the yes vote there finished with 51.4 per cent . dublin dublin the people of ireland backed same - sex marriage via a popular vote . ' we woke up today to a new ireland . as the result emerged on saturday afternoon thousands of people gathered in the courtyard of dublin castle amid scenes of widespread jubilation . the catholic church , which teaches that homosexual activity is a sin , saw its dominance of irish politics collapse after a full list of results ireland has officially passed the same - sex marraige referendum with 1.2 million people voting in its favour . donegal south west was on a razor edge with 50.1 per cent voting yes , representing a margin of just 33 votes . a referendum presented simultaneously on reducing the permissible age for presidential candidates was roundly defeated . yes ' supporters crowded into the courtyard of dublin castle to watch in blistering sunshine as results trickled in from around the country were shown on a large screen .