United States data are based on official estimates and projections. All population estimates and projections are for the resident population. Population estimates for 2000-2012 are consistent with the 2010 Census. Population data in the IDB for 2013-2050 are based on the 2012 National Projections, Middle Series. The U.S. population components shown in the IDB for 2000-2050 may not match the official population components for the United States, due to differences in how they are displayed (calendar year versus midyear-to-midyear estimates). Revised official population estimates are released each year (www.census.gov/popest). Therefore, the U.S. population estimates (official compared with IDB) may not match due to differences in the timing of their release.
Source Information: United States