The political party strength in Puerto Rico has been held by different political parties in the history of Puerto Rico. Today, that strength is primarily held by two parties, namely: The rest of the strength is held by three minority parties

Before the 1952 Constitution

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: (AC), (AP), * (C), (E), (EP), (ER), (PIP), (L), (MUS), (NP), (PNP), (PPD), (P), (PT/PPT), (PPR), (RP), (SO), (PSP), (U), and (URP). *Coalición was an electoral coalition, not a party. 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.

After the 1952 Constitution