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Ireland - 83.1% in favour (10 May 1972)

Ireland The Tenth Amendment of the Constitution of Ireland permitted Ireland to ratify the Single European Act. It was approved by referendum on 26 May 1987. The result of the referendum was 69.9% in favour.

Ireland referendum (18 June 1992)
Result was a majority of 68.7% in favour. Turnout was 57.31%.

Two countries held referendums on the ratification of the treaty of Amsterdam: Ireland and Denmark.
Ireland referendum (22 May 1998)
Result was a majority of 61.74% in favour. Turnout was 56.2%.

Ireland - Irish referendums on Treaty of Nice
In 2001 Irish voters rejected the Treaty of Nice by 53.9%, but with only 34.8% of the electorate voting, while in 2002 they accepted the Treaty by 62.9% with 49.5% of the electorate voting.

United Kingdom The Conservative government of Edward Heath did not hold a referendum before the United Kingdom joined. Labour's manifesto for the 1974 general election included a pledge for a referendum, so after Labour won under Harold Wilson, the referendum was held on whether to remain in the Communities. The result was 67.2% in favour, with a turnout of 64.0%.