# Member state

A member state is a state that is a member of an international organization or of a federation or confederation.
Since the World Trade Organization (WTO) and the International Monetary Fund (IMF) include some members that are not sovereign states, neither organization ever speaks of "member states". The WTO has simply "members" (see WTO members), and the IMF refers to its members as "member countries".
The oldest global member state based organization is the International Telecommunication Union, which joined the United Nations System as a Specialized Agency of the T1088 after the creation of the UN.

## Worldwide

* Member states of the United Nations | 193
* Member states of the International Telecommunication Union | 193
* Member states of UNESCO | 195
* Interpol § Members | 190
* Member states of the World Intellectual Property Organization | 184
* Member states of the World Sports Alliance | 49
* Member states of the League of Nations
* Member states of the Venice Commission | 58
* Member states of the World Customs Organization | 173 sovereign states, 4 customs territories and one customs union
* Member states of the World Trade Organization | 166
* International Hydrographic Organization § Member countries
* International Centre for the Study of the Preservation and Restoration of Cultural Property § Member states
* Alliance of Small Island States § Member states | 39
* Intersputnik § Member states
* World Health Organization | 194

### Worldwide - language related

* Member states of the Arab League | 22
* Member states of the Dutch Language Union | 3
* Member states of the Commonwealth of Nations | 56
* Member states of the Latin Union | 36
* Member states of the Community of Portuguese Language Countries | 8
* Member states of the International Organization of the Francophonie
* Member states of the Organization of Ibero-American States | 24

### Worldwide - religion related

* Member states of the Organisation of Islamic Cooperation | 57

### Worldwide - commodity related

* Member states of the International Atomic Energy Agency | 167
* Member states of OPEC | 12
* Member states of CIP | 14
* Member states of the Organisation for the Prohibition of Chemical Weapons | 195+

## Restricted to a continent or larger region

| | Count | Region | Note |
| Member states of the Council of Europe | 47 | Europe |
| Member state of the European Union | 27 | Europe |
| Member states of the European Economic Area | 30 | Europe | EU + Iceland, Liechtenstein, Norway |
| Member states of the European Environment Agency | 32 | Europe | EU + Iceland, Liechtenstein, Norway, Switzerland, Turkey |
| Member states of the European Aviation Safety Agency | 31 | Europe | EU + Iceland, Liechtenstein, Norway, Switzerland |
| Member states of the European Union Customs Union | 31 | Europe | EU + Turkey, San Marino, Andorra, Monaco |
| Member states of the Eurozone | 19 | Europe |
| Member states of the European Free Trade Association | 4 | Europe |
| Member states of the Organization of the Black Sea Economic Cooperation | | Europe |
| Central European Free Trade Agreement | | Europe |
| Member states of the European Southern Observatory | 15 | Europe |
| Nordic Council#Members | 5 | Europe |
| Council of the Baltic Sea States#Member states | | Europe |
| Western European and Others Group#WEOG Member States | | Europe |
| Eastern European Group#Members | | Europe |
| European Space Agency | 22 | Europe | 1 Associate Canada |
| Member states of the Organization of American States | 35 | America | +75 Permanent Observers |
| Member states of the Union of South American Nations | 12 | America |
| Member states of Mercosur | 5 | America |
| Member states of the Bolivarian Alliance for the Americas | 8 | America |
| Member states of the Caribbean Community | 15 | America |
| Association of Caribbean States#Member states | 25 | America |
| Caribbean Meteorological Organisation | | America |
| Inter-American Development Bank#Member states | 48 | America |
| Member states of the African Union | 55 | Africa | 9 observer states + 1 suspended |
| Southern African Development Community | 14 | Africa |
| Member states of the Association of Southeast Asian Nations | 10 | Asia |
| Member states of the Cooperation Council for the Arab States of the Gulf | 6 | Asia |
| Member states of Shanghai Cooperation Organisation | 6 | Asia | +5 observers |
| United Nations Economic and Social Commission for Western Asia#Member states | 14 | Asia |
| Economic Cooperation Organization#Member states | 10 | Asia |
| Arctic Council#Member states | 8 | Arctic | 13 observers |

### Other

* Member states of the Commonwealth of Independent States | 9 + 2 unofficial participants (Turkmenistan and Ukraine)

## Military

* Member states of NATO | 32
In history:
* Warsaw Pact § Members
* Central Powers § Member states