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In accordance with Article 23 (a) of the Treaty of Peace with Japan, the Treaty entered into force initially on 28 April 1952. The final state in which the Treaty entered into force with respect to was Laos on 20 June 1952.
| PARTICIPANT | Ratification | Entry into Force |
| Argentina | 09.04.1952 | 28.04.1952 |
| Australia | 10.04.1952 | 28.04.1952 |
| Belgium | ||
| Bolivia | ||
| Brazil | 20.05.1952 | 20.05.1952 |
| Cambodia | 02.06.1952 | 02.06.1952 |
| Canada | 17.04.1952 | 28.04.1952 |
| Ceylon | 28.04.1952 | 28.04.1952 |
| Chile | ||
| Colombia | ||
| Costa Rica | ||
| Cuba | ||
| Dominican Republic | 06.06.1952 | 06.06.1952 |
| Ecuador | ||
| Egypt | ||
| El Salvador (ratification with Declarations) | 06.05.1952 | 06.05.1952 |
| Ethiopia | 12.06.1952 | 12.06.1952 |
| France | 18.04.1952 | 28.04.1952 |
| Greece | ||
| Guatemala | ||
| Haiti | ||
| Honduras | ||
| Indonesia | ||
| Iran | ||
| Iraq | ||
| Japan | 28.11.1951 | 28.04.1952 |
| Laos | 20.06.1952 | 20.06.1952 |
| Lebanon | ||
| Liberia | ||
| Grand Duchy of Luxembourg | ||
| Mexico | 03.03.1952 | 28.04.1952 |
| Netherlands | 17.06.1952 | 17.06.1952 |
| New Zealand | 10.04.1952 | 28.04.1952 |
| Nicaragua | ||
| Norway | 19.06.1952 | 19.06.1952 |
| Pakistan | 17.04.1952 | 28.04.1952 |
| Panama | ||
| Peru | 17.06.1952 | 17.06.1952 |
| Philippines | ||
| Saudi Arabia | ||
| Union of South Africa | ||
| Syria | ||
| Turkey | ||
| United Kingdom of Great Britain and Northern Ireland | 03.01.1952 | 03.01.1952 |
| United States of America (ratification with Declaration) | 28.04.1952 | 28.04.1952 |
| Uruguay | ||
| Venezuela | 20.06.1952 | 20.06.1952 |
| Viet Nam | 18.06.1952 | 20.06.1952 |
Source: United Nations Treaty Series 1952 (reg. no. 1832)