| Contracting Party | Signature | Instrument | In Force | Details |
| Albania | | Accession: June 1, 2000 | September 1, 2000 | |
| Algeria | | Accession: January 22, 2007 | April 22, 2007 | Details |
| Andorra | | Accession: February 25, 2004 | May 25, 2004 | |
| Argentina | October 26, 1961 | Ratification: December 2, 1991 | March 2, 1992 | |
| Armenia | | Accession: October 31, 2002 | January 31, 2003 | |
| Australia | | Accession: June 30, 1992 | September 30, 1992 | Details |
| Austria | October 26, 1961 | Ratification: March 9, 1973 | June 9, 1973 | Details |
| Azerbaijan | | Accession: July 5, 2005 | October 5, 2005 | |
| Bahrain | | Accession: October 18, 2005 | January 18, 2006 | |
| Barbados | | Accession: June 18, 1983 | September 18, 1983 | |
| Belarus | | Accession: February 27, 2003 | May 27, 2003 | Details |
| Belgium | October 26, 1961 | Ratification: July 2, 1999 | October 2, 1999 | Details |
| Bolivia (Plurinational State of) | | Accession: August 24, 1993 | November 24, 1993 | |
| Bosnia and Herzegovina | October 26, 1961 | Ratification: February 19, 2009 | May 19, 2009 | Details |
| Brazil | October 26, 1961 | Ratification: June 29, 1965 | September 29, 1965 | |
| Bulgaria | | Accession: May 31, 1995 | August 31, 1995 | Details |
| Burkina Faso | | Accession: October 14, 1987 | January 14, 1988 | |
| Cambodia | October 26, 1961 | | | |
| Canada | | Accession: March 4, 1998 | June 4, 1998 | Details |
| Cape Verde | | Accession: April 3, 1997 | July 3, 1997 | |
| Chile | October 26, 1961 | Ratification: June 5, 1974 | September 5, 1974 | |
| Colombia | | Accession: June 17, 1976 | September 17, 1976 | |
| Congo | | Accession: June 29, 1962 | May 18, 1964 | Details |
| Costa Rica | | Accession: June 9, 1971 | September 9, 1971 | Details |
| Croatia | | Accession: January 20, 2000 | April 20, 2000 | Details |
| Cyprus | | Accession: March 17, 2009 | June 17, 2009 | |
| Czech Republic | | Declaration / Notification of Succession: September 30, 1993 | January 1, 1993 | Details |
| Denmark | October 26, 1961 | Ratification: June 23, 1965 | September 23, 1965 | Details |
| Dominica | | Accession: August 9, 1999 | November 9, 1999 | |
| Dominican Republic | | Accession: October 27, 1986 | January 27, 1987 | |
| Ecuador | June 26, 1962 | Ratification: December 19, 1963 | May 18, 1964 | |
| El Salvador | | Accession: March 29, 1979 | June 29, 1979 | |
| Estonia | | Accession: January 28, 2000 | April 28, 2000 | Details |
| Fiji | | Accession: January 11, 1972 | April 11, 1972 | Details |
| Finland | June 21, 1962 | Ratification: July 21, 1983 | October 21, 1983 | Details |
| France | October 26, 1961 | Ratification: April 3, 1987 | July 3, 1987 | Details |
| Georgia | | Accession: May 18, 2004 | August 14, 2004 | |
| Germany | October 26, 1961 | Ratification: July 21, 1966 | October 21, 1966 | Details |
| Greece | | Accession: October 6, 1992 | January 6, 1993 | |
| Guatemala | | Accession: October 14, 1976 | January 14, 1977 | |
| Holy See | October 26, 1961 | | | |
| Honduras | | Accession: November 16, 1989 | February 16, 1990 | |
| Hungary | | Accession: November 10, 1994 | February 10, 1995 | |
| Iceland | October 26, 1961 | Accession: March 15, 1994 | June 15, 1994 | Details |
| India | October 26, 1961 | | | |
| Ireland | June 30, 1962 | Ratification: June 19, 1979 | September 19, 1979 | Details |
| Israel | February 7, 1962 | Accession: September 30, 2002 | December 30, 2002 | Details |
| Italy | October 26, 1961 | Ratification: January 8, 1975 | April 8, 1975 | Details |
| Jamaica | | Accession: October 27, 1993 | January 27, 1994 | |
| Japan | | Accession: July 26, 1989 | October 26, 1989 | Details |
| Kyrgyzstan | | Accession: May 13, 2003 | August 13, 2003 | |
| Latvia | | Accession: May 20, 1999 | August 20, 1999 | Details |
| Lebanon | June 26, 1962 | Ratification: May 12, 1997 | August 12, 1997 | |
| Lesotho | | Accession: October 26, 1989 | January 26, 1990 | Details |
| Liberia | | Accession: September 16, 2005 | December 16, 2005 | |
| Liechtenstein | | Accession: July 12, 1999 | October 12, 1999 | Details |
| Lithuania | | Accession: April 22, 1999 | July 22, 1999 | Details |
| Luxembourg | | Accession: November 25, 1975 | February 25, 1976 | Details |
| Mexico | October 26, 1961 | Ratification: February 17, 1964 | May 18, 1964 | |
| Monaco | June 22, 1962 | Ratification: September 6, 1985 | December 6, 1985 | Details |
| Montenegro | | Declaration of Continued Application: October 23, 2006 | June 3, 2006 | Details |
| Netherlands | | Accession: July 7, 1993 | October 7, 1993 | Details |
| Nicaragua | | Accession: May 10, 2000 | August 10, 2000 | |
| Niger | | Accession: April 5, 1963 | May 18, 1964 | Details |
| Nigeria | | Accession: July 29, 1993 | October 29, 1993 | Details |
| Norway | | Accession: April 10, 1978 | July 10, 1978 | Details |
| Panama | | Accession: June 2, 1983 | September 2, 1983 | |
| Paraguay | June 30, 1962 | Ratification: November 26, 1969 | February 26, 1970 | |
| Peru | | Accession: May 7, 1985 | August 7, 1985 | |
| Philippines | | Accession: June 25, 1984 | September 25, 1984 | |
| Poland | | Accession: March 13, 1997 | June 13, 1997 | Details |
| Portugal | | Accession: April 17, 2002 | July 17, 2002 | |
| Republic of Korea | | Accession: December 18, 2008 | March 18, 2009 | Details |
| Republic of Moldova | | Accession: September 5, 1995 | December 5, 1995 | Details |
| Romania | | Accession: July 22, 1998 | October 22, 1998 | Details |
| Russian Federation | | Accession: February 26, 2003 | May 26, 2003 | Details |
| Saint Lucia | | Accession: May 17, 1996 | August 17, 1996 | Details |
| Serbia | October 26, 1961 | Ratification: March 10, 2003 | June 10, 2003 | Details |
| Slovakia | | Declaration / Notification of Succession: May 28, 1993 | January 1, 1993 | Details |
| Slovenia | | Accession: July 9, 1996 | October 9, 1996 | Details |
| Spain | October 26, 1961 | Ratification: August 14, 1991 | November 14, 1991 | Details |
| Sweden | October 26, 1961 | Ratification: July 13, 1962 | May 18, 1964 | Details |
| Switzerland | | Accession: June 24, 1993 | September 24, 1993 | Details |
| Syrian Arab Republic | | Accession: February 13, 2006 | May 13, 2006 | |
| Tajikistan | | Accession: February 19, 2008 | May 19, 2008 | |
| the former Yugoslav Republic of Macedonia | | Accession: December 2, 1997 | March 2, 1998 | Details |
| Togo | | Accession: March 10, 2003 | June 10, 2003 | |
| Turkey | | Accession: January 8, 2004 | April 8, 2004 | |
| Ukraine | | Accession: March 12, 2002 | June 12, 2002 | |
| United Arab Emirates | | Accession: October 14, 2004 | January 14, 2005 | |
| United Kingdom | October 26, 1961 | Ratification: October 30, 1963 | May 18, 1964 | Details |
| Uruguay | | Accession: April 4, 1977 | July 4, 1977 | |
| Venezuela (Bolivarian Republic of) | | Accession: October 30, 1995 | January 30, 1996 | Details |
| Viet Nam | | Accession: December 1, 2006 | March 1, 2007 | Details |