Philadelphia — UN urban centre
Philadelphia: 2,232,420 people. Reference: 2025 annual estimate · World rank #225 of 12,138 source urban centres. Source: UN DESA, World Urbanization Prospects 2025 (CC BY 3.0 IGO). Source identifier: 8270; territory: United States (USA). UN source workbook.
Method: Degree of Urbanisation (contiguous 1 km2 cells, density 1,500+ people/km2, total 50,000+). This is a source-defined urban centre, not a municipality or province. No association with a separate administrative entity is inferred from proximity or name.
Source centroid: 39.9822, -75.1613. National context uses World Bank estimates, a separate series and geography; no national share is inferred here.
UN population series
| Year | People | Method |
|---|---|---|
| 1975 | 1,913,378 | Estimate |
| 1980 | 1,916,413 | Estimate |
| 1985 | 1,937,595 | Estimate |
| 1990 | 1,945,602 | Estimate |
| 1995 | 2,012,418 | Estimate |
| 2000 | 2,052,953 | Estimate |
| 2005 | 2,073,354 | Estimate |
| 2010 | 2,121,176 | Estimate |
| 2015 | 2,164,309 | Estimate |
| 2020 | 2,226,467 | Estimate |
| 2025 | 2,232,420 | Estimate |
| 2030 | 2,238,064 | Projection |
| 2035 | 2,286,094 | Projection |
| 2040 | 2,283,445 | Projection |
| 2045 | 2,278,431 | Projection |
| 2050 | 2,266,409 | Projection |
Largest UN urban centres · Fastest-growing urban centres
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