The following table indicates the party of elected officials in the United States insular area of Puerto Rico after 1898:
- Governor
The table also indicates the historical party composition in the territorial or Commonwealth:
- Senate
- House of Representatives
- Territory delegation to the U.S. House of Representatives
The Puerto Rican parties are as follows: Alianza Puertorriqueña (AP), Republican-Socialist Coalition (C), Christian Action (CA), Estadista (E), Estadista Puertorriqueño (EP), Estadista Republicano (ER), Puerto Rican Independence (PIP), Liberal Party (L), Nonpartisan (NP), Partido Histórico (PH), New Progressive (PNP), Popular Democratic (PPD), Republicano Puertorriqueño (RP), Socialist (S), Socialista-Constitucional (SC), Union of Puerto Rico (U), Puerto Rican Socialist Party (PSP), Puerto Rican Union Party (PUP) and Unión Republicana-Progresista (URP). Elected officials' United States party affiliations are as follows: Democratic (D) and Republican (R).
For a particular year, the noted partisan composition is that which either took office during that year or which maintained the office throughout the entire year. Only changes made outside of regularly scheduled elections are noted as affecting the partisan composition during a particular year. Shading is determined by the final result of any mid-cycle changes in partisan affiliation.
| Year | Executive office | Legislative Assembly | U.S. House | |
|---|---|---|---|---|
| Governor | Senate | House | ||
| 1901 | appointed under United States colonial administration | unknown | Federico Degetau (RP/R) | |
| 1902 | ||||
| 1903 | ||||
| 1904 | ||||
| 1905 | U majority | Tulio Larrinaga (U) | ||
| 1906 | ||||
| 1907 | ||||
| 1908 | ||||
| 1909 | ||||
| 1910 | ||||
| 1911 | Luis Muñoz Rivera (U) | |||
| 1912 | ||||
| 1913 | ||||
| 1914 | ||||
| 1915 | ||||
| 1916 | ||||
| 1917 | 13U, 5RP, 1S | unknown | Felix Cordova Davila (U) | |
| 1918 | ||||
| 1919 | ||||
| 1920 | ||||
| 1921 | 15U, 3RP, 1S | |||
| 1922 | ||||
| 1923 | ||||
| 1924 | ||||
| 1925 | 17AP, 2U | |||
| 1926 | ||||
| 1927 | ||||
| 1928 | ||||
| 1929 | 11AP, 7SC, 1PH | |||
| 1930 | ||||
| 1931 | ||||
| 1932 | ||||
| José Lorenzo Pesquera (NP) | ||||
| 1933 | 14C, 5L | C majority | Santiago Iglesias (C/R) | |
| 1934 | ||||
| 1935 | ||||
| 1936 | ||||
| 1937 | ||||
| 1938 | ||||
| 1939 | Bolívar Pagán (C/R) | |||
| 1940 | ||||
| 1941 | 10PPD, 9U | PPD majority | ||
| 1942 | ||||
| 1943 | ||||
| 1944 | ||||
| 1945 | 17PPD, 1URP, 1S | Jesús T. Piñero (PPD/D) | ||
| 1946 | ||||
| Antonio Fernós-Isern (PPD/D) | ||||
| 1947 | ||||
| 1948 | ||||
| 1949 | Luis Muñoz Marín (PPD) | 17PPD, 1S, 1EP | ||
| 1950 | ||||
| 1951 | ||||
| 1952 | ||||
| 1953 | 23PPD, 5IP, 3E, 1ER | |||
| 1954 | ||||
| 1955 | ||||
| 1956 | ||||
| 1957 | 22PPD, 6ER, 3IP | |||
| 1958 | ||||
| 1959 | ||||
| 1960 | ||||
| 1961 | 23PPD, 9ER, 1CA | |||
| 1962 | ||||
| 1963 | ||||
| 1964 | ||||
| 1965 | Roberto Sánchez Vilella (PPD) | 23PPD, 9ER | Santiago Polanco Abreu (PPD/D) | |
| 1966 | ||||
| 1967 | ||||
| 1968 | ||||
| 1969 | Luis A. Ferré (PNP) | 15PPD, 12PNP | 28PNP, 23PPD | Jorge Luis Córdova Díaz (PNP/R) (but caucused with D in Congress) |
| 1970 | ||||
| 1971 | ||||
| 1972 | ||||
| 1973 | Rafael Hernández Colón (PPD) | 20PPD, 6PNP, 1IP | PPD majority | Jaime Benítez (PPD/D) |
| 1974 | ||||
| 1975 | ||||
| 1976 | ||||
| 1977 | Carlos Romero Barceló (PNP/R) | 14PNP, 13PPD | PNP majority | Baltasar Corrada del Río (PNP/D) (later R) |
| 1978 | ||||
| 1979 | Carlos Romero Barceló (PNP/D) | |||
| 1980 | ||||
| 1981 | 15PPD, 12PNP | PNP—PPD tie | ||
| 1982 | PNP—PPD tie | |||
| 1983 | ||||
| 1984 | ||||
| 1985 | Rafael Hernández Colón (PPD) | 18PPD, 8PNP, 1IP | PPD majority | Jaime Fuster (PPD/D) |
| 1986 | ||||
| 1987 | ||||
| 1988 | ||||
| 1989 | 18PPD, 8PNP, 1IP | |||
| 1990 | ||||
| 1991 | ||||
| 1992 | ||||
| Antonio Colorado (PPD/D) | ||||
| 1993 | Pedro Rosselló (PNP/D) | 20PNP, 8PPD, 1IP | PNP majority | Carlos Romero Barceló (PNP/D) |
| 1994 | ||||
| 1995 | ||||
| 1996 | ||||
| 1997 | 19PNP, 8PPD, 1PIP | 37PNP, 16PPD, 1PIP | ||
| 1998 | ||||
| 1999 | ||||
| 2000 | ||||
| 2001 | Sila María Calderón (PPD/D) | 19PPD, 8PNP, 1PIP | 29PPD, 21PNP, 1PIP | Aníbal Acevedo Vilá (PPD/D) |
| 2002 | ||||
| 2003 | ||||
| 2004 | ||||
| 2005 | Aníbal Acevedo Vilá (PPD/D) | 17PNP, 9PPD, 1PIP | 32PNP, 18PPD, 1PIP | Luis Fortuño (PNP/R) |
| 2006 | ||||
| 2007 | ||||
| 2008 | ||||
| 2009 | Luis Fortuño (PNP/R) | 22PNP, 9PPD | 37PNP, 17PPD | Pedro Pierluisi (PNP/D) |
| 2010 | ||||
| 2011 | ||||
| 2012 | ||||
| 2013 | Alejandro García Padilla (PPD) | 18PPD, 8PNP, 1PIP | 28PPD, 23PNP | |
| Year | Governor | Senate | House | U.S. House |
| Executive office | Legislative Assembly | |||
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