| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 04/04/1949 | |
| BELGIUM | Ratification | 16/06/1949 | |
| BULGARIA | Accession | 29/03/2004 | 29/03/2004 |
| CANADA | Signature | 04/04/1949 | |
| CANADA | Ratification | 03/05/1949 | |
| DENMARK | Signature | 04/04/1949 | |
| DENMARK | Ratification | 24/08/1949 | |
| ESTONIA | Accession | 29/03/2004 | 29/03/2004 |
| FRANCE | Signature | 04/04/1949 | |
| FRANCE | Ratification | 24/08/1949 | |
| GERMANY FEDERAL REPUBLIC | Accession | 06/05/1955 | |
| GREECE | Accession | 18/02/1952 | |
| ICELAND | Signature | 04/04/1949 | |
| ICELAND | Ratification | 01/08/1949 | |
| ITALY | Signature | 04/04/1949 | |
| ITALY | Ratification | 24/08/1949 | |
| LATVIA | Accession | 29/03/2004 | 29/03/2004 |
| LITHUANIA | Accession | 29/03/2004 | 29/03/2004 |
| LUXEMBOURG | Signature | 04/04/1949 | |
| LUXEMBOURG | Ratification | 27/06/1949 | |
| NETHERLANDS THE | Signature | 04/04/1949 | |
| NETHERLANDS THE | Ratification | 12/08/1949 | |
| NORWAY | Signature | 04/04/1949 | |
| NORWAY | Ratification | 08/07/1949 | |
| PORTUGAL | Signature | 04/04/1949 | |
| PORTUGAL | Ratification | 24/08/1949 | |
| ROMANIA | Accession | 29/03/2004 | 29/03/2004 |
| SLOVAK REPUBLIC | Accession | 29/03/2004 | 29/03/2004 |
| SLOVENIA | Accession | 29/03/2004 | 29/03/2004 |
| SPAIN | Accession | 30/05/1982 | |
| TURKEY | Accession | 18/02/1952 | |
| UNITED KINGDOM | Signature | 04/04/1949 | |
| UNITED KINGDOM | Ratification | 07/06/1949 | |
| UNITED STATES OF AMERICA | Signature | 04/04/1949 | |
| UNITED STATES OF AMERICA | Ratification | 25/07/1949 | |