USA Total: 150,697,361

Actual:
1790 | 1800 | 1810 | 1820 | 1830 | 1840 | 1850 | 1860 | 1870 | 1880 | 1890 | 1900 | 1910 | 1920 | 1930 | 1940 | 1950 | 1960 | 1970 | 1980 | 1990 | 2000

Estimates:
2010 | 2020 | 2030 | 2040 | 2050 | 2060 | 2070 | 2080 | 2090

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Source: www.census.gov, for example http://www.census.gov/acs/www/Products/Profiles/Single/2002/ACS/Tabular/010/01000US1.htm