Answer:
There are 26 counties in the Republic of Ireland, once known as the Irish Free State. They are:
Donegal
Cavan
Monaghan
Carlow
Kildare
Meath
Longford
Westmeath
Louth
Mayo
Roscommon
Leitrim
Wicklow
Sligo
Tipperary
Dublin
Cork
Kerry
Limerick
Kilkenny
Wexford
Clare
Laois
Galway
Waterford
Offaly
The other six counties, making up Northern Ireland are:
Fermanagh
Antrim
Tyrone
Down
Armagh
Derry