Castlebar has a population of 13,054, making it the 50th largest place we list in Ireland. It is in Connacht.
Castlebar holds 0.24% of Ireland's 5,356,950 people. Dublin, the largest place we list there, is 78 times its size. Twenty years earlier the World Gazetteer recorded 12,874, almost unchanged.
The population, measured on the census's boundary
| What you mean | Population | Source |
|---|---|---|
| Castlebar the CSO Built Up Area: the continuously built-up town | 13,054 | Census 2022 |
| Castlebar (GeoNames record) the figure in this page's heading; boundary unstated | 13,054 | GeoNames |
The census figure is the CSO's Census 2022 count for the Built Up Area, the boundary the CSO itself reports town populations on (data: CSO and Tailte Éireann, CC BY 4.0). Where the rows disagree, quote the census.
The 2005 figure comes from the World Gazetteer archive restored on this site. The two sources may draw the settlement's boundary differently, so treat the change as indicative rather than exact. Why figures differ.
Castlebar is in Connacht, which has 72 recorded places.
Nearby in size
| Place | Region | Population |
|---|---|---|
| Cobh | Munster | 14,148 |
| Mallow | Munster | 13,456 |
| Arklow | Leinster | 13,399 |
| Wicklow | Leinster | 12,957 |
| Foxrock | Leinster | 12,870 |
| Ashbourne | Leinster | 12,679 |
All places in Ireland → · Connacht →
Figures are the latest available in GeoNames (CC BY 4.0), which draws on national censuses of varying dates — treat them as recent, not same-year. Country totals are UN World Population Prospects 2024 (medium variant) where the UN lists the country separately; the handful it reports under a parent state keep a GeoNames figure and are marked as such. Sources & method.