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| Albania (August 31st, 1929) |
| Belgium (May 9th, 1929) |
| Great Britain and Northern Ireland [January 9th, 1929 a] Does not include any of His Britannic Majesty's Colonies, Protectorates or territories under suzerainty or mandate. Burma 2 |
| New Zealand [December 22nd, 1928 a] On the understanding that no contribution to the initial fund of the Union will fall due by New Zealand before the commencement of the next financial year in that country, viz., April 1st, 1929. |
| India [April 2nd, 1929] |
| Bulgaria (May 22nd, 1931) |
| China 3 (May 29th, 1935 a) |
| Cuba [June 18th, 1934] |
| Czechoslovakia4,5 ,[^e]; (August 20th, 1931) |
| Ecuador (July 30th, 1928) |
| Egypt [August 7th, 1928] Subject to later acceptance by the Egyptian Government of the decisions of the Executive Committee fixing its contribution. |
| Finland (April 10th, 1929) |
| France (April 27th, 1932) |
| Germany (July 22nd, 1929) |
| Greece [January 16th, 1931] |
| Hungary (April 17th, 1929) It being understood that "the most extensive immunities, facilities and exemptions" mentioned in Article 10 of the present Convention shall not include exterritoriality or the other rights and immunities enjoyed in Hungary by duly accredited diplomatic agents. |
| Iran (September 28th, 1932 a) |
| Iraq4 (June 12th, 1934 a) |
| Italy (August 2nd, 1928) Applies also to the Italian Colonies. |
| Luxembourg [June 27th, 1929 a] |
| Monaco (May 21st, 1929) |
| Poland (July 11th, 1930) |
| Romania [September 11th, 1928] |
| San Marino (August 12th, 1929) |
| Sudan (May 11th, 1928 a) |
| Switzerland (January 2nd, 1930 a) |
| Turkey (March 10th, 1932) |
| Venezuela (June 19th, 1929) |
| Yugoslavia (former)4,6 [August 28th, 1931 a] |