A cikin shekarar da aka kafa, wasu kasashe shida sun shiga, biyu daga cikinsu sun kasance mambobi ne a duk lokacin da aka kafa kungiyar. A karkashin Jamhuriyar Weimar, Jamus (a zahiri Deutsches Reich ko Daular Jamus) an shigar da ita cikin kungiyar ta Majalisar Dinkin Duniya ta hanyar wani kuduri da aka zartar a ranar 8 ga Satumba, 1926. Ƙarin kasashe 15 sun shiga daga baya. Mafi yawan ƙasashe membobin sun kasance 58, tsakanin 28 ga Satumba, 1934 (lokacin da Ecuador ya shiga) da 23 ga Fabrairu, 1935 (lokacin da Paraguay ya janye). A ranar 26 ga Mayu, 1937, Misira ta zama memba na ƙarshe da ya shiga kungiyar. Memba na farko da ya janye daga kungiyar ya kasance a ranar 22 ga Janairu, 1925; Costa Rica ya shiga ranar 16 ga watan Janairu, 1920, wannan kuma ya sa ya zama memba na farko da ya janye da sauri. Brazil ce ta fara janyewa a watan Yuni, 1926), kuma biyu daga cikinsu sun kasance mambobi ne a duk lokacin da kungiyar ta wanzu.
Shekara ta 1946