Here are the Irish names of counties in the Republic of Ireland and Northern Ireland:

Antrim     Aontroim, Condae Aontroma
Armagh     Ard Mhacha, Condae Ard Mhacha
Carlow     Ceatharlach, Condae Cheatharlach
Cavan      An Cabhán, Condae an Chabháin
Clare      An Clár, Condae an Chláir
Cork       Corcaigh, Condae Chorcaí
Derry      Doire, Condae Dhoire
Donegal    Dún na nGall, Condae Dhún na nGall, Tír Chonaill, Condae Thír Chonaill
Down       An Dún, Condae an Dúin
Dublin     Áth Cliath, Condae Átha Cliath (the city is Baile Átha Cliath)
Fermanagh  Fear Manach, Condae Fhear Manach
Galway     Gaillimh, Condae na Gaillimhe
Kerry      Ciarraí, Condae Chiarraí
Kildare    Cill Dara, Condae Chill Dara
Kilkenny   Cill Chainnigh, Condae Chill Chainnigh
Laois      Laois, Condae Laoise
Leitrim    Liatroim, Condae Liatroma
Limerick   Luimneach, Condae Luimnigh
Longford   An Longfort, Condae an Longfoirt
Louth      Lú, Condae Lú
Mayo       Maigh Eo, Condae Mhaigh Eo
Meath      An Mhí, Condae na Mí
Monaghan   Muineachán, Condae Mhuineacháin
Offaly     Uíbh Fhailí, Condae Uíbh Fhailí
Roscommon  Ros Comáin, Condae Ros Comáin
Sligo      Sligeach, Condae Shligigh
Tipperary  Tiobraid Árann, Condae Thiobraid Árann
Tyrone     Tír Eoghain, Condae Thír Eoghain
Waterford  Port Láirge, Condae Phort Láirge
Westmeath  An Iarmhí, Condae na hIarmhí
Wexford    Loch Garman, Condae Loch Garman
Wicklow    Cill Mhantáin, Condae Chill Mhantáin
Here are the Irish names of provinces in Ireland:

Connaught  Connachta, Cúige Chonnacht
Leinster   Laighin, Cúige Laighean
Munster    Mumha, Cúige Mumhan
Ulster     Ulaidh, Cúige Uladhh