* βeta
| Capital | (*) See Notes at bottom of the table | |||
| N | Flag | Member Countries | name | |
| 1 | Afghanistan | Kabul | ||
| 2 | Albania | Tirana | ||
| 3 | Algeria | Algiers | ||
| 4 | Azerbaijan | Baku | ||
| 5 | Bahrain | Manama | ||
| 6 | Bangladesh | Dhaka | ||
| 7 | Benin | Porto-Novo | ||
| 8 | Brunei | Bandar Seri Begawan | ||
| 9 | Burkina Faso | Ouagadougou | ||
| 10 | Cameroon | Yaounde | ||
| 11 | Chad | N'Djamena | ||
| 12 | Comoros | Moroni | ||
| 13 | Djibouti | Djibouti | ||
| 14 | Egypt | Cairo | ||
| 15 | Gabon | Libreville | ||
| 16 | Gambia | Banjul | ||
| 17 | Guinea | Conakry | ||
| 18 | Guinea-Bissau | Bissau | ||
| 19 | Indonesia | Jakarta | ||
| 20 | Iran | Tehran | ||
| 21 | Iraq | Baghdad | ||
| 22 | Ivory Coast | Yamoussoukro | ||
| 23 | Jordan | Amman | ||
| 24 | Kazakhstan | Astana | ||
| 25 | Kuwait | Kuwait City | ||
| 26 | Kyrgyzstan | Bishkek | ||
| 27 | Lebanon | Beirut | ||
| 28 | Libya | Tripoli | ||
| 29 | Malaysia | Kuala Lumpur | ||
| 30 | Maldives | Male | ||
| 31 | Mali | Bamako | ||
| 32 | Mauritania | Nouakchott | ||
| 33 | Morocco | Rabat | ||
| 34 | Mozambique | Maputo | ||
| 35 | Niger | Niamey | ||
| 36 | Nigeria | Abuja | ||
| 37 | Oman | Muscat | ||
| 38 | Pakistan | Islamabad | ||
| 39 | Qatar | Doha | ||
| 40 | Saudi Arabia | Riyadh | ||
| 41 | Senegal | Dakar | ||
| 42 | Sierra Leone | Freetown | ||
| 43 | Somalia | Mogadishu | ||
| 44 | Sudan | Khartoum | ||
| 45 | Suriname | Paramaribo | ||
| 46 | Syria | Damascus | ||
| 47 | Tajikistan | Dushanbe | ||
| 48 | Togo | Lome | ||
| 49 | Tunisia | Tunis | ||
| 50 | Turkey | Ankara | ||
| 51 | Turkmenistan | Ashgabat | ||
| 52 | Uganda | Kampala | ||
| 53 | United Arab Emirates | Abu Dhabi | ||
| 54 | Uzbekistan | Tashkent | ||
| 55 | Yemen | Sanaa | ||
| Abbreviation : IDB Title : Islamic Development Bank Aim : to promote Islamic economic aid and social development. Established in : 15 December 1973 by declaration of intent; effective - 12 August 1974 |
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| Capital name | ||||