O’Fallon — UN urban centre
O’Fallon: 97,698 people. Reference: 2025 annual estimate · World rank #6,336 of 12,138 source urban centres. Source: UN DESA, World Urbanization Prospects 2025 (CC BY 3.0 IGO). Source identifier: 7023; 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: 38.7775, -90.6513. National context uses World Bank estimates, a separate series and geography; no national share is inferred here.
UN population series
| Year | People | Method |
|---|---|---|
| 2015 | 83,430 | Estimate |
| 2020 | 97,960 | Estimate |
| 2025 | 97,698 | Estimate |
| 2030 | 97,587 | Projection |
| 2035 | 94,734 | Projection |
| 2040 | 94,438 | Projection |
| 2045 | 92,907 | Projection |
| 2050 | 84,777 | Projection |
Largest UN urban centres · Fastest-growing urban centres
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