No. | Name [2] | Title(s) | Term start | Term finish |
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1 [3] | John Appleton | Chargé d'Affaires | January 3, 1849 | May 4, 1849 |
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2 [4] [5] | Alexander Keith McClung | Chargé d'Affaires | July 3, 1850 | 1851 |
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3 [6] [7] | Horace H. Miller | Chargé d'Affaires | December 18, 1852 | January 1854 |
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4 [8] | John W. Dana | Chargé d'Affaires Minister Resident | February 23, 1854 | March 10, 1859 |
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5 [9] | John Cotton Smith | Minister Resident | March 10, 1859 | May 1, 1861 |
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6 [10] | David K. Cartter | Minister Resident | July 28, 1861 | March 10, 1863 |
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7 [11] | Allen A. Hall | Minister Resident | September 4, 1863 | May 18, 1867 |
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8 [12] | John W. Caldwell | Minister Resident | November 2, 1868 | July 25, 1869 |
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9 [13] | Leopold Markbreit | Minister Resident | July 25, 1869 | February 12, 1873 |
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10 [14] | John T. Croxton | Minister Resident | April 9, 1873 | April 16, 1874 |
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11 [15] | Robert M. Reynolds | Minister Resident | January 30, 1875 | October 11, 1876 |
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12 [16] | Solomon Newton Pettis | Minister Resident Consul General | June 2, 1879 | October 30, 1879 |
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13 [17] | Charles Adams | Minister Resident Consul General | July 8, 1880 | August 29, 1882 |
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14 [18] | George Maney | Minister Resident Consul General | November 4, 1882 | June 1, 1883 |
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15 [19] | Richard Gibbs | Minister Resident Consul General | October 16, 1883 | September 11, 1885 |
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16 [20] | William A. Seay | Minister Resident Consul General | September 19, 1885 | April 12, 1887 |
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17 [21] | S. S. Carlisle | Minister Resident Consul General | January 17, 1888 | December 16, 1889 |
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18 [22] | Thomas H. Anderson | Minister Resident Consul General Envoy Extraordinary and Minister Plenipotentiary | December 16, 1889 | November 22, 1892 |
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19 [23] | Frederic J. Grant | Envoy Extraordinary and Minister Plenipotentiary | April 12, 1893 | October 24, 1893 |
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20 [24] | Thomas Moonlight | Envoy Extraordinary and Minister Plenipotentiary | April 14, 1894 | January 8, 1898 |
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21 [25] | George H. Bridgman | Envoy Extraordinary and Minister Plenipotentiary | July 4, 1898 | January 13, 1902 |
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22 [26] | William B. Sorsby | Envoy Extraordinary and Minister Plenipotentiary | October 4, 1902 | March 16, 1908 |
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23 [27] | James F. Stutesman | Envoy Extraordinary and Minister Plenipotentiary | September 8, 1908 | April 15, 1910 |
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24 [28] | Horace G. Knowles | Envoy Extraordinary and Minister Plenipotentiary | December 28, 1910 | August 23, 1913 |
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25 [29] | John D. O'Rear | Envoy Extraordinary and Minister Plenipotentiary | August 31, 1913 | July 14, 1918 |
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26 [30] | S. Abbot Maginnis | Envoy Extraordinary and Minister Plenipotentiary | January 14, 1920 | December 5, 1921 |
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27 [31] | Jesse S. Cottrell | Envoy Extraordinary and Minister Plenipotentiary | January 6, 1922 | January 26, 1928 |
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28 [32] | David E. Kaufman | Envoy Extraordinary and Minister Plenipotentiary | May 30, 1928 | January 10, 1929 |
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29 [33] | Edward F. Feely | Envoy Extraordinary and Minister Plenipotentiary | September 23, 1930 | September 29, 1933 |
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30 [34] | Fay A. Des Portes | Envoy Extraordinary and Minister Plenipotentiary | November 15, 1933 | May 1, 1936 |
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31 [35] | Raymond Henry Norweb | Envoy Extraordinary and Minister Plenipotentiary | August 10, 1936 | June 15, 1937 |
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32 [36] | Robert Granville Caldwell | Envoy Extraordinary and Minister Plenipotentiary | August 21, 1937 | June 23, 1939 |
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33 [37] | Douglas Jenkins | Envoy Extraordinary and Minister Plenipotentiary | October 26, 1939 | October 3, 1941 |
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34 [38] [39] | Pierre de Lagarde Boal | Ambassador Extraordinary and Plenipotentiary | May 23, 1942 | February 5, 1944 [lower-alpha 1] |
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35 [40] | Walter C. Thurston | Ambassador Extraordinary and Plenipotentiary | November 16, 1944 | January 3, 1946 |
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36 [41] | Joseph Flack | Ambassador Extraordinary and Plenipotentiary | July 15, 1946 | May 17, 1949 |
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37 [42] | Irving Florman | Ambassador Extraordinary and Plenipotentiary | February 27, 1950 | September 4, 1951 |
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38 [43] | Edward J. Sparks | Ambassador Extraordinary and Plenipotentiary | June 13, 1952 | October 29, 1954 |
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| Gerald A. Drew | Ambassador Extraordinary and Plenipotentiary | December 8, 1954 | April 6, 1957 |
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| Philip Bonsal | Ambassador Extraordinary and Plenipotentiary | May 10, 1957 | February 6, 1959 |
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| Carl W. Strom | Ambassador Extraordinary and Plenipotentiary | May 4, 1959 | May 8, 1961 |
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| Ben S. Stephansky | Ambassador Extraordinary and Plenipotentiary | June 29, 1961 | October 15, 1963 |
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| Douglas Henderson | Ambassador Extraordinary and Plenipotentiary | December 7, 1963 | August 6, 1968 |
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| Raúl Héctor Castro | Ambassador Extraordinary and Plenipotentiary | September 3, 1968 | November 3, 1969 |
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| Ernest V. Siracusa | Ambassador Extraordinary and Plenipotentiary | December 5, 1969 | July 30, 1973 |
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| William Perry Stedman, Jr. [44] | Ambassador Extraordinary and Plenipotentiary | October 3, 1973 | June 23, 1977 |
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| Paul H. Boeker | Ambassador Extraordinary and Plenipotentiary | October 26, 1977 | February 17, 1980 |
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| Marvin Weissman | Ambassador Extraordinary and Plenipotentiary | March 26, 1980 | July 17, 1980 |
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| Edwin G. Corr | Ambassador Extraordinary and Plenipotentiary | December 10, 1981 | August 9, 1985 |
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| Edward Morgan Rowell | Ambassador Extraordinary and Plenipotentiary | August 20, 1985 | January 19, 1988 |
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| Robert S. Gelbard | Ambassador Extraordinary and Plenipotentiary | October 11, 1988 | July 20, 1991 |
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| Charles R. Bowers | Ambassador Extraordinary and Plenipotentiary | August 23, 1991 | October 7, 1994 |
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| Curtis Warren Kamman | Ambassador Extraordinary and Plenipotentiary | November 16, 1994 | November 26, 1997 |
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| Donna Jean Hrinak | Ambassador Extraordinary and Plenipotentiary | January 14, 1998 | July 17, 2000 |
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| Manuel Rocha | Ambassador Extraordinary and Plenipotentiary | August 4, 2000 | April 27, 2002 |
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[45] | David N. Greenlee | Ambassador Extraordinary and Plenipotentiary | January 17, 2003 | May 10, 2006 |
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| Philip S. Goldberg | Ambassador Extraordinary and Plenipotentiary | October 13, 2006 | September 14, 2008 |
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| Krishna R. Urs | Chargé d’Affaires a.i | September 15, 2008 | June 25, 2009 |
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[46] | James Creagan | Chargé d’Affaires a.i | June 25, 2009 | August 28, 2009 |
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[47] | John S. Creamer | Chargé d’Affaires a.i | August 28, 2009 | July 13, 2012 |
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[48] | Larry L. Memmott | Chargé d’Affaires a.i | July 14, 2012 | February 28, 2014 |
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| Aruna Amirthanayagam | Chargé d’Affaires a.i | February 28, 2014 | June 8, 2014 |
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[49] | Peter M. Brennan | Chargé d’Affaires | June 8, 2014 | December 17, 2017 |
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[50] | Bruce Williamson | Chargé d’Affaires | December 20, 2017 | August 26, 2020 |
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[51] | Charisse Phillips | Chargé d’Affaires | August 26, 2020 | October 7, 2022 |
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[52] | Jarahn Hillsman | Chargé d’Affaires | October 7, 2022 | June 24, 2023 |
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[53] | Marcos Mandojana | Chargé d’Affaires | June 25, 2023 | July 17, 2023 |
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[54] | Joe Tordella | Chargé d’Affaires | July 18, 2023 | September 14, 2023 |
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[55] | Debra Hevia | Chargé d’Affaires | September 14, 2023 | Incumbent |
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