| Year | Foreign-born population, in millions |
|---|---|
| 1850 | 2.2 |
| 1860 | 4.1 |
| 1870 | 5.6 |
| 1880 | 6.7 |
| 1890 | 9.2 |
| 1900 | 10.3 |
| 1910 | 13.5 |
| 1920 | 13.9 |
| 1930 | 14.2 |
| 1940 | 11.6 |
| 1950 | 10.3 |
| 1960 | 9.7 |
| 1970 | 9.6 |
| 1980 | 14.1 |
| 1990 | 19.8 |
| 2000 | 31.1 |
| 2010 | 39.9 |
| 2013 | 41.3 |
| 2014 | 42.2 |
Source: U.S. Census Bureau population estimates and Pew Research Center tabulations of 2010, 2013 and 2014 American Community Surveys (IPUMS)
