The following is a list of regional organizations by population.

Flag or Logo	Organization	Founded	Population	% of world	Members	Notes
Error: Template:Country data World population does not exist	World		8,175,894,000	100%	Error: Template:Country data U.S. and World Population Clock does not exist	Population Clock
Error: Template:Country data Asia Cooperation Dialogue does not exist	Asia Cooperation Dialogue	2002	4,752,214,545	58%	Afghanistan  Bahrain  Bangladesh  Bhutan  Brunei  Cambodia  China  India  Indonesia  Iran  Japan  Kazakhstan  South Korea  Kuwait  Kyrgyzstan  Laos  Malaysia  Mongolia  Myanmar  Nepal  Oman  Pakistan  Philippines  Qatar  Russia  Saudi Arabia  Singapore  Sri Lanka  Tajikistan  Thailand  Turkey  United Arab Emirates  Uzbekistan  Vietnam	Membership overlap with ASEAN, SAARC, Commonwealth of Nations, CIS
	Shanghai Cooperation Organisation	2001	3,356,198,195	41%	China  India  Kazakhstan  Kyrgyzstan  Pakistan  Russia  Tajikistan  Uzbekistan	Membership overlap with CIS and Eurasian Economic Community, Asia-Pacific Economic Cooperation, South Asian Association for Regional Cooperation, Commonwealth of Nations
Error: Template:Country data BRICS does not exist	BRICS	2008	3,040,000,000	37%	Brazil  Russia  India  China  South Africa	An association of five major emerging national economies. Membership overlap with Commonwealth of Nations and CIS.
Error: Template:Country data Asia-Pacific Economic Cooperation does not exist	Asia-Pacific Economic Cooperation	1989	2,700,000,000	33%	Australia  Brunei  Canada  Chile  China  Hong Kong  Indonesia  Japan  South Korea  Malaysia  Mexico  New Zealand  Papua New Guinea  Peru  Philippines  Russia  Singapore  Taiwan  Thailand  United States  Vietnam	Membership overlap with Association of Southeast Asian Nations, Commonwealth of Nations, Eurasian Economic Community, North American Free Trade Agreement, NATO, OPEC, Organisation internationale de la Francophonie, Shanghai Cooperation Organisation, Mercosur/Mercosul, Union of South American Nations, African, Caribbean and Pacific Group of States,
	Commonwealth of Nations	1931	2,418,964,000	30%	Antigua and Barbuda  Australia  Bahamas  Bangladesh  Barbados  Belize  Botswana  Brunei  Cameroon  Canada  Cyprus  Dominica  Eswatini  Fiji  Gabon  Gambia  Ghana  Grenada  Guyana  India  Jamaica  Kenya  Kiribati  Lesotho  Malawi  Malaysia  Maldives  Malta  Mauritius  Mozambique  Namibia  Nauru  New Zealand  Nigeria  Pakistan  Papua New Guinea  Rwanda  Saint Kitts and Nevis  Saint Lucia  Saint Vincent and the Grenadines  Samoa  Seychelles  Sierra Leone  Singapore  Solomon Islands  South Africa  Sri Lanka  Tanzania  Togo  Tonga  Trinidad and Tobago  Tuvalu  Uganda  United Kingdom  Vanuatu  Zambia	Membership overlap with European Union, European Economic Area, African, Caribbean and Pacific Group of States, African Union, South Asian Association for Regional Cooperation, Union of South American Nations, Caribbean Community, CARIFORUM, NATO, and Association of Southeast Asian Nations, Asia-Pacific Economic Cooperation, Small Island Developing States, Organisation internationale de la Francophonie
Error: Template:Country data Regional Comprehensive Economic Partnership does not exist	Regional Comprehensive Economic Partnership	2020	2,041,590,650	25%	Australia  Brunei  Cambodia  China  Indonesia  Japan  South Korea  Laos  Malaysia  Myanmar  New Zealand  Philippines  Singapore  Thailand  Vietnam	A Free Trade Agreement (FTA) scheme of the 10 ASEAN Member States and its FTA Partners (Australia, China, Japan, Korea and New Zealand).
	South Asian Association for Regional Cooperation	1985	1,713,870,000	21%	Afghanistan  Bangladesh  Bhutan  India  Maldives  Nepal  Pakistan  Sri Lanka	Membership overlap with Economic Cooperation Organization, Commonwealth of Nations.
	South Atlantic Peace and Cooperation Zone	1986	1,552,860,934	19%	Argentina  Angola  Benin  Brazil  Cape Verde  Cameroon  Congo  DR Congo  Equatorial Guinea  Gabon  Gambia  Ghana  Guinea  Guinea-Bissau  Ivory Coast  Liberia  Namibia  Nigeria  São Tomé and Príncipe  Senegal  Sierra Leone  South Africa  Togo  Uruguay	Membership overlap with Commonwealth of Nations, Organisation internationale de la Francophonie
	Organization for Security and Co-operation in Europe	1975	1,276,751,497	16%	Albania  Andorra  Armenia  Austria  Azerbaijan  Belarus  Belgium  Bosnia and Herzegovina  Bulgaria  Canada  Croatia  Cyprus  Czech Republic  Denmark  Estonia  Finland  France  Georgia  Germany  Greece  Hungary  Iceland  Ireland  Italy  Kazakhstan  Kyrgyzstan  Latvia  Liechtenstein  Lithuania  Luxembourg  Malta  Moldova  Monaco  Mongolia  Montenegro  Netherlands  North Macedonia  Norway  Poland  Portugal  Romania  Russia  San Marino  Serbia  Slovakia  Slovenia  Spain  Sweden  Switzerland  Tajikistan  Turkey  Turkmenistan  Ukraine  United Kingdom  United States  Uzbekistan  Vatican City	Membership overlap with EU, NATO, Commonwealth of Nations, Organisation Internationale de la Francophonie
	African Union	2002	1,275,920,972	16%	Algeria  Angola  Benin  Botswana  Burkina Faso  Burundi  Cape Verde  Cameroon  Central African Republic  Chad  Comoros  DR Congo  Djibouti  Egypt  Equatorial Guinea  Eritrea  Eswatini  Ethiopia  Gabon  Gambia  Ghana  Guinea  Guinea-Bissau  Ivory Coast  Kenya  Lesotho  Liberia  Libya  Madagascar  Malawi  Mali  Mauritania  Mauritius  Morocco  Mozambique  Namibia  Niger  Nigeria  Congo  Rwanda  Sahrawi Arab Democratic Republic  São Tomé and Príncipe  Senegal  Seychelles  Sierra Leone  Somalia  South Africa  South Sudan  Sudan  Tanzania  Togo  Tunisia  Uganda  Zambia  Zimbabwe	Membership overlap with Commonwealth of Nations, Organisation internationale de la Francophonie
	Organisation internationale de la Francophonie	1970	1,000,000,000	12%	Albania  Andorra  Armenia  Belgium ( French Community of Belgium)  Benin  Bulgaria  Burkina Faso  Burundi  Cambodia  Cameroon  Canada ( New Brunswick) ( Quebec)  Cape Verde  Central African Republic  Chad  Comoros  Congo  DR Congo  Djibouti  Dominica  Equatorial Guinea  Egypt  France  Gabon  Greece  Guinea  Guinea-Bissau  Haiti  Ivory Coast  Laos  Lebanon  Luxembourg  Madagascar  Mali  Mauritania  Mauritius  Moldova  Monaco  Morocco  North Macedonia  Niger  Romania  Rwanda  Saint Lucia  São Tomé and Príncipe  Senegal  Seychelles   Switzerland  Togo  Tunisia  Vanuatu  Vietnam	Membership overlap with North Atlantic Treaty Organization, European Economic Area, North American Free Trade Agreement, Arab League, Association of Caribbean States, Caribbean Community, Commonwealth of Nations
	Organization of American States	1948	980,457,921	12%	Antigua and Barbuda  Argentina  Bahamas  Barbados  Belize  Bolivia  Brazil  Canada  Chile  Colombia  Costa Rica  Dominica  Dominican Republic  Ecuador  El Salvador  Grenada  Guatemala  Guyana  Haiti  Honduras  Jamaica  Mexico  Nicaragua  Panama  Paraguay  Peru  Saint Kitts and Nevis  Saint Lucia  Saint Vincent and the Grenadines  Suriname  Trinidad and Tobago  United States  Uruguay  Venezuela	Membership overlap with NATO, North American Free Trade Agreement, Mercosur/Mercosul, Asia-Pacific Economic Cooperation, Union of South American States, CAFTA-DR, Community of Latin American and Caribbean States, RIO Group, Caribbean Community, Association of Caribbean States, Commonwealth of Nations, Organisation internationale de la Francophonie
	North Atlantic Treaty Organization	1949	880,978,798	11%	Albania  Belgium  Bulgaria  Canada  Croatia  Czech Republic  Denmark  Estonia  Finland  France  Germany  Greece  Hungary  Iceland  Italy  Latvia  Lithuania  Luxembourg  Montenegro  Netherlands  North Macedonia  Norway  Poland  Portugal  Romania  Slovakia  Slovenia  Spain  Sweden  Turkey  United Kingdom  United States	Membership overlap with Commonwealth of Nations, European Union, Organisation internationale de la Francophonie, Asia-Pacific Economic Cooperation, North American Free Trade Agreement, Organization of American States)
	Council of Europe	1949	820,000,000	10%	Albania  Andorra  Armenia  Austria  Azerbaijan  Belgium  Bosnia and Herzegovina  Bulgaria  Croatia  Cyprus  Czech Republic  Denmark  Estonia  Finland  France  Georgia  Germany  Greece  Hungary  Iceland  Ireland  Italy  Latvia  Liechtenstein  Lithuania  Luxembourg  Malta  Moldova  Monaco  Montenegro  Netherlands  North Macedonia  Norway  Poland  Portugal  Romania  San Marino  Serbia  Slovakia  Slovenia  Spain  Sweden  Switzerland  Turkey  Ukraine  United Kingdom	Membership overlap with Commonwealth of Nations, Organisation internationale de la Francophonie
Error: Template:Country data Inter-American Treaty of Reciprocal Assistance does not exist	Inter-American Treaty of Reciprocal Assistance	1948	754,901,942	9.2%	Argentina  Bahamas  Brazil  Chile  Colombia  Costa Rica  Dominican Republic  El Salvador  Guatemala  Haiti  Honduras  Panama  Paraguay  Peru  Trinidad and Tobago  United States  Venezuela	Membership overlap with Organization of American States, Commonwealth of Nations, Organisation internationale de la Francophonie
	Community of Latin American and Caribbean States	2010	652,012,001	8.0%	Antigua and Barbuda  Argentina  Bahamas  Barbados  Belize  Bolivia  Chile  Colombia  Costa Rica  Cuba  Dominica  Dominican Republic  Ecuador  El Salvador  Grenada  Guatemala  Guyana  Haiti  Honduras  Jamaica  Mexico  Nicaragua  Panama  Paraguay  Peru  Saint Kitts and Nevis  Saint Lucia  Saint Vincent and the Grenadines  Suriname  Trinidad and Tobago  Uruguay  Venezuela	Membership overlap with Organization of American States, Commonwealth of Nations, Organisation internationale de la Francophonie
	Association of Southeast Asian Nations	1967	647,016,000	7.9%	Brunei  Cambodia  Indonesia  Laos  Malaysia  Myanmar  Philippines  Singapore  Thailand  Vietnam	Membership overlap with Asia-Pacific Economic Cooperation, African, Caribbean and Pacific Group of States, Small Islands Developing States, Commonwealth of Nations, Organisation internationale de la Francophonie
	Latin American Integration Association	1980	515,722,726	6.3%	Argentina  Bolivia  Brazil  Chile  Colombia  Cuba  Ecuador  Mexico  Paraguay  Panama  Peru  Uruguay  Venezuela	Membership overlap with Organization of American States
Error: Template:Country data European Economic Area does not exist	European Economic Area	1994	515,000,000	6.3%	Austria  Belgium  Bulgaria  Croatia  Cyprus  Czech Republic  Denmark  European Union  Estonia  Finland  France  Germany  Greece  Hungary  Iceland  Ireland  Italy  Latvia  Liechtenstein  Lithuania  Luxembourg  Malta  Netherlands  Norway  Poland  Portugal  Romania  Slovakia  Slovenia  Spain  Sweden  Switzerland	Membership overlap with European Union, European Free Trade Association, Commonwealth of Nations, Organisation internationale de la Francophonie
	United States–Mexico–Canada Agreement	1994	490,000,000	6.0%	Canada  Mexico  United States	Membership overlap with Commonwealth of Nations, NATO, Organisation internationale de la Francophonie, Asia-Pacific Economic Cooperation, CAFTA-DR, Organization of American States
Error: Template:Country data Economic Cooperation Organization does not exist	Economic Cooperation Organization	1985	488,405,949	6.0%	Afghanistan  Azerbaijan  Iran  Kazakhstan  Kyrgyzstan  Pakistan  Tajikistan  Turkey  Turkmenistan  Uzbekistan	Membership overlap with South Asian Association for Regional Cooperation, Commonwealth of Nations
	European Union	1957	447,700,000	5.5%	Austria  Belgium  Bulgaria  Croatia  Cyprus  Czech Republic  Denmark  Estonia  Finland  France  Germany  Greece  Hungary  Ireland  Italy  Latvia  Lithuania  Luxembourg  Malta  Netherlands  Poland  Portugal  Romania  Slovakia  Slovenia  Spain  Sweden	Membership overlap with NATO, Commonwealth of Nations, European Economic Area, Organisation internationale de la Francophonie[1][2]
	Arab League	1945	423,000,000	5.2%	Algeria  Bahrain  Comoros  Djibouti  Egypt  Iraq  Jordan  Kuwait  Lebanon  Libya  Mauritania  Morocco  Oman  Palestine  Qatar  Saudi Arabia  Somalia  Sudan  Syria  Tunisia  United Arab Emirates  Yemen	Membership overlap with African Union, Organisation internationale de la Francophonie
Error: Template:Country data Forum for the Progress and Development of South America does not exist	Forum for the Progress and Development of South America	2019	392,513,571	4.8%	Argentina  Brazil  Chile  Colombia  Ecuador  Guyana  Paraguay  Peru	Membership overlap with Commonwealth of Nations
	OPEC	1960	369,814,472	4.5%	Algeria  Angola  Congo  Equatorial Guinea  Gabon  Iran  Iraq  Kuwait  Libya  Nigeria  Saudi Arabia  United Arab Emirates  Venezuela	Membership overlap with Shanghai Cooperation Organisation, South Asian Association for Regional Cooperation, Organization of American States, African Union, Economic Cooperation Organization, Union of South American Nations, Arab League, Mercosur or Mercosul, Commonwealth of Nations, Organisation internationale de la Francophonie
Error: Template:Country data Organization of the Black Sea Economic Cooperation does not exist	Organization of the Black Sea Economic Cooperation	1992	330,000,000	4.0%	Albania  Armenia  Azerbaijan  Bulgaria  Georgia  Greece  Moldova  Romania  Russia  Serbia  Turkey  Ukraine	Membership overlap with CIS, Organisation internationale de la Francophonie
Error: Template:Country data Council of the Baltic Sea States does not exist	Council of the Baltic Sea States	1992	300,744,708	3.7%	Denmark  Estonia  Finland  Germany  Iceland  Latvia  Lithuania  Norway  Poland  Russia  Sweden	Membership overlap with EU, CIS, Nordic Council, OBSEC.
	Commonwealth of Independent States	1991	277,983,490	3.4%	Azerbaijan  Belarus  Kazakhstan  Kyrgyzstan  Armenia  Moldova  Russia  Tajikistan  Uzbekistan	Membership overlap with Asia-Pacific Economic Cooperation
	Mercosur/Mercosul	1991	265,212,435	3.2%	Argentina  Brazil  Paraguay  Uruguay	Membership overlap with Union of South American Nations, Asia-Pacific Economic Cooperation, Unions of South American Nations, Latin Union, Community of Latin American and Caribbean States, RIO Group, Organization of American States
	Association of Caribbean States	1994	237,000,000	2.9%	Antigua and Barbuda  Bahamas  Barbados  Belize  Colombia  Costa Rica  Cuba  Dominica  Dominican Republic  El Salvador  Grenada  Guatemala  Guyana  Haiti  Honduras  Jamaica  Mexico  Nicaragua  Panama  Saint Kitts and Nevis  Saint Lucia  Saint Vincent and the Grenadines  Suriname  Trinidad and Tobago  Venezuela	An economic zone of Central American plus Caribbean states along with northern South America. Membership overlap with Latin Union, Commonwealth of Nations, Organisation internationale de la Francophonie, Community of Latin American and Caribbean States, Union of South American Nations, Caribbean Community, CARIFORUM, RIO Group, CAFTA-DR, Organization of American States
	Pacific Alliance	2012	218,536,683	2.7%	Chile  Colombia  Mexico  Peru	Membership overlap with Organization of American States
	Collective Security Treaty Organisation	1994	210,000,000	2.6%	Armenia  Belarus  Kazakhstan  Kyrgyzstan  Russia  Tajikistan	Membership overlap with Commonwealth of Independent States, Shanghai Cooperation Organisation, Asia-Pacific Economic Cooperation
	Eurasian Economic Union	2001	205,693,649	2.5%	Armenia  Belarus  Kazakhstan  Kyrgyzstan  Russia	Membership overlap with Commonwealth of Independent States and Shanghai Cooperation Organisation, Asia-Pacific Economic Cooperation
	Organization of Turkic States	2009	151,041,079	1.8%	Azerbaijan  Kazakhstan  Kyrgyzstan  Turkey  Uzbekistan	Membership overlap with Economic Cooperation Organization
Error: Template:Country data South-East European Cooperation Process does not exist	South-East European Cooperation Process	1996	150,492,458	1.8%	Albania  Bosnia and Herzegovina  Bulgaria  Croatia  Greece  Kosovo  Moldova  Montenegro  North Macedonia  Romania  Serbia  Slovenia  Turkey	Membership overlap with EU, Council of Europe and Organisation internationale de la Francophonie.
Error: Template:Country data British-Irish Council does not exist	British-Irish Council	1999	73,072,783	0.89%	Guernsey  Ireland  Isle of Man  Jersey  United Kingdom	Membership overlap with EU and Commonwealth of Nations. The devolved institutions of Northern Ireland, Scotland and Wales are represented separately.
	Visegrád Group	1991	65,347,507	0.80%	Czech Republic  Hungary  Poland  Slovakia	Membership overlap with EU
	GUAM Organization for Democracy and Economic Development	1999	62,140,327	0.76%	Azerbaijan  Georgia  Moldova  Ukraine [4]	Membership overlap with EU
	Central American Integration System	1993	51,152,936	0.63%	Belize  Costa Rica  Dominican Republic  El Salvador  Guatemala  Honduras  Nicaragua  Panama	An economic and political organization of eight Central American states Membership overlap with Latin Union, Community of Latin American and Caribbean States, Union of South American Nations, Association of Caribbean States, RIO Group, CAFTA-DR, Organization of American States, Commonwealth of Nations
	Union of South American Nations	2005	49,002,000	0.60%	Bolivia  Guyana  Suriname  Uruguay  Venezuela	Membership overlap with Mercosur/Mercosul, Asia-Pacific Economic Cooperation, Latin Union, Community of Latin American and Caribbean States, RIO Group, Association of Caribbean States, Commonwealth of Nations
	Pacific Islands Forum	1971	40,054,000	0.49%	Australia  Cook Islands  Fiji  French Polynesia  Kiribati  Marshall Islands  Micronesia  Nauru  New Caledonia  New Zealand  Niue  Palau  Papua New Guinea  Samoa  Solomon Islands  Tonga  Tuvalu  Vanuatu	Membership overlaps with APEC, Commonwealth of Nations
	Benelux	1948	29,300,000	0.36%	Belgium  Luxembourg  Netherlands	Membership overlap with EU, Organisation internationale de la Francophonie
	Nordic Council	1953	25,880,000	0.32%	Denmark  Finland  Iceland  Norway  Sweden	Membership overlap with EU
	Central European Free Trade Agreement	1992	21,907,354	0.27%	Albania  Bosnia and Herzegovina  Kosovo (through UNMIK)  Moldova  Montenegro  North Macedonia  Serbia	Membership overlap with Organisation internationale de la Francophonie
	Caribbean Community	1973	18,095,201	0.22%	Antigua and Barbuda  Bahamas  Barbados  Belize  Dominica  Grenada  Guyana  Haiti  Jamaica  Montserrat  Saint Kitts and Nevis  Saint Lucia  Saint Vincent and the Grenadines  Suriname  Trinidad and Tobago	An economic organization made up of fifteen full members, (fourteen independent countries + one British overseas territory.) Membership overlap with Commonwealth of Nations, Organisation internationale de la Francophonie, Small Islands Developing States, CARIFORUM, Community of Latin American and Caribbean States, Union of South American Nations, Association of Caribbean States, Organization of Eastern Caribbean States, RIO Group, Central American Integration System, Organization of American States
	European Free Trade Association	1960	14,050,000	0.17%	Iceland  Liechtenstein  Norway  Switzerland	Membership overlap with EEA, Organisation internationale de la Francophonie.
	Organisation of Eastern Caribbean States	1981	608,961	0.0074%	Antigua and Barbuda  Dominica  Grenada  Montserrat  Saint Kitts and Nevis  Saint Lucia  Saint Vincent and the Grenadines	Membership overlap with CARICOM, Commonwealth of Nations and Organisation internationale de la Francophonie.

• United Nations Analytical Report for the 2004 revision of World Population Prospects – includes details of methodology and sources used for the population estimates above.
• Population clocks & projected growth charts for all countries
• Population clock