| Country | Action | Action Date | Effective Date |
|---|
| Algeria | Extension | 21/06/1920 | |
| ARGENTINA | Signature | 21/06/1920 | |
| AUSTRALIA | Signature | 29/12/1920 | |
| AUSTRALIA | Ratification | 24/01/1923 | |
| BELGIUM | Signature | 21/06/1920 | |
| BELGIUM | Ratification | 17/10/1921 | |
| BRAZIL | Withdrawal | 21/06/1940 | |
| BULGARIA | Accession | 23/10/1922 | |
| BULGARIA | Withdrawal | 21/06/1955 | |
| CANADA | Signature | 29/12/1920 | |
| CANADA | Ratification | 24/01/1923 | |
| CHILE | Signature | 21/06/1920 | |
| CHINA | Signature | 21/06/1920 | |
| COSTA RICA | Signature | 21/06/1920 | |
| CUBA | Signature | 21/06/1920 | |
| CZECHOSLOVAKIA | Signature | 21/06/1920 | |
| CZECHOSLOVAKIA | Ratification | 06/11/1922 | |
| DENMARK | Signature | 21/06/1920 | |
| DENMARK | Ratification | 01/03/1922 | |
| East Indies | Extension | 21/06/1920 | |
| Eritrea | Extension | 21/06/1920 | |
| ESTONIA | Accession | 11/04/1928 | |
| FINLAND | Signature | 21/06/1920 | |
| FINLAND | Ratification | 17/10/1921 | |
| FRANCE | Signature | 21/06/1920 | |
| FRANCE | Ratification | 29/07/1922 | |
| French Indo-china | Extension | 21/06/1920 | |
| French West Africa | Extension | 21/06/1920 | |
| GERMANY | Accession | 11/04/1928 | |
| GREECE | Signature | 21/06/1920 | |
| GREECE | Ratification | 08/07/1938 | |
| HAITI | Signature | 21/06/1920 | |
| INDIA | Signature | 27/10/1920 | |
| INDIA | Ratification | 24/01/1923 | |
| Irish Free State | Accession | 19/06/1924 | |
| ITALY | Signature | 21/06/1920 | |
| ITALY | Ratification | 17/10/1921 | |
| JAPAN | Signature | 21/06/1920 | |
| JAPAN | Ratification | 04/03/1924 | |
| LUXEMBOURG | Signature | 21/06/1920 | |
| LUXEMBOURG | Ratification | 26/05/1922 | |
| Madagascar | Extension | 21/06/1920 | |
| MONACO | Signature | 21/06/1920 | |
| MONACO | Ratification | 17/10/1921 | |
| MOROCCO | Signature | 21/06/1920 | |
| NETHERLANDS THE | Signature | 21/06/1920 | |
| NETHERLANDS THE | Ratification | 01/03/1922 | |
| NEW ZEALAND | Signature | 29/12/1920 | |
| NEW ZEALAND | Ratification | 24/01/1923 | |
| NEW ZEALAND | Withdrawal | 21/06/1935 | |
| NORWAY | Signature | 21/06/1920 | |
| NORWAY | Ratification | 17/10/1921 | |
| PANAMA | Signature | 21/06/1920 | |
| PERU | Signature | 21/06/1920 | |
| POLAND | Signature | 21/06/1920 | |
| POLAND | Ratification | 16/05/1922 | |
| PORTUGAL | Signature | 21/06/1920 | |
| PORTUGAL | Ratification | 01/03/1922 | |
| PORTUGAL | Withdrawal | 21/06/1940 | |
| ROUMANIA | Signature | 21/06/1920 | |
| SERB-CROAT-SLOVENE STATE | Signature | 21/06/1920 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 17/10/1921 | |
| SIAM | Signature | 21/06/1920 | |
| SIAM | Ratification | 20/05/1922 | |
| Somaliland | Extension | 21/06/1920 | |
| SOUTH AFRICA | Signature | 29/12/1920 | |
| SOUTH AFRICA | Ratification | 24/01/1923 | |
| Southern Rhodesia | Accession | 09/07/1926 | |
| SOVIET UNION | Accession | 09/07/1926 | |
| SOVIET UNION | Withdrawal | 21/06/1945 | |
| SPAIN | Signature | 21/06/1920 | |
| SPAIN | Ratification | 08/03/1923 | |
| SWEDEN | Signature | 21/06/1920 | |
| SWEDEN | Ratification | 21/12/1921 | |
| SWITZERLAND | Signature | 21/06/1920 | |
| SWITZERLAND | Ratification | 10/11/1922 | |
| Tripoli | Extension | 21/06/1920 | |
| TUNIS | Signature | 21/06/1920 | |
| UNITED KINGDOM | Signature | 27/10/1920 | |
| UNITED KINGDOM | Ratification | 24/01/1923 | |
| URUGUAY | Signature | 21/06/1920 | |
| West Indies | Extension | 21/06/1920 | |