| Contracting Party | Signature | Instrument | In Force | Details |
| Albania | | Accession: June 19, 2003 | September 19, 2003 | Details |
| Algeria | | Accession: March 24, 1972 | July 5, 1972 | Details |
| Argentina | | Accession: October 24, 2007 | January 24, 2008 | Details |
| Armenia | | Accession: December 6, 2004 | March 6, 2005 | Details |
| Australia | | Accession: November 25, 1960 | April 8, 1961 | Details |
| Austria | June 15, 1957 | Accession: September 24, 1969 | November 30, 1969 | Details |
| Azerbaijan | | Accession: July 14, 2003 | October 14, 2003 | Details |
| Bahrain | | Accession: September 15, 2005 | December 15, 2005 | Details |
| Barbados | | Accession: December 12, 1974 | March 12, 1985 | Details |
| Belarus | | Accession: March 12, 1998 | June 12, 1998 | Details |
| Belgium | June 15, 1957 | Accession: March 5, 1962 | June 6, 1962 | Details |
| Benin | | Accession: April 3, 1978 | February 6, 1979 | Details |
| Bosnia and Herzegovina | | Declaration of Continued Application: June 2, 1993 | March 1, 1992 | Details |
| Bulgaria | | Accession: November 27, 2000 | February 27, 2001 | Details |
| China | | Accession: May 5, 1994 | August 9, 1994 | Details |
| Croatia | | Declaration / Notification of Succession: July 28, 1992 | October 8, 1991 | Details |
| Cuba | | Accession: September 26, 1995 | December 26, 1995 | Details |
| Czech Republic | | Declaration of Continued Application: December 18, 1992 | January 1, 1993 | Details |
| Democratic People's Republic of Korea | | Accession: March 6, 1997 | June 6, 1997 | Details |
| Denmark | June 15, 1957 | Ratification: October 30, 1961 | November 30, 1961 | Details |
| Dominica | | Accession: June 8, 2000 | September 8, 2000 | Details |
| Egypt | | Accession: March 18, 2005 | June 18, 2005 | Details |
| Estonia | | Accession: February 24, 1996 | May 27, 1996 | Details |
| Finland | | Accession: May 16, 1973 | August 18, 1973 | Details |
| France | June 15, 1957 | Ratification: November 9, 1959 | April 8, 1961 | Details |
| Georgia | | Accession: November 29, 2002 | February 28, 2003 | Details |
| Germany | June 15, 1957 | Ratification: December 29, 1961 | January 29, 1962 | Details |
| Greece | | Accession: August 7, 1998 | November 7, 1998 | Details |
| Guinea | | Accession: August 5, 1996 | November 5, 1996 | Details |
| Hungary | June 15, 1957 | Accession: December 29, 1966 | March 23, 1967 | Details |
| Iceland | | Accession: December 23, 1994 | April 9, 1995 | Details |
| Ireland | | Accession: October 3, 1966 | December 12, 1966 | Details |
| Israel | | Accession: September 19, 1960 | April 8, 1961 | Details |
| Italy | June 15, 1957 | Ratification: July 25, 1960 | April 8, 1961 | Details |
| Jamaica | | Accession: November 7, 2005 | February 7, 2006 | Details |
| Japan | | Accession: November 17, 1989 | February 20, 1990 | Details |
| Jordan | | Accession: August 14, 2008 | November 14, 2008 | Details |
| Kazakhstan | | Accession: January 24, 2002 | April 24, 2002 | Details |
| Kyrgyzstan | | Accession: September 10, 1998 | December 10, 1998 | Details |
| Latvia | | Accession: September 29, 1994 | January 1, 1995 | Details |
| Lebanon | June 15, 1957 | Ratification: May 30, 1960 | April 8, 1961 | |
| Liechtenstein | June 15, 1957 | Accession: January 24, 1967 | May 29, 1967 | Details |
| Lithuania | | Accession: November 22, 1996 | February 22, 1997 | Details |
| Luxembourg | June 15, 1957 | Accession: December 19, 1974 | March 24, 1975 | Details |
| Malawi | | Accession: July 24, 1995 | October 24, 1995 | Details |
| Malaysia | | Accession: June 28, 2007 | September 28, 2007 | Details |
| Mexico | | Accession: December 21, 2000 | March 21, 2001 | Details |
| Monaco | June 15, 1957 | Ratification: March 8, 1961 | April 8, 1961 | Details |
| Mongolia | | Accession: March 16, 2001 | June 16, 2001 | Details |
| Montenegro | | Declaration of Continued Application: December 4, 2006 | June 3, 2006 | Details |
| Morocco | June 15, 1957 | Accession: July 25, 1966 | October 1, 1966 | Details |
| Mozambique | | Accession: October 18, 2001 | January 18, 2002 | Details |
| Netherlands | June 15, 1957 | Accession: May 21, 1962 | August 20, 1962 | Details |
| Norway | June 15, 1957 | Ratification: June 28, 1961 | July 28, 1961 | Details |
| Poland | | Accession: December 4, 1996 | March 4, 1997 | Details |
| Portugal | June 15, 1957 | Ratification: April 28, 1959 | April 8, 1961 | Details |
| Republic of Korea | | Accession: October 8, 1998 | January 8, 1999 | Details |
| Republic of Moldova | | Accession: September 1, 1997 | December 1, 1997 | Details |
| Romania | December 18, 1958 | Accession: March 31, 1998 | June 30, 1998 | Details |
| Russian Federation | | Accession: April 8, 1971 | July 26, 1971 | Details |
| Saint Kitts and Nevis | | Accession: July 27, 2005 | October 27, 2005 | Details |
| Saint Lucia | | Accession: December 18, 2000 | March 18, 2001 | Details |
| Serbia | | Declaration of Continued Application: September 19, 2006 | April 27, 1992 | Details |
| Singapore | | Accession: December 18, 1998 | March 18, 1999 | Details |
| Slovakia | | Declaration of Continued Application: December 30, 1992 | January 1, 1993 | Details |
| Slovenia | | Declaration of Continued Application: June 12, 1992 | June 25, 1991 | Details |
| Spain | June 15, 1957 | Ratification: April 4, 1959 | April 8, 1961 | Details |
| Suriname | | Accession: July 24, 1981 | December 16, 1981 | Details |
| Sweden | June 15, 1957 | Ratification: June 28, 1961 | July 28, 1961 | Details |
| Switzerland | June 15, 1957 | Accession: July 20, 1962 | August 20, 1962 | Details |
| Syrian Arab Republic | | Accession: December 28, 2004 | March 28, 2005 | Details |
| Tajikistan | | Declaration of Continued Application: February 14, 1994 | December 25, 1991 | Details |
| the former Yugoslav Republic of Macedonia | | Declaration / Notification of Succession: July 23, 1993 | September 8, 1991 | Details |
| Trinidad and Tobago | | Accession: December 20, 1995 | March 20, 1996 | Details |
| Tunisia | June 15, 1957 | Accession: February 24, 1967 | May 29, 1967 | Details |
| Turkey | December 18, 1958 | Accession: October 1, 1995 | January 1, 1996 | Details |
| Turkmenistan | | Accession: March 7, 2006 | June 7, 2006 | Details |
| Ukraine | | Accession: September 29, 2000 | December 29, 2000 | Details |
| United Kingdom | June 15, 1957 | Accession: March 15, 1963 | April 15, 1963 | Details |
| United Republic of Tanzania | | Accession: June 14, 1999 | September 14, 1999 | Details |
| United States of America | | Accession: February 23, 1972 | May 25, 1972 | Details |
| Uruguay | | Accession: October 19, 1999 | January 19, 2000 | Details |
| Uzbekistan | | Accession: October 12, 2001 | January 12, 2002 | Details |