electionstracker

Portugal 1991 legislative election

What was the result of the 1991 legislative election in Portugal?

Social Democratic Party won 135 of 230 seats with 51.6% of the vote. 67.8% 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 135 of 230 seats with 51.6% of the vote; 67.8% of registered voters cast a ballot, down 3.8 points on 1987.

  • Social Democratic Party 135 −13 seats 51.6% +0.3 points
  • Socialist Party 72 +12 seats 29.7% +7.0 points
  • Unitary Democratic Coalition 0 0 seats 9.0% −3.4 points
  • CDS – People's Party 5 +1 seat 4.5% 0.0 points
  • National Solidarity Party 1 1.7%
  • Revolutionary Socialist Party 0 1.1%
  • Portuguese Communist Party 15 −13 seats
  • Ecology Party -- Greens 2 +1 seat
  • 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 1987 legislative election, party by party.

116 of 230 seats make a majority

Key numbers

  1. 51.6%

    Share of the vote won by Social Democratic Party

    Social Democratic Party won 135 of 230 seats. A majority needs 116.

  2. +12 seats

    Seats gained by Socialist Party

    The largest gain in seats compared with 1987. Portuguese Communist Party lost 13 seats.

  3. 67.8%

    Voter turnout

    Down 3.8 points on 1987.

Seats and votes by party

PartySeats± seats%± pointsVotes
Social Democratic Party135−1351.6+0.32,902,351
Socialist Party72+1229.7+7.01,670,758
Unitary Democratic Coalitionwith Democratic Intervention009.0−3.4504,583
CDS – People's Party5+14.50.0254,317
National Solidarity Party11.796,096
Revolutionary Socialist Party01.164,159
Portuguese Communist Party15−13
Ecology Party -- Greens2+1

± is the change against the Portugal 1987 legislative election, party by party.

Votes by party
  • Social Democratic Party 2,902,351
  • Socialist Party 1,670,758
  • Unitary Democratic Coalition 504,583
  • CDS – People's Party 254,317
  • National Solidarity Party 96,096
  • Revolutionary Socialist Party 64,159
  • Portuguese Communist Party
  • Ecology Party -- Greens

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?

67.8% of the 8,462,357 registered voters cast a ballot (5,735,431 ballots), down 3.8 points on 1987. 5,624,759 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 Party51.6% of votes58.7% of seats
  • Socialist Party29.7% of votes31.3% of seats
  • CDS – People's Party4.5% of votes2.2% of seats
  • National Solidarity Party1.7% of votes0.4% of seats
  • Unitary Democratic Coalition9.0% of votes0.0% of seats
Each party's share of the vote (outlined) and of the seats (filled)

The Gallagher index of disproportionality is 9.6 (0 when seats follow votes exactly); the effective number of parties is 2.7 by votes and 2.2 by seats; Social Democratic Party led Socialist Party by 21.9 points of the vote.

Time and source Data as of