electionstracker

Finland 1966 parliamentary election

What was the result of the 1966 parliamentary election in Finland?

Social Democratic Party of Finland won 55 of 200 seats with 27.2% of the vote. 84.9% of registered voters cast a ballot.

  • Finland
  • Held:
  • Final result
  • ParlGov, read 5 October 2026

Which party won the most seats?

Final results from ParlGov, read : Social Democratic Party of Finland won 55 of 200 seats with 27.2% of the vote; 84.9% of registered voters cast a ballot, down 0.2 points on 1962.

  • Social Democratic Party of Finland 55 +17 seats 27.2% +7.7 points
  • Centre Party 49 −4 seats 21.2% −1.8 points
  • Democratic Union / Left Alliance 41 −6 seats 21.2% −0.8 points
  • National Coalition Party 26 −6 seats 13.8% −1.2 points
  • National Progressive Party / [Finnish] Liberal People's Party 9 −4 seats 6.5% +0.2 points
  • Swedish People's Party of Finland 11 −2 seats 5.7% −0.4 points
  • Social Democratic Union of Workers and Smallholders 7 +5 seats 2.6% −1.8 points
  • Finnish Party / True Finns 1 +1 seat 1.0% −1.2 points
  • Åland Coalition 1 0 seats 0.3% 0.0 points
  • 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 Finland 1962 parliamentary election, party by party.

101 of 200 seats make a majority

Key numbers

  1. 27.2%

    Share of the vote won by Social Democratic Party of Finland

    Social Democratic Party of Finland won 55 of 200 seats. A majority needs 101.

  2. +17 seats

    Seats gained by Social Democratic Party of Finland

    The largest gain in seats compared with 1962. Democratic Union / Left Alliance lost 6 seats.

  3. 84.9%

    Voter turnout

    Down 0.2 points on 1962.

Seats and votes by party

PartySeats± seats%± pointsVotes
Social Democratic Party of Finland55+1727.2+7.7645,339
Centre Party49−421.2−1.8503,047
Democratic Union / Left Alliance41−621.2−0.8502,374
National Coalition Party26−613.8−1.2326,928
National Progressive Party / [Finnish] Liberal People's Party9−46.5+0.2153,259
Swedish People's Party of Finland11−25.7−0.4134,831
Social Democratic Union of Workers and Smallholders7+52.6−1.861,274
Finnish Party / True Finns1+11.0−1.224,351
Christian Democrats00.510,646
Åland Coalition100.30.07,118

± is the change against the Finland 1962 parliamentary election, party by party.

Votes by party
  • Social Democratic Party of Finland 645,339
  • Centre Party 503,047
  • Democratic Union / Left Alliance 502,374
  • National Coalition Party 326,928
  • National Progressive Party / [Finnish] Liberal People's Party 153,259
  • Swedish People's Party of Finland 134,831
  • Social Democratic Union of Workers and Smallholders 61,274
  • Finnish Party / True Finns 24,351
  • Christian Democrats 10,646
  • Åland Coalition 7,118

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?

84.9% of the 2,800,461 registered voters cast a ballot (2,378,583 ballots), down 0.2 points on 1962. 2,370,046 of them were valid votes.

How do the votes compare with the seats?

  • Social Democratic Party of Finland27.2% of votes27.5% of seats
  • Centre Party21.2% of votes24.5% of seats
  • Democratic Union / Left Alliance21.2% of votes20.5% of seats
  • National Coalition Party13.8% of votes13.0% of seats
  • Swedish People's Party of Finland5.7% of votes5.5% of seats
  • National Progressive Party / [Finnish] Liberal People's Party6.5% of votes4.5% of seats
  • Social Democratic Union of Workers and Smallholders2.6% of votes3.5% of seats
  • Finnish Party / True Finns1.0% of votes0.5% of seats
  • Åland Coalition0.3% of votes0.5% of seats
Each party's share of the vote (outlined) and of the seats (filled)

The Gallagher index of disproportionality is 3.0 (0 when seats follow votes exactly); the effective number of parties is 5.2 by votes and 5.0 by seats; Social Democratic Party of Finland led Centre Party by 6.0 points of the vote.

Time and source Data as of