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 Europe
About 35% of the population of Europe today is Catholic, but only about a quarter of all Catholics worldwide reside in Europe. This is due in part to the movement and immigration at various times of largely Catholic European ethnic groups (such as the Irish, Italians, Poles, Portuguese, and Spaniards) to continents such as the Americas and Australia. Furthermore, Catholicism has been spread outside Europe through both historical Catholic missionary activity, especially in Latin America, and the past colonization and conversion of native people by Catholic European countries, specifically the Spanish, Portuguese, French and Belgian colonial empire, in regions such as South America, the Caribbean, Central Africa and West Africa, and Southeast Asia.