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The political party strength in Puerto Rico has been held by different political parties in the history of Puerto Rico. Today, only two parties hold a significant political strength, namely:
Other parties also hold a minority of the popular vote, namely:
At the national level residents of Puerto Rico also have local chapters affiliated with the different political parties in the United States, being the Democratic Party and the Republican Party the local affiliations with significant representation in the island.
Historical data
The following table indicates the party of elected officials in the United States insular area of Puerto Rico after 1898:
The table also indicates the historical party composition in the territorial or Commonwealth:
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.