Oldcastle has a population of 1,384, making it the 283rd largest place we list in Ireland. It is in Leinster.
Oldcastle holds under a tenth of one per cent of Ireland's 5,356,950 people. Dublin, the largest place we list there, is 740 times its size.
1,384
population
#283
in Ireland
The population, measured on the census's boundary
| What you mean | Population | Source |
|---|---|---|
| Oldcastle the CSO Built Up Area: the continuously built-up town | 1,409 | Census 2022 |
| Oldcastle (GeoNames record) the figure in this page's heading; boundary unstated | 1,384 | 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.
Oldcastle is in Leinster, which has 256 recorded places.
Nearby in size
| Place | Region | Population |
|---|---|---|
| Ferns | Leinster | 1,415 |
| Ardnacrusha | Munster | 1,414 |
| Swinford | Connacht | 1,394 |
| Moroe | Munster | 1,377 |
| Portraine | Leinster | 1,372 |
| Killucan | Leinster | 1,370 |
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.