Top 13 Metropolitan Areas in China in 2020

1. Beijing (28.7 million)
2. Shandong (21.6)
3. Shanghai (20.5)
4. Shenzhen (14.2)
5. Guangzhou (11.9)
6. Chengdu (11.7)
7. Shenyang (11.6)
8. Chang-Zhu-Tan (Changsha-Zhuzhou-Xiangtan) (11.2)
9. Zhengzhou (11.1)
10. Chongqing (10.9)
11. Xi'an (10.7)
12. Wuhan (9.8)
13. Hefei (9.6)

Source:  http://www.portugalglobal.pt/PT/PortugalNews/EdicaoAicepPortugalGlobal/Documents/China200712.pdf