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| YEAR | DATE | EVENT | GOVERNOR |
| 1898 | 25 july | U.S. colony | Nelson A. Miles |
| 1898 | 21 october | John Ruller Brooke | |
| 1898 | 9 december | Guy Vernor Henry | |
| 1899 | 9 may | George Whitefield Davis | |
| 1900 | 1 may | Charles Herbert Allen | |
| 1901 | 15 september | William Henry Hunt | |
| 1904 | 4 july | Beekman Winthrop | |
| 1907 | 18 april | Regis Henry Prost | |
| 1909 | 6 november | George Radcliffe Colton | |
| 1913 | 15 november | Arthur Yager | |
| 1917 | 2 march | U.S. territory | |
| 1921 | may | José E. Benedicto | |
| 1921 | 15 may | Emmet Montgomery Reily | |
| 1923 | Juan Bernardo Huyke | ||
| 1923 | 16 april | Horace Mann Towner | |
| 1927 | U.S. self governing territory | ||
| 1929 | James R. Beverly (I) | ||
| 1929 | 9 september | Theodore Roosevelt, Jr. | |
| 1932 | january | James R. Beverly (II) | |
| 1933 | july | Robert Hayes Gore | |
| 1934 | january | Benjamin Jason Horton | |
| 1934 | 20 february | Blanton C. Winship | |
| 1939 | José E. Colón | ||
| 1939 | 11 september | William Daniel Leahy | |
| 1940 | november | José Miguel Gallardo (I) | |
| 1941 | 6 june | Guy J. Swope | |
| 1941 | 24 july | José Miguel Gallardo (II) | |
| 1941 | september | Rexford Guy Tugwell | |
| 1946 | 3 september | Jesús Toribio Piñero | |
| 1949 | 2 january | Luis Muñoz Marín | |
| 1952 | 25 july | Associated state to U.S. | |
| 1965 | 4 january | Roberto Sánchez Vilella | |
| 1969 | 4 january | Luis Alberto Ferré | |
| 1973 | 2 january | Rafael Hernández Colón (I) | |
| 1977 | 2 january | Carlos Romero Barceló | |
| 1985 | 2 january | Rafael Hernández Colón (II) | |
| 1993 | 2 january | Pedro Rosselló (I) | |
| 2001 | 2 january | Sila María Calderón | |
| 2005 | 2 january | Aníbal Acevedo Vilá | |
| 2009 | 2 january | Luis Fortuño | |
| 2013 | 2 january | Alejandro García Padilla | |
| 2017 | 2 january | Ricardo Rosselló (II) | |
| 2019 | 7 august | Wanda Vázquez | |
| 2021 | 2 january | Pedro Pierluisi |