In Ireland are post offices open on St. Day?

Yes, post offices are open in Ireland on St. Patrick's Day. There are certain public holidays on which post offices in Ireland are closed, including Christmas Day (December 25), St. Stephen's Day (December 26), New Year's Day (January 1), and Good Friday. However, St. Patrick's Day (March 17) is not one of these public holidays, and therefore, post offices remain open on that day in Ireland.