| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AFGHANISTAN | Accession | 23/11/1925 | |
| ALBANIA | Accession | 29/04/1930 | |
| ARGENTINE REPUBLIC | Accession | 06/05/1927 | |
| Australia | Extension | 29/12/1923 | |
| AUSTRIA | Accession | 12/03/1930 | |
| BELGIUM | Accession | 27/05/1925 | |
| BULGARIA | Accession | 20/10/1925 | |
| Canada | Extension | 29/12/1923 | |
| Caribbean part of the Netherlands | Extension | 10/10/2010 | |
| CHILE | Accession | 17/12/1928 | |
| CHINA | Accession | 01/07/1925 | |
| CZECH REPUBLIC | Succession | 21/06/2006 | 01/01/1993 |
| CZECHOSLOVAKIA | Accession | 09/07/1930 | |
| DENMARK | Signature | 09/02/1920 | |
| DENMARK | Ratification | 24/01/1924 | |
| DOMINICAN REPUBLIC | Accession | 03/02/1927 | |
| EGYPT | Accession | 13/09/1925 | |
| ESTONIA | Accession | 07/04/1930 | |
| FINLAND | Accession | 12/08/1925 | |
| FRANCE | Signature | 09/02/1920 | |
| FRANCE | Ratification | 06/09/1924 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 23/09/1974 | 07/08/1974 |
| GERMANY | Accession | 16/11/1925 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 30/01/1953 | 01/01/1953 |
| GREECE | Accession | 21/10/1925 | |
| HEJAZ | Accession | 14/08/1925 | |
| HUNGARY | Accession | 29/10/1927 | |
| ICELAND | Accession | 31/05/1994 | |
| India | Extension | 29/12/1923 | |
| Irish Free State | Extension | 29/12/1923 | |
| ITALY | Signature | 09/02/1920 | |
| ITALY | Ratification | 06/08/1924 | |
| JAPAN | Signature | 09/02/1920 | |
| JAPAN | Ratification | 02/04/1925 | |
| LATVIA | Accession | 13/06/2016 | |
| MONACO | Accession | 22/06/1925 | |
| NETHERLANDS THE | Signature | 09/02/1920 | |
| NETHERLANDS THE | Ratification | 03/09/1920 | |
| New Zealand | Extension | 29/12/1923 | |
| NORWAY | Signature | 09/02/1920 | |
| NORWAY | Ratification | 08/10/1924 | |
| POLAND | Accession | 02/09/1931 | |
| PORTUGAL | Accession | 24/10/1927 | |
| ROUMANIA | Accession | 10/07/1925 | |
| SERB-CROAT-SLOVENE STATE | Accession | 06/07/1925 | |
| South Africa | Extension | 29/12/1923 | |
| SOVIET UNION | Accession | 07/05/1935 | |
| SPAIN | Accession | 12/11/1925 | |
| SWEDEN | Signature | 09/02/1920 | |
| SWEDEN | Ratification | 15/09/1924 | |
| SWITZERLAND | Accession | 30/06/1925 | |
| UNITED KINGDOM | Signature | 09/02/1920 | |
| UNITED KINGDOM | Ratification | 29/12/1923 | |
| UNITED KINGDOM | Re-Application | 30/01/1953 | 01/01/1953 |
| UNITED STATES OF AMERICA | Signature | 09/02/1920 | |
| UNITED STATES OF AMERICA | Ratification | 02/04/1924 | |
| VENEZUELA | Accession | 08/02/1928 |