Parliament is bicameral and is located in San Juan.
The Senate consists of 27 members, 2 per electoral district, and 11 elected according to the different districts proportion of population. Two extra seats are granted in each house to the opposition, if necessary, to limit any partys control to two-thirds. The Chamber of Representatives consists of 53 members, one per electoral district and 11 elected proportionally. Legislators are popularly elected to four-year terms.
1952-1965 Luis Muñoz Marín
1965-1969 Roberto Sánchez Vilella
1969-1973 Luis Alberto Ferré Aguayo
1973-1977 Rafael Hernández Colón
1977-1980 Carlos Antonio Romero Barceló
1980-1980 Luis Muñoz Marín
1980-1985 Carlos Antonio Romero Barceló
1985-1993 Rafael Hernández Colón
1993-1997 Pedro Juan Rosselló González
1997-1997 Roberto Sánchez Vilella
1997-2001 Pedro Juan Rosselló González
2001-2005 Sila María Calderón Serra
2005-2009 Aníbal Acevedo Vilá
2009 now Luis Guillermo Fortuño Burset