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As of 2025, the Association of Southeast Asian Nations (ASEAN) has 11 member states and one observer state. ASEAN was founded on 8 August 1967 with five member states: Indonesia, Malaysia, the Philippines, Singapore, and Thailand. It is headquartered in Jakarta, Indonesia.
| Country | Capital | Area(km2) | Population | Density(/km2) | GDP(PPP) | HDI | Currency | Official languages | Leaders | Accession | Joining the ASEAN Regional Forum | |
| Head of state | Head of government | |||||||||||
| Brunei | Bandar Seri Begawan | 5,765 | 411,900 | 65 | 29,731 | 0.838 | Brunei dollar(BND; B$) | Malay | Hassanal Bolkiah | 7 January 1984 | 1994 | |
| Cambodia | Phnom Penh | 181,035 | 15,626,444 | 78 | 78,065 | 0.594 | Cambodian riel(KHR; ៛)United States dollar(USD; $) | Khmer | Norodom Sihamoni | Hun Manet | 30 April 1999 | 1995 |
| Indonesia | Jakarta | 1,904,569 | 255,975,000 | 113 | 3,507,239 | 0.718 | Indonesian rupiah(IDR; Rp) | Indonesian | Prabowo Subianto | 8 August 1967 | 1994 | |
| Laos | Vientiane | 236,800 | 6,492,400 | 24 | 62,797 | 0.613 | Lao kip(LAK; ₭) | Lao | Thongloun Sisoulith | Sonexay Siphandone | 23 July 1997 | 1994 |
| Malaysia | Kuala Lumpur | 329,847 | 31,427,096 | 72 | 978,781 | 0.810 | Malaysian ringgit(MYR; RM) | Malay | Ibrahim | Anwar Ibrahim | 8 August 1967 | 1994 |
| Myanmar | Naypyidaw | 676,578 | 51,419,420 | 81 | 258,677 | 0.583 | Burmese kyat(MMK; K) | Burmese | Min Aung Hlaing (acting) | Nyo Saw | 23 July 1997 | 1996 |
| Philippines | Manila | 343,448 | 103,371,800 | 295 | 1,000,617 | 0.718 | Philippine peso(PHP; ₱) | Filipino and English | Bongbong Marcos | 8 August 1967 | 1994 | |
| Singapore | Singapore | 707.1 | 5,535,000 | 6,619 | 600,063 | 0.938 | Singapore dollar(SGD; S$) | English, Malay, Mandarin, and Tamil | Tharman Shanmugaratnam | Lawrence Wong | 8 August 1967 | 1994 |
| Thailand | Bangkok | 513,115 | 65,339,612 | 126 | 1,329,324 | 0.777 | Thai baht(THB; ฿) | Thai | Vajiralongkorn | Anutin Charnvirakul | 8 August 1967 | 1994 |
| Timor-Leste | Dili | 14,874 | 1,231,116 | 76.2 | 4,928 | 0.620 | United States dollar(USD; $)Timor-Leste Centavo | Tetum and Portuguese | José Ramos-Horta | Xanana Gusmão | 26 October 2025 | 2005 |
| Vietnam | Hanoi | 331,690 | 99,000,000 | 248 | 1,148,054 | 0.704 | Vietnamese đồng(VND; ₫) | Vietnamese | Tô LâmLương Cường | Phạm Minh Chính | 28 July 1995 | 1994 |
| ASEAN (total) | Jakarta (headquarters) | 4,479,210 | 673,655,000 | 135 | 5,869[dubious – discuss] | UNDP cal.) | — | English (Working language) | Kao Kim Hourn (Secretary-general) | — | — | |
| Country | Capital | Area(km2) | Population | Density(/km2) | GDP per cap.(PPP) | HDI | Currency | Official languages | Leaders | Status | Joining the ASEAN Regional Forum | |
| Head of state | Head of government | |||||||||||
| Papua New Guinea | Port Moresby | 462,840 | 11,781,559 | 25.5 | 2,560 | 0.576 | Papua New Guinean kina(PGK; K) | English, Tok Pisin, and Hiri Motu | Charles III | James Marape | Observer | 1994 |
| Country | Capital | Area(km2) | Population | Density(/km2) | GDP per cap.(PPP) | HDI | Currency | Official languages | Leaders | Joining the ASEAN Regional Forum | |
| Head of state | Head of government | ||||||||||
| China | Beijing | 9,640,011 | 1,371,790,000 | 139.6 | 12,880 | 0.719 | Chinese yuan(CNY; ¥) | Standard Chinese | Xi Jinping | Li Qiang | 1994 |
| Japan | Tokyo | 377,873 | 126,865,000 | 337.6 | 37,390 | 0.890 | Japanese yen(JPY; ¥) | Japanese (de facto) | Naruhito | Sanae Takaichi | 1994 |
| South Korea | Seoul | 100,140 | 51,448,183 | 493 | 35,277 | 0.891 | South Korean won(KRW; ₩) | Korean | Lee Jae-myung | 1994 | |
| Country | Capital | Area(km2) | Population | Density(/km2) | GDP per cap.(PPP) | HDI | Currency | Official languages | Leaders | Joining the ASEAN Regional Forum | |
| Head of state | Head of government | ||||||||||
| Australia | Canberra | 7,686,850 | d 27,536,874 | 3.7 | 64,547 | 0.958 | Australian dollar(AUD; A$) | English (de facto) | Charles III | Anthony Albanese | 1994 |
| India | New Delhi | 3,287,240 | a1,366,417,750 | 364.4 | 5,855 | 0.586 | Indian rupee(INR; ₹) | Hindi in Devanagari script and English | Droupadi Murmu | Narendra Modi | 1996 |
| New Zealand | Wellington | 268,680 | e4,612,280 | 16.1 | 35,152 | 0.910 | New Zealand dollar(NZD; NZ$) | English, Māori, and NZ Sign Language | Charles III | Christopher Luxon | 1994 |
| Russia | Moscow | 17,075,400 | c146,567,880 | 8.3 | 24,805 | 0.778 | Russian ruble(RUB; ₽) | Russian | Vladimir Putin | Mikhail Mishustin | 1994 |
| United States | Washington, D.C. | 9,629,091 | b321,719,000 | 32 | 54,597 | 0.914 | United States dollar(USD; $) | English (de facto) | Donald Trump | 1994 | |
| Country | Capital | Area(km2) | Population | Density(/km2) | GDP per cap.(PPP) | HDI | Currency | Official languages | Leaders | Joining the ASEAN Regional Forum | |
| Head of state | Head of government | ||||||||||
| Bangladesh | Dhaka | 148,460 | b159,143,012 | 1,099.3 | 6,636 | 0.632 | Bangladeshi taka(BDT; ৳) | Bengali | Mohammed Shahabuddin | Muhammad Yunus | 2006 |
| Canada | Ottawa | 9,984,670 | c41,651,653 | 4.2 | 53,558 | 0.939 | Canadian dollar(CAD; C$) | English and French | Charles III | Mark Carney | 1994 |
| Mongolia | Ulaanbaatar | 1,564,115 | e3,032,606 | 1.75 | 11,882 | 0.698 | Mongolian tögrög(MNT; ₮) | Mongolian | Ukhnaagiin Khürelsükh | Gombojavyn Zandanshatar | 1999 |
| North Korea | Pyongyang | 120,540 | d25,155,000 | 198.3 | 1,8001,800 est. | UNDP) | North Korean won(KPW; ₩) | Korean | Kim Jong-un | Pak Thae-song | 2000 |
| Pakistan | Islamabad | 796,095 | a191,198,263 | 214.3 | 4,736 | 0.537 | Pakistani rupee(PKR; ₨) | Urdu and English | Asif Ali Zardari | Shehbaz Sharif | 2004 |
| Sri Lanka | Sri Jayawardenepura Kotte (Administrative), Colombo (Commercial) | 65,610 | 20,771,00 | 323 | 10,372 | 0.750 | Sri Lankan rupee(LKR; රු) | Sinhalese and Tamil | Anura Kumara Dissanayake | Harini Amarasuriya | 2007 |
| European Union | Brussels (de facto) | 4,233,262 | 447,706,209 | 106 | 37,607 | UNDP cal.) | Euro (EUR; €) and 7 others | Various | António Costa | Ursula von der Leyen | 1994 |