21 Members (excluding the associate or suspended members but including the countries represented on their behalf) [The rulers are not necessarily the representatives in the organisation. ] :
| | AUSTRIA | (Vienna) | | President Michael Hainisch | | |
| | BELGIUM | (Brussels) | | King Albert I | | |
| | BULGARIA | (Sofia) | | Tsar Boris III the Unifier | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Heinrich Haeberlin | | |
| | CZECHOSLOVAKIA | (Prague a + Lany s) | | President Tomas Garrigue Masaryk | | |
| | GERMANY | (Berlin a) | | Reichpresident Paul von Hindenburg | | |
| | DENMARK | (Copenhagen) | | King Christian X | | |
| | EGYPT | (Cairo a + Alexandria r) | | King Fuad I | | |
| | FINLAND | (Helsinki a + Kultaranta s) | | President Lauri Kristian Relander | | |
| | FRANCE | (Paris) | | Frederic Francois-Marsal | | |
| | GREECE | (Athens a) | | President Theodoros Pangalos Koundouriotis | | |
| | HUNGARY | (Budapest a) | | Regent Miklos Horthy de Nagybanya | | |
| | ITALY | (Rome a) | | King Victor Emmanuel III | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | Queen Wilhelmina | | |
| | POLAND | (Warsaw a) | | President Gabriel Narutowicz | | |
| | PORTUGAL | (Lisbon) | | President Bernardino Machado | | |
| | CHINA | (Peking) | | Tuan Chi-Jui | | |
| | RUMANIA | (Bucharest) | | King Ferdinand I | | |
| | SWEDEN | (Stockholm) | | King Gustav V | | |
| | AMERICA | (Washington-District of Columbia) | | President Calvin Coolidge | | |
| | JUGO-SLAVIA | (Belgrade) | | King Alexander I. the Unifier Karageorgevich | | |