2010 Ranking at Wikipedia by Demographia
| Rank | City | Population | Source | Rank Among Sources |
|---|---|---|---|---|
| 1 | Tokyo | 37,037,000 | World Gazetter | 1 |
| 2 | New York | 27,900,000 | insee.fr | 2,3,4,5 |
| 3 | Seoul | 23,100,000 | citypopulation.de | 2,3,4,11,23 |
| 4 | Mexico City | 22,752,000 | World Gazetter | 2,3,4 |
| 5 | Bombay | 21,100,000 | citypopulation.de | 3,4,5,6,9,10 |
| 6 | Delhi | 20,800,000 | citypopulation.de | 6,8,9,12,14 |
| 7 | Jakarta | 20,100,000 | insee.fr | 5,7,8,9,10,12,15,21 |
| 8 | Sao Paulo | 19,638,000 | World Gazetter | 4,5,6,7, |
| 9 | Manila | 18,900,000 | insee.fr | 6,7,9,14,15,16,19,20 |
| 10 | Shanghai | 18,600,000 | citypopulation.de | 7,8,10,11,12,13, |
| 11 | Los Angeles | 18,426,000 | populationdata.net | 6,8,9,10,12 |
| 12 | Hong Kong/Shenzhen | 17,731,000 | wikipedia | 10,25,30 |
| 13 | Osaka | 17,647,000 | populationdata.net | 7,8,11,16,17,18, |
| 14 | Cairo | 15,800,000 | citypopulation.de | 10,11,12,15,16,17 |
| 15 | Calcutta | 15,400,000 | citypopulation.de | 6,7,11,13,14,15,17, |
| 16 | Moscow | 14,613,000 | World Gazetter | 15,16,17,18,19,20,24 |
| 17 | Karachi | 14,600,000 | citypopulation.de | 13,15,19,20,22,25 |
| 18 | Buenos Aires | 14,235,000 | populationdata.net | 8,9,10,14,16,17,20 |
| 19 | Dacca | 13,600,000 | citypopulation.de | 8,10,11,15,16,18,19,21 |
| 20 | Lagos | 13,488,000 | World Atlas | 7,14,17,24,26 |
| 21 | Beijing | 13,160,000 | demographia.com | 12,13,16,19,23,26 |
| 22 | London | 12,629,000 | World Gazetter | 17,18,22,25,27,28 |
| 23 | Tehran | 12,487,000 | World Gazetter | 17,18,21,23,27,29 |
| 24 | Istanbul | 12,250,000 | World Gazetter | 18,19,21,22,23, |
| 25 | Rio de Janeiro | 12,200,000 | citypopulation.de | 14,15,19,20,22 |
| 26 | Rhein-Ruhr | 11,806,000 | World Gazetter | 24 |
| 27 | Tianjin | 11,700,000 | insee.fr | 17,24,25,27,30 |
| 28 | Paris | 11,695,000 | World Gazetter/populationdata.net | 17,21,22,25,27 |
| 29 | Bangkok (Krung Thep) | 10,231,000 | World Gazetter | 28 |
