| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|
| Argentina | June 22, 1946 | Ratification: August 31, 1953 | September 24, 1953 | |
| Bolivia (Plurinational State of) | June 22, 1946 | Ratification: June 11, 1947 | August 18, 1947 | |
| Brazil | June 22, 1946 | Ratification: March 12, 1949 | May 9, 1949 | |
| Chile | June 22, 1946 | Ratification: December 10, 1954 | January 14, 1955 | |
| Colombia | June 22, 1946 | Ratification: November 10, 1971 | January 4, 1972 | |
| Costa Rica | June 22, 1946 | Ratification: November 24, 1950 | December 20, 1950 | |
| Cuba | June 22, 1946 | Ratification: August 16, 1955 | September 29, 1955 | |
| Dominican Republic | June 22, 1946 | Ratification: January 13, 1947 | April 14, 1947 | |
| Ecuador | June 22, 1946 | Ratification: February 1, 1947 | April 14, 1947 | |
| El Salvador | June 22, 1946 | | | |
| Guatemala | June 22, 1946 | Ratification: November 30, 1951 | January 10, 1952 | |
| Haiti | June 22, 1946 | Ratification: February 18, 1953 | August 25, 1953 | |
| Honduras | June 22, 1946 | Ratification: June 7, 1947 | June 27, 1947 | |
| Mexico | June 22, 1946 | Ratification: February 27, 1947 | May 26, 1947 | |
| Nicaragua | June 22, 1946 | Ratification: June 9, 1950 | July 12, 1950 | |
| Panama | June 22, 1946 | Ratification: February 14, 1984 | June 7, 1984 | |
| Paraguay | June 22, 1946 | Ratification: February 14, 1984 | June 7, 1984 | |
| Peru | June 22, 1946 | | | |
| United States of America | June 22, 1946 | | | |
| Uruguay | June 22, 1946 | | | |
| Venezuela (Bolivarian Republic of) | June 22, 1946 | | | |
