Bo — UN urban centre
Bo: 345,988 people. Reference: 2025 annual estimate · World rank #1,654 of 12,138 source urban centres. Source: UN DESA, World Urbanization Prospects 2025 (CC BY 3.0 IGO). Source identifier: 1027; territory: Sierra Leone (SLE). 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: 7.9566, -11.7361. National context uses World Bank estimates, a separate series and geography; no national share is inferred here.
UN population series
| Year | People | Method |
|---|---|---|
| 1975 | 75,742 | Estimate |
| 1980 | 81,728 | Estimate |
| 1985 | 92,309 | Estimate |
| 1990 | 116,919 | Estimate |
| 1995 | 125,349 | Estimate |
| 2000 | 140,606 | Estimate |
| 2005 | 199,849 | Estimate |
| 2010 | 245,357 | Estimate |
| 2015 | 291,375 | Estimate |
| 2020 | 325,066 | Estimate |
| 2025 | 345,988 | Estimate |
| 2030 | 371,044 | Projection |
| 2035 | 394,308 | Projection |
| 2040 | 416,047 | Projection |
| 2045 | 441,389 | Projection |
| 2050 | 460,506 | Projection |
Largest UN urban centres · Fastest-growing urban centres
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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.