That would depend on what criteria you judge "main county" by. Dublin would be the popular answer. It contains the largest city and the capital of Ireland and it has the largest population, but it is the third smallest county in Ireland. Cork is the largest county.
Dublin
The county of Limerick's main town is the city of Limerick.
Ireland does not have ZIP codes. You would write the address with the name of the person and then their street, town and county, and Ireland if posting from outside Ireland. For example: 1 Main Street Tullamore Co. Offaly Ireland.
Donegal is the name of a county in Ireland. It is also the name of the main town in the county.
The city of Dublin does not have a capital. Dublin city is the capital of Ireland and also the main city in the county of Dublin. So Dublin city is the capital of the county of Dublin and of Ireland.
The main route is from Stranraer in Scotland to Larne in County Antrim.
Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.Derry is the county and city in Northern Ireland that has 5 letters.
There is no county in Ireland called Hilman.
County Longford is the fourth smallest county in Ireland.
There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.There are places called Dunmore in Ireland, but there is no county called Dunmore in Ireland.
Louth is the smallest county in Ireland and its county town is Dundalk.
It is in County Down, Northern Ireland.
Louth is the smallest county in Ireland.