electionstracker

Portugal 1999 legislative election

What was the result of the 1999 legislative election in Portugal?

Socialist Party won 115 of 230 seats with 45.0% of the vote. 61.1% 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 115 of 230 seats with 45.0% of the vote; 61.1% of registered voters cast a ballot, down 5.2 points on 1995.

  • Socialist Party 115 +3 seats 45.0% +0.3 points
  • Social Democratic Party 81 −7 seats 33.0% −1.8 points
  • Unitary Democratic Coalition 0 0 seats 9.2% +0.4 points
  • CDS – People's Party 15 0 seats 8.5% −0.7 points
  • Left Bloc 2 2.5%
  • Portuguese Workers' Communist Party 0 0 seats 0.8% 0.0 points
  • Portuguese Communist Party 15 +2 seats
  • Ecology Party -- Greens 2 0 seats
  • 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 1995 legislative election, party by party.

116 of 230 seats make a majority

Key numbers

  1. 45.0%

    Share of the vote won by Socialist Party

    Socialist Party won 115 of 230 seats. A majority needs 116.

  2. +3 seats

    Seats gained by Socialist Party

    The largest gain in seats compared with 1995. Social Democratic Party lost 7 seats.

  3. 61.1%

    Voter turnout

    Down 5.2 points on 1995.

Seats and votes by party

PartySeats± seats%± pointsVotes
Socialist Party115+345.0+0.32,385,922
Social Democratic Party81−733.0−1.81,750,158
Unitary Democratic Coalitionwith Democratic Intervention009.2+0.4487,058
CDS – People's Party1508.5−0.7451,643
Left Bloc22.5132,333
Portuguese Workers' Communist Party000.80.040,006
Portuguese Communist Party15+2
Ecology Party -- Greens20

± is the change against the Portugal 1995 legislative election, party by party.

Votes by party
  • Socialist Party 2,385,922
  • Social Democratic Party 1,750,158
  • Unitary Democratic Coalition 487,058
  • CDS – People's Party 451,643
  • Left Bloc 132,333
  • Portuguese Workers' Communist Party 40,006
  • 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?

61.1% of the 8,864,604 registered voters cast a ballot (5,415,102 ballots), down 5.2 points on 1995. 5,306,908 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 Party45.0% of votes50.0% of seats
  • Social Democratic Party33.0% of votes35.2% of seats
  • CDS – People's Party8.5% of votes6.5% of seats
  • Left Bloc2.5% of votes0.9% of seats
  • Unitary Democratic Coalition9.2% of votes0.0% of seats
Each party's share of the vote (outlined) and of the seats (filled)

The Gallagher index of disproportionality is 9.1 (0 when seats follow votes exactly); the effective number of parties is 3.1 by votes and 2.6 by seats; Socialist Party led Social Democratic Party by 12.0 points of the vote.

Time and source Data as of