Between 1920 and 1946, a total of 63 countries became member states of the League of Nations.
When the Assembly of the League of Nations first met, it consisted of 42 founding members.[1] A further 21 countries joined between then and the dissolution of the League.
As several countries withdrew from the League over its existence, the 63 countries were never all members at the same time. The League's greatest extent was from 28 September 1934 (when Ecuador joined) to February 1935 (when Paraguay withdrew) with 58 countries. At this time, only Costa Rica (December 1924), Brazil (June 1926), Japan (March 1933), and Germany (October 1933) had withdrawn, and only Egypt joined later (on 26 May 1937).