Electoral (Amendment) Act 2005 Constituencies for the 30th Dáil Constituencies for the 30th Dáil

| No_ | Constituency | Created | Seats | Change_ |
|---|---|---|---|---|
| 01 | Carlow–Kilkenny | 1948 | 5 | none |
| 02 | Cavan–Monaghan | 1977 | 5 | none |
| 03 | Clare | 1921 | 4 | none |
| 04 | Cork East | 1981 | 4 | none |
| 05 | Cork North–Central | 1981 | 4 | minus 1 |
| 06 | Cork North–West | 1981 | 3 | none |
| 07 | Cork South–Central | 1981 | 5 | none |
| 08 | Cork South–West | 1961 | 3 | none |
| 09 | Donegal North–East | 1981 | 3 | none |
| 10 | Donegal South–West | 1981 | 3 | none |
| 11 | Dublin Central | 1981 | 4 | none |
| 12 | Dublin Mid–West | 2002 | 4 | plus 1 |
| 13 | Dublin North | 1981 | 4 | none |
| 14 | Dublin North–Central | 1948 | 3 | minus 1 |
| 15 | Dublin North–East | 1981 | 3 | none |
| 16 | Dublin North–West | 1981 | 3 | none |