Megacity population and rank for world cities for the year 1955
| Rank | Megacity | Country | Population |
|---|---|---|---|
| 1 | Tokyo | Japan | 13,712,679 |
| 2 | New York-Newark | United States of America | 13,219,362 |
| 3 | Kinki M.M.A. (Osaka) | Japan | 8,622,976 |
| 4 | London | United Kingdom | 8,277,908 |
| 5 | Paris | France | 6,796,437 |
| 6 | Buenos Aires | Argentina | 5,910,271 |
| 7 | Moskva (Moscow) | Russian Federation | 5,748,746 |
| 8 | Shanghai | China | 5,712,858 |
| 9 | Chicago | United States of America | 5,564,573 |
| 10 | Kolkata (Calcutta) | India | 5,219,086 |
| 11 | Los Angeles-Long Beach-Santa Ana | United States of America | 5,154,301 |
| 12 | Ciudad de México (Mexico City) | Mexico | 4,293,878 |
| 13 | Mumbai (Bombay) | India | 3,726,210 |
| 14 | Rio de Janeiro | Brazil | 3,687,344 |
| 15 | Philadelphia | United States of America | 3,511,099 |
| 16 | Berlin | Germany | 3,298,503 |
| 17 | Sankt Peterburg (Saint Petersburg) | Russian Federation | 3,140,826 |
| 18 | Detroit | United States of America | 3,139,718 |
| 19 | Chukyo M.M.A. (Nagoya) | Japan | 3,100,066 |
| 20 | São Paulo | Brazil | 3,043,828 |
| 21 | Al-Qahirah (Cairo) | Egypt | 3,029,198 |
| 22 | Tianjin | China | 2,760,676 |
| 23 | Boston | United States of America | 2,680,181 |
| 24 | Manchester | United Kingdom | 2,424,868 |
| 25 | Shenyang | China | 2,407,477 |
| 26 | Beijing | China | 2,364,625 |
| 27 | Birmingham (West Midlands) | United Kingdom | 2,282,582 |
| 28 | Roma (Rome) | Italy | 2,142,917 |
| 29 | Hong Kong | China, Hong Kong SAR | 2,121,568 |
| 30 | Barcelona | Spain | 2,102,799 |
Data from UN World Urbanization Prospects