Top International Cities

This is my list of cities that have the most international political power, based on international organizations that are based there.

1. New York. Headquarters of the UN.
2. Geneva. 2nd largest site of UN.  Former capital of the League of Nations. HQ of WTO and World Economic Forum.
3. Vienna.  Location of many UN organizations. Headquarters of the OSCE.
4. The Hague, Netherlands.  International Court of Justice, International Criminal Court and more than 150 international organizations located there.
5. Brussels, Belgium.  Capital of the European Union and NATO.
6. Strasbourg, France. Headquarters for the Council of Europe, and part-time seat of European Parliament.
7. Nairobi, Kenya. Headquarters of United Nations Environment Programme, and many regional United Nations offices.
8. Paris, France. HQ of UNESCO, OECD and other international organizations. Also headquarters of the French Community.
9. Rome. Some UN offices.  Also, Roman Catholic Church. Location of Treaty of Rome.
10. Lausanne, Switzerland.  Headquarters of the IOC and other international sports organizations.
11. Washington DC. HQ of the World Bank.
12. Addis Ababa, Ethiopia.  HQ of the African Union
13. London. Headquarters of the Commonwealth of Nations and International Maritime Organization.
14. Singapore. Headquarters off the Asian Pacific Economic Cooperation forum.
15. Lyon, France.  Headquarters of Interpol.
16. Bonn, Germany. HQ of UN Framework Convention on Climate Change.
17. Berne, Switzerland. HQ of the Universal Postal Union
18. Montevideo, Uruguay. HQ of Mercosur
19. Tokyo. HQ of United Nations University
20. Cairo. HQ of the Arab League.
21. Lisbon, Portugal. HQ of the Lusophone (Portuguese-speaking countries)
22. Beijing. HQ of the Shanghai Cooperation Organzation (made up of China, Russia, Kazahkstan, Kyrgyzstan, Tajikistan, and Uzbekistan)
23. Abuja, Nigeria. HQ of ECOWAS
24. Riyadh, Saudi Arabia. HQ of Gulf Cooperation Council.
25. Oslo, Norway. Home of the Nobel Peace Prize.  Also location of some UN offices.

Honorable Mention:  Arusha, Tanzania (HQ of East African Union.  Also housed a UN tribunal).  Copenhagen (houses a small UN office).  Trieste and Turin, Italy (UN offices).  Montreal (HQ of International Civil Aviation Organization).

Update:  Hamburg, Germany (location of International Tribunal for the Law of the Sea).  San Jose, Costa Rica (site of Inter-American Court of Human Rights).  Abu Dhabi (International Renewable Energy Agency).  Jakarta (HQ of ASEAN). Jeddah (Organisation of Islamic Cooperation). Los Angeles (ICANN).