The president is constitutionally required to be natural born, but foreign-born Senators need only nine years of U.S. citizenship to qualify for office.
Constitutional qualifications to be a Senator are specified in
Article I, section 3.
| Senator (State) | Senate Service | Birth Place | ||
|---|---|---|---|---|
| Armstrong, David Hartley (MO) | 1877-1879 | Canada | ||
| Baird, David (NJ) | 1918-1919 | Ireland | ||
| Baker, Edward (OR) | 1860-1861 | England | ||
| Beck, James B. (KY) | 1877-1890 | Scotland | ||
| Benjamin, Judah P. (LA) | 1853-1861 | St. Croix | ||
| Boschwitz, Rudy (MN) | 1978-1991 | Germany | ||
| Butler, Pierce (SC) | 1789-1796; 1802-1804 | Ireland | ||
| Campbell, George W. (TN) | 1811-1814; 1815-1818 | Scotland | ||
| Casserly, Eugene (CA) | 1869-1873 | Ireland | ||
| Conness, John (CA) | 1863-1869 | Ireland | ||
| Couzens, James (MI) | 1922-1936 | Canada | ||
| Davis, James J. (PA) | 1930-1945 | Wales | ||
| Dudley, Charles E. (NY) | 1829-1833 | England | ||
| Fair, James G. (NV) | 1881-1887 | Ireland | ||
| Fromentin, Eligius (LA) | 1813-1819 | France | ||
| Gallatin, Albert (PA) | not seated | Switzerland | ||
| Gallinger, Jacob H. (NH) | 1891-1918 | Canada | ||
| Gooding, Frank R. (ID) | 1921-1928 | England | ||
| Harper, William (SC) | 1826 | Antigua | ||
| Hayakawa, Sam (CA) | 1977-1983 | Canada | ||
| Hirono, Mazie (HI) | 2013-present | Japan | ||
| Hughes, William (NJ) | 1913-1918 | Ireland | ||
| Jackson, James (GA) | 1793-1795; 1801-1806 | England | ||
| Johnson, Magnus (MN) | 1923-1925 | Sweden | ||
| Jones, Charles W. (FL) | 1875-1887 | Ireland | ||
| Jones, John P. (NV) | 1873-1903 | England | ||
| Kearns, Thomas (UT) | 1901-1905 | Canada | ||
| Larrazolo, Octaviano (NM) | 1928-1929 | Mexico | ||
| Laurance, John (NY) | 1796-1800 | England | ||
| Lorimer, William (IL) | 1909-1912 | England | ||
| Lowrie, Walter (PA) | 1819-1825 | Scotland | ||
| Mallory, Stephen R. (FL) | 1851-1861 | Trinidad | ||
| Mantle, Lee (MT) | 1895-1899 | England | ||
| Martinez, Mel (FL) | 2005-2009 | Cuba | ||
| McMillan, James (MI) | 1889-1902 | Canada | ||
| Millard, Joseph H. (NE) | 1901-1907 | Canada | ||
| Morris, Robert (PA) | 1789-1795 | England | ||
| Moses, John (ND) | 1945 | Norway | ||
| Murray, James E. (MT) | 1934-1961 | Canada | ||
| Nelson, Knute (MN) | 1895-1923 | Norway | ||
| Nicholson, Samuel D. (CO) | 1921-1923 | Canada | ||
| Pasco, Samuel (FL) | 1887-1899 | England | ||
| Paterson, William (NJ) | 1789-1790 | Ireland | ||
| Patterson, Thomas M. (CO) | 1901-1907 | Ireland | ||
| Porter, Alexander (LA) | 1833-1837 | Ireland | ||
| Robertson, Edward Vivian (WY) | 1943-1949 | Wales | ||
| Schurz, Carl (MO) | 1869-1875 | Germany | ||
| Sewell, William J. (NJ) | 1881-1887; 1895-1901 | Ireland | ||
| Shields, James (IL) | 1849-1855 | Ireland | ||
| (MN) | 1858-1859 | |||
| (MO) | 1879 | |||
| Simon, Joseph (OR) | 1898-1903 | Germany | ||
| Soulé, Pierre (LA) | 1847; 1849-1853 | France | ||
| Stephenson, Isaac (WI) | 1907-1915 | Canada | ||
| Sullivan, Patrick J. (WY) | 1929-1930 | Ireland | ||
| Sutherland, George (UT) | 1905-1917 | England | ||
| Taggart, Thomas (IN) | 1916 | Ireland | ||
| Tiffin, Edward (OH) | 1807-1809 | England | ||
| Wagner, Robert F. (NY) | 1927-1949 | Germany | ||
| Walsh, Patrick (GA) | 1894-1895 | Ireland | ||
| Yulee, David L. (FL) | 1845-1851; 1855-1861 | St. Thomas | ||
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| Bennet, Michael F. (CO) | 2009-present | India | ||
| Cathcart, Charles W. (IN) | 1852-1853 | Madeira | ||
| Cruz, Rafael E.(Ted) (TX) | 2013-present | Canada | ||
| Duckworth, Tammy (IL) | 2017-present | Thailand | ||
| Herbert, Felix (RI) | 1929-1935 | Canada | ||
| McCain, John (AZ) | 1987-2018 | Panama Canal Zone | ||
| Nesmith, James W. (OR) | 1861-1867 | Canada | ||
| Oliver, George T. (PA) | 1909-1917 | Ireland | ||
| Van Hollen, Chris (MD) | 2017-present | Pakistan | ||
| Weicker, Lowell (CT) | 1971-1989 | France | ||
| Wetmore, George P. (RI) | 1895-1907; 1908-1913 | England | ||
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| Bingham, Hiram (CT) | 1924-1933 | Kingdom of Hawaii | ||
| Bouligny, Charles (LA) | 1824-1829 | Spanish Louisiana | ||
| Destréhan, Jean N. (LA) | 1812 | French Louisiana | ||
