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.
Roman Catholic Diocese of Down and Connor
The territorial remit of the diocese includes much of counties Antrim and Down, including the cities of Belfast and Lisburn and the large towns Antrim, Ballymena, Bangor, Carrickfergus, Downpatrick, Holywood, Larne and Newtownards. The population of the diocese is about one million, of which approximately 30% are Roman Catholic. The diocese is Ireland's second largest in terms of population (after the Archdiocese of Dublin).