This is a list of counties of Ireland ordered by population. Counties in the Republic of Ireland are shown in normal type, while those in Northern Ireland are listed in italic type. See also the list of Irish counties by area.
Data source/age (as-of July 2011):
| Rank | County | Change since previous census |
Population | Density (/ km²) | Province |
|---|---|---|---|---|---|
| 1 | Dublin | 0 | 1,270,603 | 1378.1 | Leinster |
| 2 | Antrim | 0 | 616,384 | 202.4 [1] | Ulster |
| 3 | Cork | 1 | 518,128 | 69.0 | Munster |
| 4 | Down | 1 | 489,588 | 199.8 [2] | Ulster |
| 5 | Galway | 0 | 250,541 | 40.7 | Connacht |
| 6 | Londonderry | 0 | 211,669 | 102.1 | Ulster |
| 7 | Kildare | 0 | 209,955 | 123.8 | Leinster |
| 8 | Limerick | 0 | 191,306 | 69.4 | Munster |
| 9 | Meath | 0 | 184,034 | 78.5 | Leinster |
| 10 | Donegal | 2 | 160,927 | 32.9 | Ulster |
| 11 | Tipperary | 0 | 158,652 | 36.8 | Munster |
| 12 | Tyrone | 2 | 158,460 | 50.2 | Ulster |
| 13 | Wexford | 2 | 145,273 | 61.2 | Leinster |
| 14 | Kerry | 1 | 145,048 | 30.1 | Munster |
| 15 | Wicklow | 1 | 136,448 | 67.4 | Leinster |
| 16 | Mayo | 1 | 130,552 | 23.3 | Connacht |
| 17 | Armagh | 3 | 126,803 | 101.1 | Ulster |
| 18 | Louth | 0 | 122,808 | 148.7 | Leinster |
| 19 | Clare | 0 | 116,885 | 33.8 | Munster |
| 20 | Waterford | 0 | 113,707 | 61.2 | Munster |
| 21 | Kilkenny | 0 | 95,360 | 46.0 | Leinster |
| 22 | Westmeath | 0 | 85,961 | 46.7 | Leinster |
| 23 | Laois | 1 | 80,458 | 46.8 | Leinster |
| 24 | Offaly | 1 | 76,806 | 38.3 | Leinster |
| 25 | Cavan | 0 | 72,874 | 37.7 | Ulster |
| 26 | Sligo | 0 | 65,270 | 35.5 | Connacht |
| 27 | Roscommon | 0 | 63,898 | 25.0 | Connacht |
| 28 | Monaghan | 1 | 60,495 | 46.7 | Ulster |
| 29 | Fermanagh | 1 | 57,527 | 34.0 | Ulster |
| 30 | Carlow | 0 | 54,532 | 60.8 | Leinster |
| 31 | Longford | 0 | 38,970 | 35.7 | Leinster |
| 32 | Leitrim | 0 | 31,778 | 19.9 | Connacht |
| Average | 195,053 | ||||
| Total | Ireland | 6,241,700 | 73.9 |
Taken from latest Census Data for Northern Ireland and the Republic of Ireland.
For a more detailed analysis of current and historical Irish populations in the Republic of Ireland, see Irish Population Analysis.