Castleknock has a population of 8,301, making it the 87th largest place we list in Ireland. It is in Leinster.
Castleknock holds 0.15% of Ireland's 5,356,950 people. Dublin, the largest place we list there, is 123 times its size.
8,301
population
#87
in Ireland
Castleknock is in Leinster, which has 256 recorded places.
Nearby in size
| Place | Region | Population |
|---|---|---|
| Beaumont | Leinster | 8,609 |
| Ballyfermot | Leinster | 8,558 |
| Rathgar | Leinster | 8,394 |
| Howth | Leinster | 8,277 |
| Baldoyle | Leinster | 8,043 |
| New Ross | Leinster | 8,040 |
All places in Ireland → · Leinster →
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.