Catholic Church in Ireland
In the 2016 Irish census 78.3% of the population identified as Catholic in Ireland; numbering approximately 3.7 million people. Unlike Catholics in the United States, Ireland has seen a significant decline from the 84.2% who identified as Catholic in the 2011 census.
Catholic unionist
Northern Ireland Life and Times Survey's 2014 poll results suggest that half of Northern Irish Catholics favour Northern Ireland remaining as part of the United Kingdom. The NILT results also suggest that 6% of Catholics would vote for the nominally unionist Alliance Party, but that only 1% would support any of the mainstream or 'hardline' Unionist parties. Similarly, the poll results suggested that 7% of Protestants would vote for the Alliance Party, while 1% of Protestants would vote for the moderate nationalist SDLP.