Portsmouth — UN urban centre population
Portsmouth has a recorded base population of 488,385 for the UN urban centre definition (2025 annual estimate). UN DESA, World Urbanization Prospects 2025; the moving counter uses UN 2025–2026 annual growth, not new population observations.
At a glance
Separate UN urban-centre definition
Portsmouth UN urban centre: 488,385 people (2025), equal to the displayed UN urban centre figure of 488,385. Separate GeoNames settlement record: 208,100; the UN value is larger (different boundaries; GeoNames population date unavailable). UN WUP 2025 Degree of Urbanisation; not a municipal/province boundary. Association: name/country/coordinates matched; boundary relationship unverified. No containment claim is made.
Administrative units of Portsmouth
1 administrative records listed; completeness not established. 1 of 1 population values available; population values and dates not independently verified.
Available-value subtotal: 18,514; not a reconciled total. Shares use the displayed UN urban centre denominator 488,385; mixed/unknown dates are not comparable. An em dash means missing, not zero.
| Unit | Population | Share | Membership |
|---|---|---|---|
| Southsea | 18,514 | 3.79% | Not independently verified |
Comparable database records
Same definition label: UN urban centre. Dates/boundaries may still differ; this is not a harmonised international city ranking. Ratios use 488,385 as denominator.
| Place | Population | vs Portsmouth |
|---|---|---|
| Provo | 488,429 | +0.0% |
| Kākināda | 488,958 | +0.1% |
| Dimāpur | 487,500 | −0.2% |
| Québec | 490,451 | +0.4% |
| Cusco | 490,968 | +0.5% |
About these numbers
Source: UN DESA, World Urbanization Prospects 2025. Reference: 2025 annual estimate. Live method: exponential projection from modelling anchor 2025-01-01 using UN 2025–2026 annual growth (+1.36% per year). This anchor is a modelling convention, not an observed population date. Tiles, ranks and comparisons use the recorded base figure 488,385, not the ticking estimate. Country/world denominators are World Bank values and can differ in date and method from local/UN values. Ranks cover only records with the same definition label in this database, not all cities in the world.
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This page is a structured reference entry. Its sources, geographic definition and reference dates determine what the figures mean; it is not independent reporting about the causes of change. Read the accompanying explanation before comparing different places or vintages.