electionstracker

Portugal 1999 European Parliament election

What was the result of the 1999 European Parliament election in Portugal?

Socialist Party won 12 of 25 seats with 44.5% of the vote. 39.9% 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 12 of 25 seats with 44.5% of the vote; 39.9% of registered voters cast a ballot, up 4.4 points on 1994.

  • Socialist Party 12 +2 seats 44.5% +8.5 points
  • Social Democratic Party 9 0 seats 32.2% −3.3 points
  • Unitary Democratic Coalition 0 −3 seats 10.7% −0.9 points
  • CDS – People's Party 2 −1 seat 8.4% −4.4 points
  • Left Bloc 0 1.9%
  • Portuguese Communist Party 2
  • 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 1994 European Parliament election, party by party.

Key numbers

  1. 44.5%

    Share of the vote won by Socialist Party

    It led Social Democratic Party by 12.4 points of the vote.

  2. +2 seats

    Seats gained by Socialist Party

    The largest gain in seats compared with 1994. CDS – People's Party lost 1 seat.

  3. 39.9%

    Voter turnout

    Up 4.4 points on 1994.

Seats and votes by party

PartySeats± seats%± pointsVotes
Socialist Party12+244.5+8.51,493,146
Social Democratic Party9032.2−3.31,078,528
Unitary Democratic Coalitionwith Ecology Party -- Greens and Democratic Intervention0−310.7−0.9357,671
CDS – People's Party2−18.4−4.4283,067
Left Bloc01.961,920
Portuguese Communist Party2

± is the change against the Portugal 1994 European Parliament election, party by party.

Votes by party
  • Socialist Party 1,493,146
  • Social Democratic Party 1,078,528
  • Unitary Democratic Coalition 357,671
  • CDS – People's Party 283,067
  • Left Bloc 61,920
  • Portuguese Communist Party

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?

39.9% of the 8,681,854 registered voters cast a ballot (3,467,085 ballots), up 4.4 points on 1994. 3,353,951 of them were valid votes.

How do the votes compare with the seats?

  • Socialist Party44.5% of votes48.0% of seats
  • Social Democratic Party32.2% of votes36.0% of seats
  • CDS – People's Party8.4% of votes8.0% of seats
  • Unitary Democratic Coalition10.7% of votes0.0% of seats
Each party's share of the vote (outlined) and of the seats (filled)

The Gallagher index of disproportionality is 10.2 (0 when seats follow votes exactly); the effective number of parties is 3.1 by votes and 2.7 by seats; Socialist Party led Social Democratic Party by 12.4 points of the vote.

Time and source Data as of