electionstracker

Portugal 2009 legislative election

What was the result of the 2009 legislative election in Portugal?

Socialist Party won 97 of 230 seats with 37.7% of the vote. 59.7% of registered voters cast a ballot.

  • Portugal
  • Held:
  • Final result
  • ParlGov, read 5 October 2026

Which party won the most seats?

Final results from ParlGov, read : Socialist Party won 97 of 230 seats with 37.7% of the vote; 59.7% of registered voters cast a ballot, down 4.6 points on 2005.

  • Socialist Party 97 −24 seats 37.7% −8.7 points
  • Social Democratic Party 81 +6 seats 30.0% +0.4 points
  • CDS – People's Party 21 +9 seats 10.8% +3.3 points
  • Left Bloc 16 +8 seats 10.1% +3.6 points
  • Unitary Democratic Coalition 15 +15 seats 8.1% +0.3 points
  • Portuguese Workers' Communist Party 0 0 seats 1.0% +0.1 points
  • Seats won
  • Change on the previous election at the right
  • Share of the vote
  • Share at the previous election
  • Change in points at the right

Changes are against the Portugal 2005 legislative election, party by party.

116 of 230 seats make a majority

Key numbers

  1. 37.7%

    Share of the vote won by Socialist Party

    Socialist Party won 97 of 230 seats. A majority needs 116.

  2. +9 seats

    Seats gained by CDS – People's Party

    The largest gain in seats compared with 2005. Socialist Party lost 24 seats.

  3. 59.7%

    Voter turnout

    Down 4.6 points on 2005.

Seats and votes by party

PartySeats± seats%± pointsVotes
Socialist Party97−2437.7−8.72,077,238
Social Democratic Party81+630.0+0.41,653,665
CDS – People's Party21+910.8+3.3592,778
Left Bloc16+810.1+3.6557,306
Unitary Democratic Coalitionwith Democratic Intervention, Portuguese Communist Party and Ecology Party -- Greens15+158.1+0.3446,279
Portuguese Workers' Communist Party001.0+0.152,761

± is the change against the Portugal 2005 legislative election, party by party.

Votes by party
  • Socialist Party 2,077,238
  • Social Democratic Party 1,653,665
  • CDS – People's Party 592,778
  • Left Bloc 557,306
  • Unitary Democratic Coalition 446,279
  • Portuguese Workers' Communist Party 52,761

ParlGov lists parties with at least 1 percent of the vote or 2 seats, so the rows do not add up to the valid votes.

ParlGov counts an alliance's votes and seats under its first party: such a row names the allies it counts.

How many people voted?

59.7% of the 9,519,921 registered voters cast a ballot (5,681,258 ballots), down 4.6 points on 2005. 5,505,278 of them were valid votes. The lowest turnout of this kind in our data, which begins in 1975.

How do the votes compare with the seats?

  • Socialist Party37.7% of votes42.2% of seats
  • Social Democratic Party30.0% of votes35.2% of seats
  • CDS – People's Party10.8% of votes9.1% of seats
  • Left Bloc10.1% of votes7.0% of seats
  • Unitary Democratic Coalition8.1% of votes6.5% of seats
Each party's share of the vote (outlined) and of the seats (filled)

The Gallagher index of disproportionality is 5.6 (0 when seats follow votes exactly); the effective number of parties is 3.8 by votes and 3.1 by seats; Socialist Party led Social Democratic Party by 7.7 points of the vote.

Time and source Data as of