Top 25 Global Cities, version 20

Here is an updated list of the Top 25 Cities.  In general, the ranking is by nominal GDP in US dollars (not PPP), and the cities should all be prefixed with the word "Greater".  The main difference from the previous version is the inclusion of Chinese cities with surrounding areas.  Estimates for London, Washington and Philadelphia have been reduced.  Previous ranking in brackets.

1. Tokyo, Japan [1]
2. Shanghai/Suzhou/Nanjing, China [12]
3. New York, US [2]
4. Hong Kong/Guangzhou/Foshan/Shenzhen, China [28]
5. Los Angeles, US [3]
6. Beijing/Tianjin, China  [27]
7. Paris, France [5]
8. Seoul, South Korea [7]
9. Chicago, US [9]
10. London, UK [6]
11. Osaka/Kobe, Japan [4]
12. San Francisco/San Jose, US [10]
13. Rhine-Ruhr, Germany [11]
14. Nagoya/Chukyo, Japan [14]
15. Houston, US [15]
16. Boston, US [16]
17. Washington/Baltimore, US [8]
18. Dallas/Ft. Worth, US [17]
19. Randstad, Netherlands  [18]
20. Philadelphia, US [14]
21. Milan, Italy [19]
22. Sydney, Australia [20]
23. Toronto, Canada [21]
24. Melbourne, Australia [22]
25. Atlanta, US [23]

Honorable mention:  Sao Paulo, Singapore, Miami, Chongqing/Chengdu