| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Anguilla | |||
| Barbados | Accession | 22/01/1925 | |
| British Guiana | Accession | 22/01/1925 | |
| British Honduras | Accession | 22/01/1925 | |
| British Virgin Islands | |||
| Cayman Islands | |||
| Ceylon | Accession | 22/01/1925 | |
| Cyprus | Accession | 22/01/1925 | |
| Falkland Islands | Accession | 04/04/1925 | |
| Gold Coast | Accession | 22/01/1925 | |
| Hong Kong | Accession | 10/08/1925 | |
| Jamaica | Accession | 04/04/1925 | |
| Kenya | Accession | 04/06/1936 | |
| Kenya | Extension | 14/06/1936 | |
| Leeward Islands | Accession | 04/04/1925 | |
| Malay States, Federated | Accession | 01/08/1935 | |
| Malay States, Unfederated | Accession | 01/08/1935 | |
| Malta | Accession | 04/04/1925 | |
| Mauritius | Accession | 04/04/1925 | |
| Montserrat | |||
| Nigeria | Accession | 22/01/1925 | |
| North Borneo | Accession | 13/05/1929 | |
| Northern Rhodesia | Accession | 15/09/1925 | |
| Nyasaland | Accession | 22/01/1925 | |
| Palestine | Accession | 19/06/1924 | |
| POLAND | |||
| Sarawak | Accession | 01/08/1935 | |
| Seychelles | Accession | 22/01/1925 | |
| Sierra Leone | Accession | 22/01/1925 | |
| Somaliland Protectorate | Accession | 22/06/1925 | |
| Southern Rhodesia | Accession | 02/07/1928 | |
| Straits Settlements | Accession | 29/05/1926 | |
| Tanganyika | Extension | 22/01/1925 | |
| The Gambia | Accession | 04/04/1925 | |
| Trinidad And Tobago | Accession | 22/01/1925 | |
| Turks And Caicos Islands | |||
| Uganda | Accession | 22/01/1925 | |
| UNITED KINGDOM | Signature | 26/11/1923 | |
| UNITED KINGDOM | Ratification | 30/06/1924 | |
| Windward Islands | Accession | 22/01/1925 | |
| Zanzibar | Extension | 29/12/1936 | |
| Zanzibar | Accession | 29/12/1936 |