electionstracker

Portugal 1975 legislative election

What was the result of the 1975 legislative election in Portugal?

Socialist Party won 116 of 250 seats with 40.7% of the vote. 91.7% 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 116 of 250 seats with 40.7% of the vote; 91.7% of registered voters cast a ballot.

  • Socialist Party 116 40.7%
  • Social Democratic Party 81 28.4%
  • Portuguese Communist Party 30 13.4%
  • CDS – People's Party 16 8.2%
  • Portuguese Democratic Movement 5 4.5%
  • People's Socialist Front 0 1.3%
  • Movement of Socialist Left 0 1.1%
  • Popular Democratic Union 1 0.8%
  • Seats won
  • Share of the vote
126 of 250 seats make a majority

Key numbers

  1. 40.7%

    Share of the vote won by Socialist Party

    Socialist Party won 116 of 250 seats. A majority needs 126.

  2. 91.7%

    Voter turnout

Seats and votes by party

PartySeats%Votes
Socialist Party11640.72,162,972
Social Democratic Party8128.41,507,282
Portuguese Communist Party3013.4711,935
CDS – People's Party168.2434,879
Portuguese Democratic Movement54.5236,318
People's Socialist Front01.366,307
Movement of Socialist Left01.158,248
Popular Democratic Union10.844,877
Unnamed party with one seat1
Votes by party
  • Socialist Party 2,162,972
  • Social Democratic Party 1,507,282
  • Portuguese Communist Party 711,935
  • CDS – People's Party 434,879
  • Portuguese Democratic Movement 236,318
  • People's Socialist Front 66,307
  • Movement of Socialist Left 58,248
  • Popular Democratic Union 44,877
  • Unnamed party with one seat

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?

91.7% of the 6,231,372 registered voters cast a ballot (5,711,829 ballots). 5,315,064 of them were valid votes.

How do the votes compare with the seats?

  • Socialist Party40.7% of votes46.4% of seats
  • Social Democratic Party28.4% of votes32.4% of seats
  • Portuguese Communist Party13.4% of votes12.0% of seats
  • CDS – People's Party8.2% of votes6.4% of seats
  • Portuguese Democratic Movement4.5% of votes2.0% of seats
  • Popular Democratic Union0.8% of votes0.4% 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; Socialist Party led Social Democratic Party by 12.3 points of the vote.

Time and source Data as of