This is a list of the counties of Ireland ordered by area. 26 of the 32 counties are in the Republic of Ireland and 6 are in Northern Ireland.
| Rank | County | Area | Traditional province | Jurisdiction | Ref. | |
|---|---|---|---|---|---|---|
| (km2) | (mi2) | |||||
| 1 | Cork | 7,508 | 2,899 | Munster | Republic of Ireland | [1] |
| 2 | Galway | 6,151 | 2,375 | Connacht | Republic of Ireland | [2] |
| 3 | Mayo | 5,588 | 2,158 | Connacht | Republic of Ireland | [3] |
| 4 | Donegal | 4,860 | 1,880 | Ulster | Republic of Ireland | [4] |
| 5 | Kerry | 4,807 | 1,856 | Munster | Republic of Ireland | [5] |
| 6 | Tipperary | 4,305 | 1,662 | Munster | Republic of Ireland | [6] |
| 7 | Clare | 3,450 | 1,330 | Munster | Republic of Ireland | [7] |
| 8 | Tyrone | 3,266 | 1,261 | Ulster | Northern Ireland | [8] |
| 9 | Antrim | 3,086 | 1,192 | Ulster | Northern Ireland | [9] |
| 10 | Limerick | 2,756 | 1,064 | Munster | Republic of Ireland | [10] |
| 11 | Roscommon | 2,548 | 984 | Connacht | Republic of Ireland | [11] |
| 12 | Down | 2,489 | 961 | Ulster | Northern Ireland | [9] |
| 13 | Wexford | 2,367 | 914 | Leinster | Republic of Ireland | [12] |
| 14 | Meath | 2,342 | 904 | Leinster | Republic of Ireland | [13] |
| 15 | Londonderry | 2,118 | 818 | Ulster | Northern Ireland | [9] |
| 16 | Kilkenny | 2,073 | 800 | Leinster | Republic of Ireland | [14] |
| 17 | Wicklow | 2,027 | 783 | Leinster | Republic of Ireland | [15] |
| 18 | Offaly | 2,001 | 773 | Leinster | Republic of Ireland | [16] |
| 19 | Cavan | 1,932 | 746 | Ulster | Republic of Ireland | [17] |
| 20 | Waterford | 1,858 | 717 | Munster | Republic of Ireland | [18] |
| 21 | Westmeath | 1,840 | 710 | Leinster | Republic of Ireland | [19] |
| 22 | Sligo | 1,838 | 710 | Connacht | Republic of Ireland | [20] |
| 23 | Laois | 1,720 | 660 | Leinster | Republic of Ireland | [21] |
| 24 | Kildare | 1,695 | 654 | Leinster | Republic of Ireland | [22] |
| 25 | Fermanagh | 1,691 | 653 | Ulster | Northern Ireland | [23] |
| 26 | Leitrim | 1,589 | 614 | Connacht | Republic of Ireland | [24] |
| 27 | Armagh | 1,327 | 512 | Ulster | Northern Ireland | [9] |
| 28 | Monaghan | 1,295 | 500 | Ulster | Republic of Ireland | [25] |
| 29 | Longford | 1,091 | 421 | Leinster | Republic of Ireland | [26] |
| 30 | Dublin | 922 | 356 | Leinster | Republic of Ireland | [27] |
| 31 | Carlow | 897 | 346 | Leinster | Republic of Ireland | [28] |
| 32 | Louth | 826 | 319 | Leinster | Republic of Ireland | [29] |
| Total | Ireland | 84,421 | 32,595 | |||
Area (Cork County: 7,467.91 km2 / Cork City: 39.61 km2