According to this report, Wuhan will be the world’s 30st largest urban area (China’s 4th largest, behind Shanghai, Beijing, and Tianjin) in 2020, with 9.18 million people. It’s the third fastest growing city in China. 

• 28. Bangalore – 9.92m
• 29. Chicago – 9.84m
• 30. Wuhan – 9.18m
• 31. Seoul – 8.88m
• 32. Chennai – 8.88m 

The top 10 (in 2020) are also interesting, with the obvious caveat that forecasting by simply extending current trends (without convincing reasons for doing so) can lead to erroneous conclusions. 

• 1. Tokyo – 37.28m
• 2. Mumbai – 25.97m
• 3. Delhi – 25.83m
• 4. Dhaka – 22.04m
• 5. Mexico City – 21.81m
• 6. Sao Paulo – 21.57m
• 7. Lagos – 21.51m
• 8. Jakarta – 20.77m
• 9. New York – 20.43m
• 10. Karachi – 18.94m