census.gov/population/www/popclockus.html

Resident Population

The U.S. resident population includes the total number of people in the 50 states and the District of Columbia. The resident population of the United States on April 1, 2000, was 281,421,906, an increase of 13.2 percent over the 248,709,873 counted during the 1990 Census. This data will be released by the Census Bureau before December 31, 2010.

http://2010.census.gov/2010census/data/index.php