| Albania | | Accession: February 8, 2019 | May 8, 2019 | Details |
| Algeria | | Accession: March 24, 1972 | July 5, 1972 | Details |
| Bosnia and Herzegovina | | Accession: April 4, 2013 | July 4, 2013 | Details |
| Bulgaria | | Accession: April 29, 1975 | August 12, 1975 | Details |
| Burkina Faso | | Accession: May 23, 1975 | September 2, 1975 | Details |
| Congo | | Accession: August 8, 1977 | November 16, 1977 | Details |
| Costa Rica | | Accession: April 30, 1997 | July 30, 1997 | Details |
| Cuba | October 31, 1958 | Ratification: September 17, 1963 | September 25, 1966 | Details |
| Czech Republic | | Declaration of Continued Application: December 18, 1992 | January 1, 1993 | Details |
| Democratic People's Republic of Korea | | Accession: October 4, 2004 | January 4, 2005 | Details |
| Dominican Republic | | Accession: October 17, 2019 | January 17, 2020 | Details |
| France | October 31, 1958 | Ratification: March 22, 1961 | September 25, 1966 | Details |
| Gabon | | Accession: March 6, 1975 | June 10, 1975 | Details |
| Georgia | | Accession: June 23, 2004 | September 23, 2004 | Details |
| Greece | December 22, 1959 | | | |
| Haiti | | Accession: January 17, 1961 | September 25, 1966 | |
| Hungary | October 31, 1958 | Ratification: December 29, 1966 | March 23, 1967 | Details |
| Iran (Islamic Republic of) | | Accession: December 9, 2005 | March 9, 2006 | Details |
| Israel | October 31, 1958 | Ratification: January 30, 1963 | September 25, 1966 | Details |
| Italy | October 31, 1958 | Ratification: July 10, 1968 | December 29, 1968 | Details |
| Mexico | | Accession: February 21, 1964 | September 25, 1966 | Details |
| Montenegro | | Declaration of Continued Application: December 4, 2006 | June 3, 2006 | Details |
| Morocco | October 31, 1958 | | | |
| Nicaragua | | Accession: March 15, 2006 | June 15, 2006 | Details |
| North Macedonia | | Accession: July 6, 2010 | October 6, 2010 | Details |
| Peru | | Accession: February 16, 2005 | May 16, 2005 | Details |
| Portugal | October 31, 1958 | Ratification: June 9, 1966 | September 25, 1966 | Details |
| Republic of Moldova | | Accession: January 5, 2001 | April 5, 2001 | Details |
| Romania | October 31, 1958 | | | Details |
| Serbia | | Declaration of Continued Application: September 19, 2006 | June 1, 1999 | Details |
| Slovakia | | Declaration of Continued Application: December 30, 1992 | January 1, 1993 | Details |
| Spain | October 31, 1958 | | | |
| Togo | | Accession: January 28, 1975 | April 30, 1975 | Details |
| Tunisia | | Accession: July 31, 1973 | October 31, 1973 | Details |
| Turkey | April 24, 1959 | | | |
