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 Church in the United Kingdom
In 2011, in total there were roughly 5.7 million Catholics in the United Kingdom; 4,155,100 in England and Wales (7.4%), 841,053 in Scotland (15.9%), and 738,033 in Northern Ireland (40.76%).