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.
Irish Americans
Surveys in the 1990s show that of Americans who identify themselves as "Irish", 51% said they were Protestant and 36% identified as Catholic. In the South, Protestants account for 73% of those claiming Irish origins, while Catholics account for 19%. In the North, 45% of those claiming Irish origin are Catholic, while 39% are Protestant. Many African Americans and Native Americans claim Irish Protestant or Scots-Irish ancestry.