Fuente: “Parties and Elections in Europe“
| Party | Ideology | Affiliation | 2009 | Seats | 2005 | Seats | |
 |
Partido Socialista (PS)  Socialist Party |
Social democracy – |
PES, SI 1973 |
36,6% | 96 | 45,1% | 121 |
 |
Partido Social Democrata (PPD-PSD) Social Democratic Party |
Liberal conservatism; Christian democracy | EPP, CDI 1974 |
29,1% | 78 | 28,7% | 75 |
 |
Partido Popular (CDS-PP) People’s Party |
Conservatism; Christian democracy – |
EPP, IDU 1974 |
10,5% | 21 | 7,3% | 12 |
 |
Bloco de Esquerda (BE) Left Bloc |
Democratic socialism; Anti-capitalism | EL, EACL 1999 |
9,9% | 16 | 6,4% | 8 |
 |
Coligação Democrática Unitária (CDU) Democratic Unity Coalition |
– – |
– – |
7,9% | 15 | 7,6% | 14 |
 |
Partido Comunista Português (PCP) Portuguese Communist Party |
Communism; Marxism-Leninism – |
– 1921 |
– | – | – | 12 |
 |
Partido Ecologista Os Verdes (PEV) Ecological Party The Greens |
Green politics – |
EGP, GG 1982 |
– | – | – | 2 |
| Abroad constituencies (undeclared) | – | – | – | 4 | – | – | |
| Others | – | – | 6,0% | – | 4,9% | – | |
| Total | – | – | – | 230 | – | 230 | |
| Turnout | – | – | 60,6% | 65,0% | |||
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