Ireland has four provinces:
Leinster: East part of the island including counties Carlow, Dublin, Wexford, Wicklow, Louth, Kildare, Meath, Westmeath, Kilkenny, Laois, Offaly, Longford.
Munster: South part of the island including counties Clare, Cork, Kerry, Limerick, Tipperary, Waterford.
Connacht: West part of the island including counties Galway, Leitrim, Mayo, Roscommon, Sligo.
Ulster: North part of the island including counties Cavan, Donegal and Monaghan in the Republic of Ireland and counties Antrim, Armagh, Down, Derry, Fermanagh, Tyrone.
Use the menu on the right, to read more about each county.
Not even the Irishcare to strictly use it that way, you are more likely to hear South Dublin county than County South Dublin. Linda Churchill there is a village called Churchill in Donegal but I think the name came simply because there was a church on the hill where the village is now.
To M. J. You should ask the Americans, they made the inversion.
there is a book written long time ago about the Churchill family and I can not remember the county in the book It was called the Churchills of something county
In North America a county is known as (name-of-county) county, whereas in Ireland such is named county (name-of-county.) Why this inversion?