As of September 2025, the International Society on MCDM has 2501 members from 106 countries. Top five memberships are from India, United States, Turkey, Brazil and Spain, accounting for 1047 of all members. There are five or fewer members from 53 countries. The color of each country on the map below varies in darkness depending on the number of members in that country. The exact membership sizes are given by Country in the table following the map.
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| Country | Members |
| India | 421 |
| United States | 196 |
| Turkey | 173 |
| Brazil | 141 |
| Spain | 116 |
| China | 94 |
| Iran | 93 |
| United Kingdom | 80 |
| Italy | 69 |
| Canada | 68 |
| Germany | 66 |
| Portugal | 64 |
| France | 60 |
| Finland | 52 |
| Taiwan | 50 |
| Poland | 43 |
| Greece | 37 |
| Netherlands | 34 |
| Malaysia | 34 |
| Colombia | 32 |
| Indonesia | 31 |
| Russia | 28 |
| Nigeria | 26 |
| Belgium | 26 |
| Mexico | 25 |
| Australia | 24 |
| Algeria | 24 |
| Sweden | 18 |
| South Korea | 17 |
| Tunisia | 17 |
| Denmark | 15 |
| Switzerland | 14 |
| Saudi Arabia | 14 |
| Austria | 13 |
| Czech Republic | 13 |
| Serbia | 13 |
| Romania | 12 |
| Thailand | 12 |
| Egypt | 11 |
| New Zealand | 11 |
| Japan | 10 |
| Pakistan | 10 |
| South Africa | 10 |
| Chile | 9 |
| Hungary | 9 |
| Morocco | 9 |
| Hong Kong S.A.R., China | 9 |
| Nepal | 8 |
| Argentina | 7 |
| Ireland | 7 |
| Israel | 7 |
| Cuba | 6 |
| Bangladesh | 6 |
| Belarus | 5 |
| Bulgaria | 5 |
| Croatia | 5 |
| Lithuania | 5 |
| United Arab Emirates | 5 |
| Oman | 5 |
| Norway | 4 |
| Ukraine | 4 |
| Slovenia | 4 |
| Georgia | 3 |
| Latvia | 3 |
| Libya | 3 |
| Philippines | 3 |
| Ethiopia | 3 |
| Bahrain | 2 |
| Ghana | 2 |
| Iraq | 2 |
| Jordan | 2 |
| Kenya | 2 |
| Kuwait | 2 |
| Peru | 2 |
| Singapore | 2 |
| Sudan | 2 |
| Vietnam | 2 |
| Sri Lanka | 2 |
| Afghanistan | 1 |
| Armenia | 1 |
| Bahamas | 1 |
| Benin | 1 |
| Bosnia and Herzegovina | 1 |
| Ecuador | 1 |
| Estonia | 1 |
| Guatemala | 1 |
| Iceland | 1 |
| Kazakhstan | 1 |
| Lebanon | 1 |
| Luxembourg | 1 |
| Macedonia | 1 |
| Mauritius | 1 |
| Mongolia | 1 |
| Montenegro | 1 |
| Myanmar | 1 |
| Namibia | 1 |
| Palestinian Territory | 1 |
| Panama | 1 |
| Papua New Guinea | 1 |
| Qatar | 1 |
| Senegal | 1 |
| Sierra Leone | 1 |
| Slovakia | 1 |
| Tanzania | 1 |
| Venezuela | 1 |
| Vietnam | 1 |
| TOTAL | 2501 |