Eighteen ratifications were required to bring the IAEA´s Statute into force on 29 July 1957.
As of September 2008, the IAEA has 145 Member States. (See Notes for relevant explanatory information).
1957 Afghanistan, Albania, Argentina, Australia, Austria, Belarus, Brazil, Bulgaria, Canada, Cuba, Denmark, Dominican Republic, Egypt, El Salvador, Ethiopia, France, Germany, Greece, Guatemala, Haiti, Holy See, Hungary, Iceland, India, Indonesia, Israel, Italy, Japan, Republic of Korea, Monaco, Morocco, Myanmar, Netherlands, New Zealand, Norway, Pakistan, Paraguay, Peru, Poland, Portugal, Romania, Russian Federation, Serbia, South Africa, Spain, Sri Lanka, Sweden, Switzerland, Thailand, Tunisia, Turkey, Ukraine, United Kingdom, United States, Venezuela, Vietnam
1958 Belgium, Ecuador, Finland, Islamic Republic of Iran, Luxembourg, Mexico, Philippines, Sudan
1959 Iraq
1960 Chile, Colombia, Ghana, Senegal
1961 Lebanon, Mali, Democratic Republic of the Congo
1962 Liberia, Saudi Arabia
1963 Algeria, Bolivia, Côte d´Ivoire, Libyan Arab Jamahiriya, Syrian Arab Republic, Uruguay
1964 Cameroon, Gabon, Kuwait, Nigeria
1965 Costa Rica, Cyprus, Jamaica, Kenya, Madagascar
1966 Jordan, Panama
1967 Sierra Leone, Singapore, Uganda
1968 Liechtenstein
1969 Malaysia, Niger, Zambia
1970 Ireland
1972 Bangladesh
1973 Mongolia
1974 Mauritius
1976 Qatar, United Arab Emirates, United Republic of Tanzania
1977 Nicaragua
1983 Namibia
1984 China
1986 Zimbabwe
1992 Estonia, Slovenia
1993 Armenia, Croatia, Czech Republic, Lithuania, Slovakia
1994 The Former Yugoslav Republic of Macedonia, Kazakhstan, Marshall Islands, Uzbekistan, Yemen
1995 Bosnia and Herzegovina
1996 Georgia
1997 Latvia, Malta, Republic of Moldova
1998 Burkina Faso
1999 Angola, Benin
2000 Tajikistan
2001 Azerbaijan, Central African Republic
2002 Eritrea, Botswana
2003 Honduras, Seychelles, Kyrgyzstan
2004 Islamic Republic of Mauritania, Togo
2005 Chad
2006 Belize, Malawi, Montenegro, Mozambique
2007 Bahrain, Burundi, Cape Verde, Republic of Congo
2008 Lesotho, Nepal, Oman, Palau
Year denotes year of membership. Names of States are not necessarily their historical designations.
The Democratic People´s Republic of Korea (DPRK), which joined the IAEA in 1974, withdrew its membership of the Agency 13 June 1994.
Cambodia, which joined the IAEA in 1958, withdrew its membership of the Agency 26 March 2003.
The former Federal Republic of Yugoslavia was changed to Serbia and Montenegro as of 4 February 2003. In June 2006, IAEA membership of Serbia and Montenegro was continued by the Republic of Serbia. This followed the Declaration of Independence adopted by the National Assembly of Montenegro on 3 June 2006. The Republic of Montenegro subsequently, on 14 June 2006, applied for membership of the IAEA, a process that is pending completion of procedures required to become an IAEA Member State.
For States in italics, membership has been approved by the IAEA General Conference and will take effect once the State deposits the necessary legal instruments with the IAEA.