Mauno Koivisto was elected by the electoral college on the first ballot with 167 of 301 votes. Elector turnout 86.8%; the largest list was the Social Democratic Party, with 144 electors.
On the sources. English Wikipedia's results table shows two ballots (Koivisto 145, then 167); the President's Office table and Finnish Wikipedia record a single ballot, 167 of 301, and so does this record. Turnout is Statistics Finland's figure for citizens living in Finland; counted against every citizen entitled to vote, abroad included, it was 81.3%.
President before
Urho Kekkonen
Centre Party
Elected President
Mauno Koivisto
Social Democratic Party
Decided by
167 of 301
the college, one ballot
Elector turnout
86.8%
the popular vote that chose the college
The college's vote
Votes of the 301 electors. An absolute majority wins on the first two ballots; a third ballot is a straight choice between the top two.
Mauno Koivisto
Social Democratic Party · 55.5%
167
votes
Harri Holkeri
National Coalition Party · 19.3%
58
votes
Johannes Virolainen
Centre Party · 17.6%
53
votes
Kalevi Kivistö
Finnish People's Democratic League · 3.7%
11
votes
Jan-Magnus Jansson
Swedish People's Party · 3.7%
11
votes
Helvi Sipilä
Liberals · 0.3%
1
votes
Mauno Koivisto
Social Democratic Party
16755.5%
Harri Holkeri
National Coalition Party
5819.3%
Johannes Virolainen
Centre Party
5317.6%
Kalevi Kivistö
Finnish People's Democratic League
113.7%
Jan-Magnus Jansson
Swedish People's Party
113.7%
Helvi Sipilä
Liberals
10.3%
Who filled the college
The popular vote for electors, list by list, and the electors each list won. Lists running together under one candidate are shown with their alliance.