Member state Joined Population Muslim percentage Area (km2) Languages Notes Afghanistan -- Islamic Republic of Afghanistan Capital: Kabul A 1969 A 7007255001000000000 ♠ 25,500,100 99.7 A 7005652230000000000 ♠ 652,230 A Dari Pashto hide Further details Suspended 1980 - March 1989. Algeria -- People 's Democratic Republic of Algeria Capital: Algiers A 1969 A 7007387000000000000 ♠ 38,700,000 97.9 A 7006238174100000000 ♠ 2,381,741 A Arabic Tamazight Chad -- Republic of Chad Capital: N'Djamena A 1969 A 7007132110000000000 ♠ 13,211,000 55.3 A 7006128400000000000 ♠ 1,284,000 A Arabic French Egypt -- Arab Republic of Egypt Capital: Cairo A 1969 A 7007867481000000000 ♠ 86,748,100 94.9 A 7006100245000000000 ♠ 1,002,450 A Arabic hide Further details Suspended May 1979 - March 1984 after signing a peace treaty with Israel. Guinea -- Republic of Guinea Capital: Conakry A 1969 A 7007108242000000000 ♠ 10,824,200 84.4 A 7005245857000000000 ♠ 245,857 A French Indonesia -- Republic of Indonesia Capital: Jakarta A 1969 A 7008252164800000000 ♠ 252,164,800 87.2 A 7006190456900000000 ♠ 1,904,569 A Bahasa Indonesia hide Further details Indonesia has five provinces with official special autonomy status: Aceh, Jakarta SCR, Yogyakarta SR, Papua, and West Papua. Iran -- Islamic Republic of Iran Capital: Tehran A 1969 A 7007775570000000000 ♠ 77,557,000 99.5 A 7006164819500000000 ♠ 1,648,195 A Persian Jordan -- Hashemite Kingdom of Jordan Capital: Amman A 1969 A 7006660296000000000 ♠ 6,602,960 97.2 A 7004893420000000000 ♠ 89,342 A Arabic Kuwait -- State of Kuwait Capital: Kuwait City A 1969 A 7006306585000000000 ♠ 3,065,850 74.1 A 7004178180000000000 ♠ 17,818 A Arabic Lebanon -- Lebanese Republic Capital: Beirut A 1969 A 7006496600000000000 ♠ 4,966,000 61.3 A 7004104520000000000 ♠ 10,452 A Arabic Libya -- State of Libya Capital: Tripoli A 1969 A 7006625300000000000 ♠ 6,253,000 96.6 A 7006175954000000000 ♠ 1,759,540 A Arabic Malaysia Capital: Kuala Lumpur A 1969 A 7007301800000000000 ♠ 30,180,000 63.7 A 7005330803000000000 ♠ 330,803 A Bahasa Melayu hide Further details Malaysia is a federation of 13 states and three federal territories. Mali -- Republic of Mali Capital: Bamako A 1969 A 7007157680000000000 ♠ 15,768,000 94.4 A 7006124019200000000 ♠ 1,240,192 A French hide Further details Mali is a republic constituted by 8 regions. Mauritania -- Islamic Republic of Mauritania Capital: Nouakchott A 1969 A 7006346104100000000 ♠ 3,461,041 99.1 A 7006103070000000000 ♠ 1,030,700 A Arabic Morocco -- Kingdom of Morocco Capital: Rabat A 1969 A 7007333094000000000 ♠ 33,309,400 99.9 A 7005446550000000000 ♠ 446,550 A Arabic Tamazight hide Further details Morocco claims sovereignty over Western Sahara and controls most of it, which is disputed by the Sahrawi Arab Democratic Republic. Niger -- Republic of Niger Capital: Niamey A 1969 A 7007171387070000000 ♠ 17,138,707 98.4 A 7006126700000000000 ♠ 1,267,000 A French Pakistan -- Islamic Republic of Pakistan Capital: Islamabad A 1969 A 7008207774520000000 ♠ 207,774,520 96.4 A 7005881912000000000 ♠ 881,912 A Urdu Punjabi English hide Further details Pakistan is a federation of four provinces, 1 capital territory, and tribal regions. Pakistan disputes Indian sovereignty over Kashmir. It exercises control over some areas, but does not explicitly claim any part of it, instead regarding it as a disputed territory. The portions that it controls are divided into two polities, administered separately from Pakistan proper: Azad Kashmir Gilgit -- Baltistan Palestine -- State of Palestine Capital: Jerusalem (claims), Ramallah (administrative), Gaza City (administrative) A 1969 A 7006442054900000000 ♠ 4,420,549 97.6 A 7003622000000000000 ♠ 6,220 A Arabic hide Further details The declared State of Palestine has received diplomatic recognition from 137 states. The proclaimed state has no agreed territorial borders, or effective control on much of the territory that it proclaimed. The Palestinian National Authority is an interim administrative body formed as a result of the Oslo Accords that exercises limited autonomous jurisdiction within the Palestinian territories. In foreign relations, Palestine is represented by the Palestine Liberation Organization. The State of Palestine is a member state of UNESCO, and an observer state in the UN. Saudi Arabia -- Kingdom of Saudi Arabia Capital: Riyadh A 1969 A 7007299942720000000 ♠ 29,994,272 93.0 A 7006214969000000000 ♠ 2,149,690 A Arabic Senegal -- Republic of Senegal Capital: Dakar A 1969 A 7007128736010000000 ♠ 12,873,601 96.4 A 7005196722000000000 ♠ 196,722 A French Somalia -- Federal Republic of Somalia Capital: Mogadishu A 1969 A 7007108060000000000 ♠ 10,806,000 99.8 A 7005637657000000000 ♠ 637,657 A Arabic Somali hide Further details Following the adoption of the Provisional Federal Constitution in August 2012, Somalia is a federation, the Federal Republic of Somalia, which is divided into several Federal Member States. Sudan -- Republic of the Sudan Capital: Khartoum A 1969 A 7007372894060000000 ♠ 37,289,406 90.7 A 7006188606800000000 ♠ 1,886,068 A Arabic English hide Further details Sudan is a federation of 17 states. Disputes Abyei and Kafia Kingi with South Sudan. Tunisia -- Republic of Tunisia Capital: Tunis A 1969 A 7007108865000000000 ♠ 10,886,500 99.5 A 7005163610000000000 ♠ 163,610 A Arabic Turkey -- Republic of Turkey Capital: Ankara A 1969 A 7007766678640000000 ♠ 76,667,864 98.0 A 7005783562000000000 ♠ 783,562 A Turkish hide Further details Transcontinental country in Europe and Asia, classified as West Asian countries by the United Nations Statistics Division: Turkey Yemen -- Republic of Yemen Capital: Sana'a A 1969 A 7007252350000000000 ♠ 25,235,000 99.1 A 7005527968000000000 ♠ 527,968 A Arabic hide Further details Joined separately as North Yemen and South Yemen. Both unified in 1990. Bahrain -- Kingdom of Bahrain Capital: Manama A 1970 A 7006123457100000000 ♠ 1,234,571 70.3 A 7002765000000000000 ♠ 765 A Arabic Oman -- Sultanate of Oman Capital: Muscat A 1970 A 7006402000000000000 ♠ 4,020,000 85.9 A 7005309500000000000 ♠ 309,500 A Arabic Qatar -- State of Qatar Capital: Doha A 1970 A 7006217403500000000 ♠ 2,174,035 67.7 A 7004115860000000000 ♠ 11,586 A Arabic Syria -- Syrian Arab Republic Capital: Damascus A 1970 A 7007219870000000000 ♠ 21,987,000 92.8 A 7005185180000000000 ♠ 185,180 A Arabic hide Further details The Syrian National Coalition, which is recognized as the legitimate representative of the Syrian people by 20 UN members, has established an interim government to rule rebel controlled territory during the Syrian civil war. Syria has one self - declared autonomous region: Syrian Kurdistan Suspended in August 2012 during the Syrian civil war. United Arab Emirates Capital: Abu Dhabi A 1971 A 7006944600000000000 ♠ 9,446,000 76.9 A 7004836000000000000 ♠ 83,600 A Arabic hide Further details The United Arab Emirates is a federation of seven emirates. Sierra Leone -- Republic of Sierra Leone Capital: Freetown A 1972 A 7006619028000000000 ♠ 6,190,280 78.0 A 7004717400000000000 ♠ 71,740 A English Bangladesh -- People 's Republic of Bangladesh Capital: Dhaka A 7008156569000000000 ♠ 156,569,000 90.4 A 7005147570000000000 ♠ 147,570 A Bengali Gabon -- Gabonese Republic Capital: Libreville A 7006171100000000000 ♠ 1,711,000 11.2 A 7005267668000000000 ♠ 267,668 A French Gambia Gambia, The -- Republic of the Gambia Capital: Banjul A 7006188245000000000 ♠ 1,882,450 95.1 A 7004112950000000000 ♠ 11,295 A English Guinea - Bissau -- Republic of Guinea - Bissau Capital: Bissau A 7006174600000000000 ♠ 1,746,000 45.1 A 7004361250000000000 ♠ 36,125 A Portuguese Uganda -- Republic of Uganda Capital: Kampala A 7007353570000000000 ♠ 35,357,000 11.5 A 7005241550000000000 ♠ 241,550 A English Swahili Burkina Faso Capital: Ouagadougou A 7007181055700000000 ♠ 18,105,570 61.6 A 7005241550000000000 ♠ 241,550 A French Cameroon -- Republic of Cameroon Capital: Yaoundé A 7007353570000000000 ♠ 35,357,000 18.3 A 7005241550000000000 ♠ 241,550 A French English Comoros -- Union of the Comoros Capital: Moroni A 1976 A 7005743798000000000 ♠ 743,798 98.3 A 7003186200000000000 ♠ 1,862 A Comorian French Arabic hide Further details Comoros is a federation of 3 islands. Iraq -- Republic of Iraq Capital: Baghdad A 1976 A 7007360045520000000 ♠ 36,004,552 99.0 A 7005438317000000000 ♠ 438,317 A Arabic Kurdish hide Further details Iraq is a federation of 18 governorates, three of which make up the autonomous: Iraqi Kurdistan. Maldives -- Republic of Maldives Capital: Malé A 1976 A 7005317280000000000 ♠ 317,280 98.4 A 7002300000000000000 ♠ 300 A Dhivehi Djibouti -- Republic of Djibouti Capital: Djibouti A 1978 A 7005886000000000000 ♠ 886,000 96.9 A 7004232000000000000 ♠ 23,200 A Arabic French Benin -- Republic of Benin Capital: Porto - Novo A 1982 A 7006998806800000000 ♠ 9,988,068 23.8 A 7005112622000000000 ♠ 112,622 A French Brunei -- Negara Brunei Darussalam Capital: Bandar Seri Begawan A 1984 A 7005393162000000000 ♠ 393,162 75.1 A 7003576500000000000 ♠ 5,765 A Malay hide Further details Brunei is a nation constituted by 4 districts. Nigeria -- Federal Republic of Nigeria Capital: Abuja A 1986 A 7008178517000000000 ♠ 178,517,000 48.8 A 7005923768000000000 ♠ 923,768 A English hide Further details Nigeria is a federation of 36 states and 1 federal territory. Azerbaijan -- Republic of Azerbaijan Capital: Baku A 1991 A 7006947710000000000 ♠ 9,477,100 96.9 A 7004866000000000000 ♠ 86,600 A Azerbaijani hide Further details Azerbaijan contains two autonomous regions, Nakhchivan and Nagorno - Karabakh (Dağlıq Qarabağ). Transcontinental country in Europe and Asia, classified as West Asian countries by the United Nations Statistics Division: Azerbaijan Albania -- Republic of Albania Capital: Tirana A 1992 A 7006282197700000000 ♠ 2,821,977 56.7 A 7004287480000000000 ♠ 28,748 A Albanian hide Further details Albania is a republic constituted by 12 counties. Kyrgyzstan -- Kyrgyz Republic Capital: Bishkek A 1992 A 7006577657000000000 ♠ 5,776,570 88.0 A 7005199951000000000 ♠ 199,951 A Kyrgyz Russian Tajikistan -- Republic of Tajikistan Capital: Dushanbe A 1992 A 7006816000000000000 ♠ 8,160,000 96.7 A 7005143100000000000 ♠ 143,100 A Tajiki hide Further details Tajikistan contains 1 autonomous region, Gorno - Badakhshan Autonomous Province. Turkmenistan Capital: Ashgabat A 1992 A 7006530700000000000 ♠ 5,307,000 93.0 A 7005488100000000000 ♠ 488,100 A Turkmen Mozambique -- Republic of Mozambique Capital: Maputo A 1994 A 7007237007150000000 ♠ 23,700,715 18.0 A 7005801590000000000 ♠ 801,590 A Portuguese Kazakhstan -- Republic of Kazakhstan Capital: Astana A 1995 A 7007172440000000000 ♠ 17,244,000 70.4 A 7006272490000000000 ♠ 2,724,900 A Kazakh Russian hide Further details Transcontinental country in Europe and Asia, classified as West Asian countries by the United Nations Statistics Division: Kazakhstan Uzbekistan -- Republic of Uzbekistan Capital: Tashkent A 1995 A 7007304928000000000 ♠ 30,492,800 96.7 A 7005447400000000000 ♠ 447,400 A Uzbek hide Further details Uzbekistan contains 1 autonomous region: Karakalpakstan. Suriname -- Republic of Suriname Capital: Paramaribo A 7005534189000000000 ♠ 534,189 15.2 A 7005163820000000000 ♠ 163,820 A Dutch Togo -- Togolese Republic Capital: Lomé A 1997 A 7006699300000000000 ♠ 6,993,000 14.0 A 7004567850000000000 ♠ 56,785 A French Guyana -- Co-operative Republic of Guyana Capital: Georgetown A 1998 A 7005784894000000000 ♠ 784,894 06.4 A 7005214969000000000 ♠ 214,969 A English Ivory Coast -- Republic of Côte d'Ivoire Capital: Yamoussoukro A 7007232020000000000 ♠ 23,202,000 37.5 A 7005322463000000000 ♠ 322,463 A French
when did nigeria became a member of oic
1986