electionstracker

Portugal 2011 legislative election

What was the result of the 2011 legislative election in Portugal?

Social Democratic Party won 108 of 230 seats with 40.3% of the vote. 58.0% 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 : Social Democratic Party won 108 of 230 seats with 40.3% of the vote; 58.0% of registered voters cast a ballot, down 1.6 points on 2009.

  • Social Democratic Party 108 +27 seats 40.3% +10.3 points
  • Socialist Party 74 −23 seats 29.2% −8.5 points
  • CDS – People's Party 24 +3 seats 12.2% +1.4 points
  • Unitary Democratic Coalition 16 +1 seat 8.2% +0.1 points
  • Left Bloc 8 −8 seats 5.4% −4.7 points
  • Portuguese Workers' Communist Party 0 0 seats 1.2% +0.2 points
  • Party for Animals and Nature 0 1.1%
  • 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 2009 legislative election, party by party.

116 of 230 seats make a majority

Key numbers

  1. 40.3%

    Share of the vote won by Social Democratic Party

    Social Democratic Party won 108 of 230 seats. A majority needs 116.

  2. +27 seats

    Seats gained by Social Democratic Party

    The largest gain in seats compared with 2009. Socialist Party lost 23 seats.

  3. 58.0%

    Voter turnout

    Down 1.6 points on 2009.

Seats and votes by party

PartySeats± seats%± pointsVotes
Social Democratic Party108+2740.3+10.32,159,181
Socialist Party74−2329.2−8.51,566,347
CDS – People's Party24+312.2+1.4653,888
Unitary Democratic Coalition16+18.2+0.1441,147
Left Bloc8−85.4−4.7288,923
Portuguese Workers' Communist Party001.2+0.262,610
Party for Animals and Nature01.157,995

± is the change against the Portugal 2009 legislative election, party by party.

Votes by party
  • Social Democratic Party 2,159,181
  • Socialist Party 1,566,347
  • CDS – People's Party 653,888
  • Unitary Democratic Coalition 441,147
  • Left Bloc 288,923
  • Portuguese Workers' Communist Party 62,610
  • Party for Animals and Nature 57,995

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.

How many people voted?

58.0% of the 9,624,354 registered voters cast a ballot (5,585,054 ballots), down 1.6 points on 2009. 5,357,037 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?

  • Social Democratic Party40.3% of votes47.0% of seats
  • Socialist Party29.2% of votes32.2% of seats
  • CDS – People's Party12.2% of votes10.4% of seats
  • Unitary Democratic Coalition8.2% of votes7.0% of seats
  • Left Bloc5.4% of votes3.5% 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 3.7 by votes and 2.9 by seats; Social Democratic Party led Socialist Party by 11.1 points of the vote.

Time and source Data as of