Proper way to enter Irish locations

Legacy uses city/county/state or province/country for inputting locations.  So how do I input an Irish location.  For example I need to enter the following place:   Donemana, Parish of Doneghedy, Co. Tyrone for the year 1854.  I prefer in enter the place as it was known at the time and add notes to name changes.  I recently received help in getting a church record from someone and they sent me their mailing address which is Donemana, Strabane, United Kingdom.  I never thought that United Kingdom maybe the country instead of Ireland.  If I do it the way I'm used to, I'd enter Donemana, Tyrone, Ulster, Ireland but is this right?  When did it go from being Ireland to United Kingdom, maybe I should put Northern Ireland.