| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 16/04/1948 | |
| AUSTRIA | Ratification | 28/07/1948 | |
| Belgian Congo | Extension | 04/09/1948 | |
| BELGIUM | Signature | 16/04/1948 | |
| BELGIUM | Ratification | 04/09/1948 | |
| DENMARK | Signature | 16/04/1948 | |
| DENMARK | Ratification | 29/07/1948 | |
| FRANCE | Signature | 16/04/1948 | |
| FRANCE | Ratification | 28/07/1948 | |
| GERMANY | Signature | 16/04/1948 | |
| GERMANY | Ratification | 15/06/1948 | |
| GERMANY | Ratification | 29/07/1948 | |
| GREECE | Signature | 16/04/1948 | |
| GREECE | Ratification | 20/10/1949 | |
| ICELAND | Signature | 16/04/1948 | |
| ICELAND | Ratification | 28/07/1948 | |
| IRELAND, REPUBLIC OF | Signature | 16/04/1948 | |
| IRELAND, REPUBLIC OF | Statement | 28/04/1948 | |
| IRELAND, REPUBLIC OF | Ratification | 15/07/1948 | |
| ITALY | Signature | 16/04/1948 | |
| ITALY | Statement | 21/04/1948 | |
| ITALY | Ratification | 24/08/1948 | |
| NETHERLANDS THE | Signature | 16/04/1948 | |
| NETHERLANDS THE | Statement | 20/04/1948 | |
| NETHERLANDS THE | Ratification | 25/08/1948 | |
| NORWAY | Signature | 16/04/1948 | |
| NORWAY | Ratification | 24/08/1948 | |
| PORTUGAL | Signature | 16/04/1948 | |
| PORTUGAL | Ratification | 04/04/1949 | |
| Ruanda Urundi | Extension | 04/09/1948 | |
| SPAIN | Accession | 20/07/1959 | |
| SWEDEN | Signature | 16/04/1948 | |
| SWEDEN | Ratification | 29/07/1948 | |
| SWITZERLAND | Signature | 16/04/1948 | |
| SWITZERLAND | Ratification | 26/11/1948 | |
| TRIESTE UK-US ZONE | Accession | 14/10/1948 | |
| TURKEY | Signature | 16/04/1948 | |
| TURKEY | Ratification | 27/10/1948 | |
| UNITED KINGDOM | Signature | 16/04/1948 | |
| UNITED KINGDOM | Statement | 30/04/1948 | |
| UNITED KINGDOM | Ratification | 10/06/1948 | |