| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|
| Bolivia (Plurinational State of) | September 26, 1940 | | | Details |
| Brazil | | Definitive Signature: September 6, 1940 | September 6, 1940 | Details |
| Colombia | May 25, 1940 | Ratification: April 2, 1943 | June 10, 1943 | Details |
| El Salvador | May 21, 1940 | Ratification: December 9, 1940 | February 6, 1941 | Details |
| Mexico | December 15, 1951 | Ratification: May 12, 1953 | June 24, 1953 | Details |
| Nicaragua | May 27, 1940 | | | |
| Panama | April 10, 1940 | | | |
| Paraguay | June 2, 1998 | | | |
| United States of America | October 3, 1941 | Ratification: April 3, 1942 | April 16, 1942 | |
| Venezuela (Bolivarian Republic of) | February 20, 1940 | Ratification: October 9, 1941 | November 3, 1941 | Details |
