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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. Non-traditional administrative counties are indicated by a cream-coloured background.

For a more detailed analysis of current and historical Irish populations in the Republic of Ireland, see Irish population analysis. The population of the six counties of Northern Ireland as of 2021 is 1,903,100^[1] which would mean a total population on the island of Ireland as of 2022 of approximately 7,052,314.

Data source (as of June 2023):

Taken from latest census data for the Republic of Ireland^[2] and Northern Ireland.^[3]
Population data for counties in the Republic of Ireland is based on data from the 2022 census.
Population data for counties in Northern Ireland is based on the 2021 census.
The previous census for the Republic of Ireland was taken in 2016, the previous census for Northern Ireland was taken in 2011.
Density updated as of 2021 for Northern Ireland and 2022 for the Republic of Ireland.

Rank	County	Population	Density		Province	Change since previous census	Change per year
Rank	County	Population	per km²	per sq mi	Province	Change since previous census	Change per year
1	Dublin	1,458,154	1,581.5	4,096	Leinster	7.7%	1.28%
2	Antrim	651,321	211.1	547	Ulster	5.1%	0.51%
3	Cork	584,156	77.5	201	Munster	7.1%	1.18%
4	Down	553,261	222.3	576	Ulster	3.9%	0.39%
–	Fingal	330,506	724.8	1,877	Leinster	11.2%	1.86%
–	South Dublin	301,705	1,354.5	3,508	Leinster	7.5%	1.25%
5	Galway	277,737	45.1	117	Connacht	7.1%	1.18%
6	Londonderry	252,231	119.1	308	Ulster	2.0%	0.20%
7	Kildare	247,774	146.2	379	Leinster	11.0%	1.83%
–	Dún Laoghaire–Rathdown	233,860	1,859.0	4,815	Leinster	7.1%	1.18%
8	Meath	220,826	94.3	244	Leinster	12.9%	2.15%
9	Limerick	209,536	76.0	197	Munster	5.4%	0.9%
10	Armagh	194,394	146.5	379	Ulster	10.1%	1.01%
11	Tyrone	188,383	57.6	149	Ulster	5.5%	0.55%
12	Tipperary	167,895	39.0	101	Munster	5.1%	0.85%
13	Donegal	167,084	34.4	89	Ulster	4.5%	0.75%
14	Wexford	163,919	69.3	179	Leinster	9.2%	1.53%
15	Kerry	156,458	32.5	84	Munster	5.1%	0.85%
16	Wicklow	155,851	76.9	199	Leinster	9.2%	1.53%
17	Louth	139,703	169.1	438	Leinster	7.9%	1.31%
18	Mayo	137,970	24.7	64	Connacht	5.2%	0.87%
19	Clare	127,938	37.1	96	Munster	7.2%	1.2%
20	Waterford	127,363	68.6	178	Munster	9.4%	1.57%
21	Kilkenny	104,160	50.2	130	Leinster	4.5%	0.75%
22	Westmeath	96,221	52.3	135	Leinster	8.0%	1.33%
23	Laois	91,877	53.4	138	Leinster	8.2%	1.37%
24	Offaly	83,150	41.6	108	Leinster	6.0%	1.0%
25	Cavan	81,704	42.3	110	Ulster	6.6%	1.1%
26	Roscommon	70,259	27.6	71	Connacht	8.4%	1.4%
27	Sligo	70,198	38.2	99	Connacht	6.5%	1.08%
28	Monaghan	65,288	50.4	131	Ulster	5.6%	0.93%
29	Fermanagh	63,585	37.6	97	Ulster	3.8%	0.38%
30	Carlow	61,968	69.1	179	Leinster	8.8%	1.47%
31	Longford	46,751	42.9	111	Leinster	14.1%	2.35%
32	Leitrim	35,199	21.9	57	Connacht	9.5%	1.58%
Total	Island of Ireland	7,052,314	83.5	216	—
Average	Island of Ireland	220,385	—	—	—			—

Notes

The populations of Dublin, Cork, Galway, Limerick and Waterford cities are included with the respective traditional counties. For a list of these cities and their suburbs by population see, List of urban areas in the Republic of Ireland. For more information on city status, see City status in Ireland.

References

^ "Archived copy" (PDF). Archived from the original (PDF) on 24 December 2012. Retrieved 16 December 2014.{{cite web}}: CS1 maint: archived copy as title (link) NISRA Key Report, 2011
^ "Census 2022 - Summary Results - FY003A- Population". 30 May 2023. Retrieved 3 June 2023.
^ "County". NISRA. Retrieved 17 August 2023.