Some of these numbers are surprising. When I was in Chongqing, they told me that the city district has 32 million people, which would put it second in the world. Much depends on what one calls the borders of the city. I was surprised that they put New York's population at 21,900,000. They must include a lot of surrounding areas, including Brooklyn, Staten Island, Bronx. If they included North Jersey, Long Island, and many of the towns North of the City that are bedroom communities for New York City, I suspect that the number will be greater than Tokyo.

Wise.

http://www.newspapers24.com/world-cities/index.html

1. Tokyo (Japan) 34,200,000
2. Mexico (Mexico) 22,800,000
3. Seoul (South Korea) 22,300,000
4. New York (US) 21,900,000
5. Sao Paulo (Brazil) 20,200,000
6. Mumbai (India) 19,850,000
7. New Delhi (India) 19,700,000
8. Shanghai (China) 18,150,000
9. Los Angeles (US) 18,000,000
10. Osaka (Japan) 16,800,000
11. Jakarta (Indonesia) 16,550,000
12. Kolkata (India) 15,650,000
13. Cairo (Egypt) 15,600,000
14. Manila (Philippines) 14,950,000
15. Karachi (Pakistan) 14,300,000
16. Moscow (Russia) 13,750,000
17. Buenos Aires (Argentina) 13,450,000
18. Dhaka (Bangladesh) 13,250,000
19. Rio de Janeiro (Brazil) 12,150,000
20. Beijing (China) 12,100,000
21. London (UK) 12,000,000
22. Tehran (Iran) 11,850,000
23. Istanbul (Turkey) 11,500,000
24. Lagos (Nigeria) 11,100,000
25. Shenzhen (China) 10,700,000