| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|
| Argentina | October 17, 1975 | Ratification: January 11, 1977 | January 11, 1977 | |
| Barbados | October 17, 1975 | Ratification: June 4, 1976 | June 7, 1976 | |
| Bolivia (Plurinational State of) | October 17, 1975 | Ratification: June 7, 1976 | July 7, 1976 | |
| Brazil | October 17, 1975 | Ratification: May 14, 1976 | July 7, 1976 | |
| Chile | October 17, 1975 | Ratification: October 18, 1977 | October 18, 1977 | |
| Colombia | October 17, 1975 | Ratification: June 18, 1979 | June 18, 1979 | |
| Costa Rica | October 17, 1975 | Ratification: February 15, 1977 | February 15, 1977 | |
| Cuba | October 17, 1975 | Ratification: January 14, 1976 | July 7, 1976 | |
| Dominican Republic | October 17, 1975 | Ratification: June 4, 1976 | July 7, 1976 | |
| Ecuador | October 17, 1975 | Ratification: April 2, 1976 | July 7, 1976 | |
| El Salvador | October 17, 1975 | Ratification: September 22, 1976 | September 22, 1976 | |
| Grenada | October 17, 1975 | Ratification: December 15, 1976 | December 15, 1976 | |
| Guatemala | October 17, 1975 | Ratification: November 1, 1976 | November 1, 1976 | |
| Guyana | October 17, 1975 | Ratification: January 17, 1976 | June 7, 1976 | |
| Haiti | October 17, 1975 | Ratification: March 17, 1977 | March 17, 1977 | |
| Honduras | October 17, 1975 | Ratification: June 15, 1976 | June 15, 1976 | |
| Jamaica | October 17, 1975 | Ratification: June 4, 1976 | June 7, 1976 | |
| Mexico | October 17, 1975 | Ratification: January 14, 1976 | June 7, 1976 | |
| Nicaragua | October 17, 1975 | Ratification: September 2, 1976 | September 2, 1976 | |
| Panama | October 17, 1975 | Ratification: December 4, 1975 | June 7, 1976 | |
| Peru | October 17, 1975 | Ratification: April 5, 1976 | June 7, 1976 | |
| Suriname | October 17, 1975 | Ratification: July 27, 1979 | July 27, 1979 | |
| Trinidad and Tobago | October 17, 1975 | Ratification: June 7, 1976 | June 7, 1976 | |
| Uruguay | October 17, 1975 | Ratification: March 16, 1977 | March 16, 1977 | |
| Venezuela (Bolivarian Republic of) | October 17, 1975 | Ratification: January 14, 1976 | June 7, 1976 | |
