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This is a list of 57 member states of the Organisation of Islamic Cooperation sorted by their estimated population.

10 countries (Benin, Cameroon, Gabon, Guinea-Bissau, Guyana, Ivory Coast, Mozambique, Suriname, Togo and Uganda) are not Muslim-majority, but they are members of Organisation of Islamic Cooperation.

Also the list below only includes OIC members, not OIC observers, and does not include many other countries having a significant number of Muslims in their resident population from immigrants and their descendants (notably in North America, Europe, and even in Asia, such as China, India and Russia which are OIC observers).

Syria is still listed here (as a founding member state), even if its membership is suspended since 2022 (other member states have also been suspended in the past but fully reintegrated a few years later in the OIC).

Total and Muslim population by OIC member state

Rank	OIC member state	Total population (all religions)	Percentage Muslim (est.)	Population Muslim (est.)
1	Indonesia	0,270,203,917 (2020)	87.2 %	235,617,816
2	Pakistan	0,241,499,431 (2023)	96.4 %	232,805,451
3	Nigeria	0,230,842,743 (2022)	50.4 %	116,344,742
4	Bangladesh	0,169,828,911 (2022)	89.8 %	152,506,362
5	Egypt	0,110,000,000 (2023)	94.9 %	104,390,000
6	Iran	0,087,590,873 (2023)	99.0 % plus	86,714,964
7	Turkey	0,085,372,377 (2023)	98.0 %	83,664,929
8	Sudan	0,049,197,555 (2022)	90.7 %	44,622,182
9	Uganda	0,047,729,952 (2023)	11.5 %	5,488,944
10	Algeria	0,045,400,000 (2020)	97.9 %	44,446,600
11	Iraq	0,041,266,109 (2023)	99.0 %	40,853,448
12	Afghanistan	0,039,232,003 (2023)	99.0 % plus	38,839,683
13	Morocco	0,037,984,655 (2022)	99.0 % plus	37,604,808
14	Uzbekistan	0,036,024,900 (2023)	96.7 %	34,836,078
15	Yemen	0,034,449,825 (2022)	99.0 % plus	34,105,327
16	Malaysia	0,034,219,975 (2023)	63.7 %	21,798,124
17	Mozambique	0,034,173,805 (2023)	18.0 %	6,151,285
18	Saudi Arabia	0,032,175,224 (2022)	93.0 %	29,922,958
19	Ivory Coast	0,030,900,000 (2023)	42.5 %	13,132,500
20	Cameroon	0,030,135,732 (2023)	18.3 %	5,514,839
21	Niger	0,025,396,840 (2023)	98.4 %	24,990,491
22	Syria	0,022,933,531 (2023)	92.8 %	21,282,317
23	Burkina Faso	0,022,489,126 (2023)	61.6 %	13,853,302
24	Mali	0,021,359,722 (2023)	92.4 %	19,736,383
25	Kazakhstan	0,020,000,000 (2023)	70.4 %	14,080,000
26	Chad	0,018,523,165 (2023)	55.3 %	8,678,212
27	Senegal	0,018,384,660 (2023)	96.4 %	17,722,812
28	Benin	0,014,219,908 (2023)	23.8 %	3,384,338
29	Guinea	0,014,190,612 (2023)	45.1 %	6,399,966
30	Somalia	0,012,693,796 (2023)	99.0 % plus	12,566,858
31	Tunisia	0,011,551,448 (2019)	99.0 % plus	11,435,934
32	Jordan	0,011,548,886 (2024)	97.2 %	11,225,517
33	Azerbaijan	0,010,420,515 (2023)	96.9 %	10,097,479
34	Tajikistan	0,010,077,600 (2023)	96.7 %	9,745,039
35	United Arab Emirates	0,009,282,410 (2023)	76.9 %	7,138,173
36	Sierra Leone	0,008,908,040 (2023)	78.0 %	6,948,271
37	Togo	0,008,703,961 (2023)	14.0 %	1,218,555
38	Libya	0,007,252,573 (2023)	96.6 %	7,005,986
39	Turkmenistan	0,007,057,841 (2022)	93.0 %	6,563,792
40	Kyrgyzstan	0,007,037,590 (2022)	88.0 %	6,193,079
41	Palestine	0,005,613,463 (2024)	97.6 %	5,478,740
42	Lebanon	0,005,331,203 (2023)	61.3 %	3,268,027
43	Mauritania	0,004,244,878 (2023)	99.0 % plus	4,202,429
44	Oman	0,003,833,465 (2023)	85.9 %	3,292,946
45	Kuwait	0,003,103,580 (2023)	74.1 %	2,299,753
46	Qatar	0,002,795,484 (2020)	67.7 %	1,892,543
47	Albania	0,002,793,592 (2022)	56.0 %	1,564,412
48	Gambia	0,002,468,569 (2023)	95.1 %	2,347,609
49	Gabon	0,002,397,368 (2023)	11.2 %	268,505
50	Guinea-Bissau	0,002,078,820 (2023)	45.1 %	937,548
51	Bahrain	0,001,501,635 (2020)	70.3 %	1,055,649
52	Djibouti	0,000,976,143 (2023)	96.9 %	945,883
53	Comoros	0,000,888,378 (2023)	98.3 %	873,276
54	Guyana	0,000,817,607 (2024)	6.4 %	52,327
55	Suriname	0,000,639,759 (2023)	15.2 %	97,243
56	Maldives	0,000,515,132 (2022)	98.4 %	506,890
57	Brunei	0,000,460,345 (2017)	75.1 %	345,719
Total for OIC members		2,010,719,632	80.7 % approx.	1,622,726,299

Notes

1. The membership of Syria in the OIC was suspended in August 2012 during the Syrian civil war.
2. This figure does not include data for Pakistan-administered areas of Kashmir; Azad Kashmir and Gilgit-Baltistan.

References

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3. "Announcement of Results of 7th Population and Housing Census-2023 'The Digital Census'" (PDF). Pakistan Bureau of Statistics (www.pbs.gov.pk). 5 August 2023. Retrieved 15 August 2023.
4. "Nigeria". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 4 March 2023. (Archived 2022 edition.)
5. "Population and Housing Census 2022: Post Enumeration Check (PEC) Adjusted Population" (PDF). Bangladesh Bureau of Statistics. 18 April 2023. Archived (PDF) from the original on 30 May 2023. Retrieved 30 May 2023.
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8. "The Results of Address Based Population Registration System, 2023". www.tuik.gov.tr. Turkish Statistical Institute. 6 February 2024. Retrieved 6 February 2024.
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22. "Niger". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
23. "Syria". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
24. "Burkina Faso". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
25. "Mali". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
26. "Kazakhstan's population hits the mark of 20 mln". inform.kz. 2023-11-16. Retrieved 17 November 2023.
27. "Chad". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
28. "Senegal". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
29. "Benin". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
30. "Guinea". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
31. "Somalia". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 22 June 2023.
32. "National Institute of Statistics - Tunisia". Archived from the original on 28 November 2019. Retrieved 2 March 2020.
33. "Population clock". Jordan Department of Statistics. Archived from the original on 18 August 2019. Retrieved 25 February 2024.
34. "Azerbaijan". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
35. "Agency on Statistics under President of the Republic of Tajikistan". 1 January 2023. Retrieved 2 January 2024.
36. "Statistics by Subject - Population". Federal Competitiveness and Statistics Centre. Retrieved 2 November 2023.
37. "Sierra Leone". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
38. "Togo". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
39. "Libya". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
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43. "Lebanon". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
44. "Mauritania". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
45. "Oman". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
46. "Mauritania". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
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50. "Gabon". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
51. "Guinea-Bissau". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
52. "Bahrain 2020 Census". Information and eGovernment Authority. 28 February 2021. Archived from the original on 2 May 2021. Retrieved 5 April 2021.
53. "Djibouti". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
54. "Comoros". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
55. "Guyana Population (2024) – Worldometer". www.worldometers.info. Retrieved 25 February 2024.
56. "Guinea-Bissau". The World Factbook (2024 ed.). Central Intelligence Agency. Retrieved 25 February 2024.
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• Lists by population
• Organisation of Islamic Cooperation