OPEC Countries
| Country | Region | Membership years[2][3] | Population (2018 est.)[139][140] | Area (km2)[141] | Oil production (bbl/day, 2016)[A][136] | Proven reserves (bbl, 2016)[A][142] |
|---|---|---|---|---|---|---|
 Algeria | North Africa | 1969– | 42,228,408 | 2,381,740 | 1,348,361 | 12,200,000,000 |
 Angola | Southern Africa | 2007– | 30,809,787 | 1,246,700 | 1,769,615 | 8,423,000,000 |
 Equatorial Guinea | Central Africa | 2017– | 1,308,975 | 28,050 | … | … |
 Gabon | Central Africa | 1975–1995, 2016– | 2,119,275 | 267,667 | 210,820 | 2,000,000,000 |
 Iran | Middle East | 1960[B]– | 81,800,188 | 1,648,000 | 3,990,956 | 157,530,000,000 |
 Iraq | Middle East | 1960[B]– | 38,433,600 | 437,072 | 4,451,516 | 143,069,000,000 |
 Kuwait | Middle East | 1960[B]– | 4,137,312 | 17,820 | 2,923,825 | 101,500,000,000 |
 Libya | North Africa | 1962– | 6,678,559 | 1,759,540 | 384,686 | 48,363,000,000 |
 Nigeria | West Africa | 1971– | 195,874,685 | 923,768 | 1,999,885 | 37,070,000,000 |
 Republic of the Congo | Central Africa | 2018[143]– | 5,125,821 | 342,000 | 260,000 | 1,600,000,000 |
 Saudi Arabia | Middle East | 1960[B]– | 33,702,756 | 2,149,690 | 10,460,710 | 266,578,000,000 |
 United Arab Emirates | Middle East | 1967[C]– | 9,630,959 | 83,600 | 3,106,077 | 97,800,000,000 |
 Venezuela | South America | 1960[B]– | 28,887,118 | 912,050 | 2,276,967 | 299,953,000,000 |
| OPEC total | 483,630,000 | 12,492,695 | 35,481,740 | 1,210,703,000,000 | ||
| World total | 7,915,699,000 | 510,072,000 | 80,622,287[144] | 1,650,585,000,000 | ||
| OPEC percent | 6.3% | 2.4% | 44% | 73% |