| Country | Action | Action Date | Effective Date |
|---|
| Aden Colony | Extension | 23/06/1960 | |
| AFGHANISTAN | Signature | 03/10/1957 | |
| ALBANIA | Signature | 03/10/1957 | |
| ALBANIA | Ratification | 14/09/1959 | |
| Algeria | Extension | 08/05/1959 | |
| Antilles | Extension | 27/08/1959 | |
| ARGENTINE REPUBLIC | Signature | 03/10/1957 | |
| ARGENTINE REPUBLIC | Ratification | 15/04/1959 | |
| AUSTRIA | Signature | 03/10/1957 | |
| AUSTRIA | Ratification | 04/05/1959 | |
| Bahamas | Extension | 23/06/1960 | |
| BELGIUM | Signature | 03/10/1957 | |
| BELGIUM | Ratification | 11/09/1962 | |
| Bermuda | Extension | 23/06/1960 | |
| BOLIVIA | Signature | 03/10/1957 | |
| BRAZIL | Signature | 03/10/1957 | |
| BRAZIL | Ratification | 26/01/1965 | |
| British Guiana | Extension | 23/06/1960 | |
| British Honduras | Extension | 23/06/1960 | |
| British Virgin Islands | Extension | 23/06/1960 | |
| Brunei | Extension | 23/06/1960 | |
| BULGARIA | Signature | 03/10/1957 | |
| BULGARIA | Ratification | 13/05/1959 | |
| BURMA | Accession | 24/07/1961 | |
| BURUNDI | Accession | 06/04/1963 | |
| BYELORUSSIA S S R | Signature | 03/10/1957 | |
| BYELORUSSIA S S R | Ratification | 23/04/1959 | |
| CAMBODIA | Signature | 03/10/1957 | |
| CAMBODIA | Ratification | 12/01/1960 | |
| CAMEROON | Accession | 26/06/1961 | |
| CENTRAL AFRICAN REPUBLIC | Accession | 21/08/1961 | |
| CEYLON | Signature | 03/10/1957 | |
| CEYLON | Ratification | 16/11/1959 | |
| CHAD | Accession | 23/06/1961 | |
| CHILE | Signature | 03/10/1957 | |
| COLOMBIA | Signature | 03/10/1957 | |
| COLOMBIA | Ratification | 05/04/1963 | |
| Comoro Islands | Extension | 08/05/1959 | |
| CONGO | Signature | 03/10/1957 | |
| CONGO | Accession | 05/07/1961 | |
| CONGO | Ratification | 20/09/1961 | |
| COSTA RICA | Signature | 03/10/1957 | |
| CUBA | Signature | 03/10/1957 | |
| CUBA | Ratification | 31/10/1962 | |
| Cyprus | Extension | 23/06/1960 | |
| CYPRUS | Accession | 09/07/1962 | |
| CZECHOSLOVAKIA | Signature | 03/10/1957 | |
| CZECHOSLOVAKIA | Ratification | 13/08/1959 | |
| DAHOMEY | Accession | 27/04/1961 | |
| DENMARK | Signature | 03/10/1957 | |
| DENMARK | Ratification | 13/08/1958 | |
| DOMINICAN REPUBLIC | Signature | 03/10/1957 | |
| DOMINICAN REPUBLIC | Ratification | 28/12/1962 | |
| ECUADOR | Signature | 03/10/1957 | |
| ECUADOR | Ratification | 25/05/1962 | |
| EGYPT | Signature | 03/10/1957 | |
| EGYPT | Ratification | 15/01/1959 | |
| ETHIOPIA | Signature | 03/10/1957 | |
| Falkland Island Dependencies | Extension | 23/06/1960 | |
| Fiji | Extension | 23/06/1960 | |
| FINLAND | Signature | 03/10/1957 | |
| FRANCE | Signature | 03/10/1957 | |
| FRANCE | Ratification | 08/05/1959 | |
| French Cameroons | Extension | 08/05/1959 | |
| French O/seas Postal & Telecom Office Terr. | Extension | 08/05/1959 | |
| French Polynesia | Extension | 08/05/1959 | |
| French Somaliland | Extension | 08/05/1959 | |
| French Togoland | Extension | 08/05/1959 | |
| GABON | Accession | 17/07/1961 | |
| GERMANY FEDERAL REPUBLIC | Signature | 03/10/1957 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 30/08/1960 | |
| GHANA | Accession | 24/10/1960 | |
| Gibraltar | Extension | 23/06/1960 | |
| GREECE | Signature | 03/10/1957 | |
| GREECE | Ratification | 02/10/1959 | |
| GUATEMALA | Signature | 03/10/1957 | |
| GUATEMALA | Ratification | 03/09/1963 | |
| GUINEA | Accession | 06/08/1959 | |
| HAITI | Signature | 03/10/1957 | |
| HONDURAS | Signature | 03/10/1957 | |
| HONDURAS | Ratification | 21/12/1962 | |
| Hong Kong | Extension | 23/06/1960 | |
| HUNGARY | Signature | 03/10/1957 | |
| HUNGARY | Ratification | 05/04/1960 | |
| ICELAND | Signature | 03/10/1957 | |
| ICELAND | Ratification | 27/11/1958 | |
| INDIA | Signature | 03/10/1957 | |
| INDIA | Ratification | 21/12/1959 | |
| INDONESIA | Signature | 03/10/1957 | |
| INDONESIA | Ratification | 30/11/1961 | |
| IRAN | Signature | 03/10/1957 | |
| IRAN | Ratification | 09/10/1964 | |
| IRAQ | Signature | 03/10/1957 | |
| IRAQ | Ratification | 18/01/1960 | |
| IRELAND, REPUBLIC OF | Signature | 03/10/1957 | |
| IRELAND, REPUBLIC OF | Ratification | 19/06/1961 | |
| ITALY | Signature | 03/10/1957 | |
| ITALY | Ratification | 09/06/1960 | |
| IVORY COAST | Accession | 23/05/1961 | |
| JAMAICA | Accession | 29/08/1963 | |
| JAPAN | Signature | 03/10/1957 | |
| JAPAN | Ratification | 07/11/1958 | |
| JORDAN | Signature | 03/10/1957 | |
| JORDAN | Ratification | 02/03/1959 | |
| Kenya | Extension | 23/06/1960 | |
| KENYA | Accession | 27/10/1964 | |
| KOREA REPUBLIC OF | Signature | 03/10/1957 | |
| KOREA REPUBLIC OF | Ratification | 14/03/1960 | |
| KUWAIT | Accession | 07/06/1960 | |
| Land Berlin | Extension | 30/08/1960 | |
| LAOS | Signature | 03/10/1957 | |
| LAOS | Ratification | 24/01/1964 | |
| LEBANON | Signature | 03/10/1957 | |
| LEBANON | Ratification | 23/07/1958 | |
| LIBERIA | Signature | 03/10/1957 | |
| LIBYA | Signature | 03/10/1957 | |
| LIECHTENSTEIN | Accession | 13/04/1962 | |
| LUXEMBOURG | Signature | 03/10/1957 | |
| LUXEMBOURG | Ratification | 13/01/1960 | |
| MALAGASY REPUBLIC | Accession | 02/11/1961 | |
| MALAYA | Accession | 13/03/1959 | |
| MALI | Accession | 18/08/1961 | |
| Malta | Extension | 23/06/1960 | |
| MALTA | Accession | 21/05/1965 | |
| Mauritius | Extension | 23/06/1960 | |
| MEXICO | Signature | 03/10/1957 | |
| MEXICO | Ratification | 19/03/1959 | |
| MONACO | Signature | 03/10/1957 | |
| MONACO | Ratification | 02/09/1959 | |
| MONGOLIA | Accession | 24/08/1963 | |
| MOROCCO | Signature | 03/10/1957 | |
| MOROCCO | Ratification | 09/07/1959 | |
| NETHERLANDS THE | Signature | 03/10/1957 | |
| NETHERLANDS THE | Ratification | 27/08/1959 | |
| New Caledonia And Dependences | Extension | 08/05/1959 | |
| New Guinea | Extension | 27/08/1959 | |
| NEW ZEALAND | Accession | 28/11/1963 | |
| NICARAGUA | Signature | 03/10/1957 | |
| NICARAGUA | Ratification | 05/12/1961 | |
| NIGER | Accession | 12/06/1961 | |
| Nigeria | Extension | 23/06/1960 | |
| NIGERIA | Accession | 30/08/1961 | |
| North Borneo | Extension | 23/06/1960 | |
| NORWAY | Signature | 03/10/1957 | |
| NORWAY | Ratification | 19/08/1958 | |
| PAKISTAN | Signature | 03/10/1957 | |
| PAKISTAN | Ratification | 08/10/1959 | |
| PANAMA | Signature | 03/10/1957 | |
| PARAGUAY | Signature | 03/10/1957 | |
| PERU | Signature | 03/10/1957 | |
| PERU | Ratification | 21/05/1959 | |
| POLAND | Signature | 03/10/1957 | |
| POLAND | Ratification | 23/02/1961 | |
| PORTUGAL | Signature | 03/10/1957 | |
| PORTUGAL | Ratification | 12/07/1961 | |
| Portugal, Provinces In West Africa | Signature | 03/10/1957 | |
| Portugal, Provinces In West Africa | Ratification | 12/07/1961 | |
| Provs in E.Africa, Asia and Oceania | Signature | 03/10/1957 | |
| Provs in E.Africa, Asia and Oceania | Ratification | 12/07/1961 | |
| Rhodesia And Nyasaland | Extension | 23/06/1960 | |
| ROUMANIA | Signature | 03/10/1957 | |
| ROUMANIA | Ratification | 25/10/1964 | |
| RWANDA | Accession | 06/04/1963 | |
| SALVADOR | Signature | 03/10/1957 | |
| SALVADOR | Ratification | 01/11/1961 | |
| SAN MARINO | Signature | 03/10/1957 | |
| SAN MARINO | Ratification | 31/03/1959 | |
| Sarawak | Extension | 23/06/1960 | |
| SAUDI ARABIA | Signature | 03/10/1957 | |
| SAUDI ARABIA | Ratification | 06/03/1961 | |
| SENEGAL | Accession | 14/06/1961 | |
| Seychelles | Extension | 23/06/1960 | |
| Sierra Leone | Extension | 23/06/1960 | |
| SIERRA LEONE | Accession | 15/05/1964 | |
| Singapore | Extension | 23/06/1960 | |
| SOMALIA | Signature | 03/10/1957 | |
| SOMALIA | Ratification | 16/11/1960 | |
| Somaliland Protectorate | Extension | 23/06/1960 | |
| SOVIET UNION | Signature | 03/10/1957 | |
| SOVIET UNION | Ratification | 23/04/1959 | |
| SPAIN | Signature | 03/10/1957 | |
| SPAIN | Ratification | 29/07/1959 | |
| Spain, Territories In Africa | Extension | 29/07/1959 | |
| St Helena | Extension | 23/06/1960 | |
| St Pierre and Miquelon | Extension | 08/05/1959 | |
| SUDAN | Signature | 03/10/1957 | |
| SUDAN | Ratification | 01/03/1960 | |
| Surinam | Extension | 27/08/1959 | |
| SWEDEN | Signature | 03/10/1957 | |
| SWEDEN | Ratification | 02/05/1958 | |
| SWITZERLAND | Signature | 03/10/1957 | |
| SWITZERLAND | Ratification | 14/11/1958 | |
| SYRIA | Signature | 03/10/1957 | |
| TAIWAN | Signature | 03/10/1957 | |
| TAIWAN | Ratification | 06/10/1959 | |
| Tanganyika | Extension | 23/06/1960 | |
| TANGANYIKA | Accession | 29/03/1963 | |
| THAILAND | Signature | 03/10/1957 | |
| THAILAND | Ratification | 21/07/1960 | |
| The Gambia | Extension | 23/06/1960 | |
| TOGO | Succession | 21/03/1962 | |
| Tonga | Extension | 23/06/1960 | |
| TRINIDAD AND TOBAGO | Accession | 15/06/1963 | |
| TRINIDAD AND TOBAGO | Reservation | 15/06/1963 | |
| TUNISIA | Signature | 03/10/1957 | |
| TURKEY | Signature | 03/10/1957 | |
| TURKEY | Ratification | 14/07/1961 | |
| Uganda | Extension | 23/06/1960 | |
| UGANDA | Accession | 07/08/1964 | |
| UKRAINE | Signature | 03/10/1957 | |
| UKRAINE | Ratification | 05/05/1959 | |
| UNITED KINGDOM | Signature | 03/10/1957 | |
| UNITED KINGDOM | Ratification | 17/07/1959 | |
| UPPER VOLTA | Accession | 29/03/1963 | |
| URUGUAY | Signature | 03/10/1957 | |
| VATICAN CITY | Signature | 03/10/1957 | |
| VATICAN CITY | Ratification | 13/04/1960 | |
| VENEZUELA | Signature | 03/10/1957 | |
| VENEZUELA | Ratification | 28/02/1964 | |
| VIETNAM | Signature | 03/10/1957 | |
| VIETNAM | Ratification | 03/12/1959 | |
| West Indies | Extension | 23/06/1960 | |
| Western Pacific High Commsn Territories | Extension | 23/06/1960 | |
| YEMEN | Accession | 03/04/1959 | |
| YUGOSLAVIA | Signature | 03/10/1957 | |
| YUGOSLAVIA | Ratification | 15/04/1959 | |
| Zanzibar | Extension | 23/06/1960 | |