There are six (6) counties associated with the modern political boundaries of Northern Ireland, partitioned in 1921 (effective 1922). The counties of Northern Ireland are Antrim, Armagh, Down, Fermanagh, Londonderry, and Tyrone. While Ulster had also contained Counties Down, Cavan, and Monaghan, these three (3) counties have actually become part of the Republic of Ireland 🇮🇪, with Donegal located at the northernmost point on the island and Cavan and Monaghan in the general area southeast of Fermanagh.
The county towns associated with the counties of Northern Ireland today are Antrim in Antrim, Armagh in Armagh, Downpatrick in Down, Enniskillen in Fermanagh, Coleraine in Londonderry, and Omagh in Tyrone. For the counties in the Republic of Ireland associated with Ulster, the county towns are Lifford in Donegal, Cavan in Cavan, and Monaghan in Monaghan. Though Lifford is the county town in Donegal, Letterkenny serves as the largest settlement. For Antrim, Belfast servers the role of the largest settlement, and for Down, Bangor serves the same role. Even though Coleraine is the county town for Londonderry, the largest settlement and location containing a cathedral is namesake Derry. Just a few other locations may exist within Northern Ireland of modest population size, including a few settlements crossing Irish county lines.
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