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| ISO-3166-2 | Fips | Name of Subdivision | Capital | Population | area in km² | |
|---|---|---|---|---|---|---|
| 1 | CK | 04 | Cork | Cork | ||
| 2 | CL | 03 | Clare | 106,924 | ||
| 3 | CV | 02 | Cavan | An Cabhán | 57,473 | |
| 4 | CW | 01 | Carlow | Ceatharlach | 47,393 | |
| 5 | DB | 07 | Dublin | Baile Átha Cliath | 1,146,503 | |
| 6 | DG | 06 | Donegal | Leifear | 139,838 | |
| 7 | GW | 10 | Galway | Galway | 216,926 | |
| 8 | KD | 12 | Kildare | An Nás | 177,574 | |
| 9 | KK | 13 | Kilkenny | Cill Chainnigh | 82,284 | |
| 10 | KR | 11 | Kerry | 134,656 | ||
| 11 | LA | 15 | Laois | Port Laoise | 60,804 | |
| 12 | LF | 18 | Longford | An Longfort | 31,308 | |
| 13 | LM | 16 | Limerick | Limerick | 179,071 | |
| 14 | LR | 14 | Leitrim | Cora Droma Rúisc | 25,895 | |
| 15 | LT | 19 | Louth | Dún Dealgan | 105,295 | |
| 16 | MG | 22 | Monaghan | 53,085 | ||
| 17 | MT | 21 | Meath | Baile Átha Troim | 144,185 | |
| 18 | MY | 20 | Mayo | 119,089 | ||
| 19 | OF | 23 | Offaly | Tullamore | 65,231 | |
| 20 | RC | 24 | Roscommon | Ros Comáin | 54,174 | |
| 21 | SL | 25 | Sligo | 58,900 | ||
| 22 | TP | 26 | Tipperary | Clonmel | ||
| 23 | WF | 27 | Waterford | Port Láirge | 104,132 | |
| 24 | WK | 31 | Wicklow | Cill Mhantáin | 119,873 | |
| 25 | WM | 29 | Westmeath | 75,298 | ||
| 26 | WX | 30 | Wexford | Loch Garman | 121,122 |
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