Click on a county for more information.
- Name
- Antrim
- Irish Name
- Aontroim
- Province
- Ulster
- County town
- Antrim
- Population (2002)
- Name
- Armagh
- Irish Name
- Árd Mhacha
- Province
- Ulster
- County town
- Armagh
- Population (2002)
- Name
- Carlow
- Irish Name
- Ceatharlach
- Province
- Leinster
- County town
- Carlow
- Population (2002)
- 46 014
- Name
- Cavan
- Irish Name
- Cabhán
- Province
- Ulster
- County town
- Cavan
- Population (2002)
- 56 546
- Name
- Clare
- Irish Name
- Clár
- Province
- Munster
- County town
- Ennis
- Population (2002)
- 103 277
- Name
- Cork
- Irish Name
- Corcaigh
- Province
- Munster
- County town
- Cork
- Population (2002)
- 447 829
- Name
- Derry
- Irish Name
- Doire
- Province
- Ulster
- County town
- Derry
- Population (2002)
- Name
- Donegal
- Irish Name
- Dún na nGall
- Province
- Ulster
- County town
- Lifford
- Population (2002)
- 137 575
- Name
- Down
- Irish Name
- Dún
- Province
- Ulster
- County town
- Downpatrick
- Population (2002)
- Name
- Dublin
- Irish Name
- Baile Átha Cliath
- Province
- Leinster
- County town
- Dublin
- Population (2002)
- 1 122 821
- Notes
- County Dublin hasn’t officially existed since 1 January 1994. It is now composed of the counties Fingal in the north, Dun Laoghaire-Rathdown in the southeast, and South Dublin in the southwest.
- Name
- Fermanagh
- Irish Name
- Fir Manach
- Province
- Ulster
- County town
- Enniskillen
- Population (2002)
- Name
- Galway
- Irish Name
- Gaillimh
- Province
- Connacht
- County town
- Galway
- Population (2002)
- 209 077
- Name
- Kerry
- Irish Name
- Ciarraí
- Province
- Munster
- County town
- Tralee
- Population (2002)
- 132 527
- Name
- Kildare
- Irish Name
- Cill Dara
- Province
- Leinster
- County town
- Naas
- Population (2002)
- 163 944
- Name
- Kilkenny
- Irish Name
- Cill Chainnigh
- Province
- Leinster
- County town
- Kilkenny
- Population (2002)
- 80 339
- Name
- Laois
- Irish Name
- Laois
- Province
- Leinster
- County town
- Portlaoise
- Population (2002)
- 58 774
- Name
- Leitrim
- Irish Name
- Liatroim
- Province
- Connacht
- County town
- Carrick-on-Shannon
- Population (2002)
- 25 799
- Notes
- Every census since 1841 showed a declining population, until 2002. The population increased by 742 people.
- Name
- Limerick
- Irish Name
- Luimneach
- Province
- Connacht
- County town
- Limerick
- Population (2002)
- 175 304
- Name
- Longford
- Irish Name
- Longfort
- Province
- Leinster
- County town
- Longford
- Population (2002)
- 31 068
- Name
- Louth
- Irish Name
- Lú
- Province
- Leinster
- County town
- Dundalk
- Population (2002)
- 101 821
- Name
- Mayo
- Irish Name
- Maigh Eo
- Province
- Connacht
- County town
- Castlebar
- Population (2002)
- 117 446
- Name
- Meath
- Irish Name
- Mí
- Province
- Leinster
- County town
- Trim
- Population (2002)
- 134 005
- Name
- Monaghan
- Irish Name
- Muineacháin
- Province
- Ulster
- County town
- Monaghan
- Population (2002)
- 52 593
- Name
- Offaly
- Irish Name
- Ua Fáilghe
- Province
- Leinster
- County town
- Tullamore
- Population (2002)
- 63 663
- Name
- Roscommon
- Irish Name
- Ros Comán
- Province
- Connacht
- County town
- Roscommon
- Population (2002)
- 53 774
- Name
- Sligo
- Irish Name
- Sligeach
- Province
- Connacht
- County town
- Sligo
- Population (2002)
- 58 200
- Name
- Tipperary
- Irish Name
- Tiobraid Arainn
- Province
- Munster
- County town
- Tipperary
- Population (2002)
- 140 131
- Name
- Tyrone
- Irish Name
- Tir Eoghain
- Province
- Ulster
- County town
- Omagh
- Population (2002)
- Name
- Waterford
- Irish Name
- Port Lairge
- Province
- Munster
- County town
- Waterford
- Population (2002)
- 101 546
- Name
- Westmeath
- Irish Name
- Iarmhí
- Province
- Leinster
- County town
- Mullingar
- Population (2002)
- 71 858
- Name
- Wexford
- Irish Name
- Loch Garman
- Province
- Leinster
- County town
- Wexford
- Population (2002)
- 116 596
- Name
- Wicklow
- Irish Name
- Cill Mhantáin
- Province
- Leinster
- County town
- Wicklow
- Population (2002)
- 114 676