City of Belfast · Northern Ireland
Castlereagh population
56,679people · latest estimate
Castlereagh has a population of 56,679, making it the 2nd largest place in City of Belfast. The World Gazetteer published 56,679 for Castlereagh in 2005 and the current source still carries that same figure, so there is no measured change to report rather than no change having happened.
Year-by-year official estimates for the wider area: Belfast population trends, 2001–2024.
Castlereagh in context
Distances are straight-line from the settlement's recorded coordinates. The 10 km figure sums the recorded places within that radius, so it describes how built-up the surroundings are rather than people per square kilometre.
The population, measured on a real boundary
| What you mean | Population | Source |
|---|---|---|
| Metropolitan Castlereagh settlement NISRA's settlement boundary: the built-up Castlereagh | 59,198 | Census 2021 |
| Castlereagh (GeoNames record) the figure in this page's heading; boundary unstated | 56,679 | GeoNames |
The census figure is NISRA's Census 2021 count of usual residents inside the settlement's development limit: a boundary drawn in 2014–15 holding 2021 people, so growth at the edges since then sits outside it. 25,467 households. Where the rows disagree, quote the census. Northern Ireland's other layers wait on data that is either licensed (postcodes) or published only at district level (crime), and those absences are deliberate.
Common questions
What is the population of Castlereagh?
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Nearby in City of Belfast
| # | Place | Population |
|---|---|---|
| 1 | Belfast | 348,005 |