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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 | Joined the ASEAN Regional Forum | |
| Head of state | Head of government | |||||||||||
| Brunei | Bandar Seri Begawan | 5,765 | 411,900 | 65 | 29,731 | 0 | Brunei dollar (BND; B$) | Malay | Hassanal Bolkiah | 7 January 1984 | 1994 | |
| Cambodia | Phnom Penh | 181,035 | 15,626,444 | 78 | 78,065 | 0 | Cambodian riel (KHR; ៛) United States dollar (USD; $) | Khmer | Norodom Sihamoni | Hun Manet | 30 April 1999 | |
| Indonesia | Jakarta | 1,904,569 | 255,975,000 | 113 | 3,507,239 | 0 | Indonesian rupiah (IDR; Rp) | Indonesian | Prabowo Subianto | 8 August 1967 | 1994 | |
| Laos | Vientiane | 236,800 | 6,492,400 | 24 | 62,797 | 0 | Lao kip (LAK; ₭) | Lao | Thongloun Sisoulith | Sonexay Siphandone | 23 July 1997 | |
| Malaysia | Kuala Lumpur | 329,847 | 31,427,096 | 72 | 978,781 | 0 | Malaysian ringgit (MYR; RM) | Malay | Ibrahim | Anwar Ibrahim | 8 August 1967 | |
| Myanmar | Naypyidaw | 676,578 | 51,419,420 | 81 | 258,677 | 0 | Burmese kyat (MMK; K) | Burmese | Min Aung Hlaing | 23 July 1997 | 1996 | |
| Philippines | Manila | 343,448 | 103,371,800 | 295 | 1,000,617 | 0 | Philippine peso (PHP; ₱) | Filipino and English | Bongbong Marcos | 8 August 1967 | 1994 | |
| Singapore | Singapore | 707 | 5,535,000 | 6,619 | 952,600 | 0 | Singapore dollar (SGD; S$) | English, Malay, Mandarin, and Tamil | Tharman Shanmugaratnam | Lawrence Wong | 8 August 1967 | |
| Thailand | Bangkok | 513,115 | 65,339,612 | 126 | 1,329,324 | 0 | Thai baht (THB; ฿) | Thai | Vajiralongkorn | Anutin Charnvirakul | 8 August 1967 | |
| Timor-Leste | Dili | 14,874 | 1,231,116 | 76 | 4,928 | 0 | United States dollar (USD; $) Timor-Leste Centavo | Tetum and Portuguese | José Ramos-Horta | Xanana Gusmão | 26 October 2025 | |
| Vietnam | Hanoi | 331,690 | 99,000,000 | 248 | 1,148,054 | 0 | Vietnamese đồng (VND; ₫) | Vietnamese | Tô Lâm | Lê Minh Hưng | 28 July 1995 | |
| ASEAN (total) | Jakarta (headquarters) | 4,479,210 | 673,655,000 | 135 | 5,869 | 0 (UNDP cal.) | — | English (Working language) | Kao Kim Hourn (Secretary-general) | —N/a | —N/a | |
| Country | Capital | Area (km2) | Population | Density (/km2) | GDP per cap. (PPP) | HDI | Currency | Official languages | Leaders | Status | Joined the ASEAN Regional Forum | |
| Head of state | Head of government | |||||||||||
| Papua New Guinea | Port Moresby | 462,840 | 11,781,559 | 25 | 2,560 | 0 | Papua New Guinean kina (PGK; K) | English, Tok Pisin, and Hiri Motu | Charles III | James Marape | Observer | |
| Country | Capital | Area (km2) | Population | Density (/km2) | GDP per cap. (PPP) | HDI | Currency | Official languages | Leaders | Joined the ASEAN Regional Forum | |
| Head of state | Head of government | ||||||||||
| China | Beijing | 9,640,011 | 1,371,790,000 | 139 | 12,880 | 0 | Chinese yuan (CNY; ¥) | Standard Chinese | Xi Jinping | Li Qiang | 1994 |
| Japan | Tokyo | 377,873 | 126,865,000 | 337 | 37,390 | 0 | Japanese yen (JPY; ¥) | Japanese (de facto) | Naruhito | Sanae Takaichi | 1994 |
| South Korea | Seoul | 100,140 | 51,448,183 | 493 | 35,277 | 0 | South Korean won (KRW; ₩) | Korean | Lee Jae-myung | 1994 | |
| Country | Capital | Area (km2) | Population | Density (/km2) | GDP per cap. (PPP) | HDI | Currency | Official languages | Leaders | Joined the ASEAN Regional Forum | |
| Head of state | Head of government | ||||||||||
| Australia | Canberra | 7,686,850 | d 27,536,874 | 3 | 64,547 | 0 | Australian dollar (AUD; A$) | English (de facto) | Charles III | Anthony Albanese | 1994 |
| India | New Delhi | 3,287,240 | a1,366,417,750 | 364 | 5,855 | 0 | Indian rupee (INR; ₹) | Hindi in Devanagari script and English | Droupadi Murmu | Narendra Modi | 1996 |
| New Zealand | Wellington | 268,680 | e4,612,280 | 16 | 35,152 | 0 | 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 | 24,805 | 0 | Russian ruble (RUB; ₽) | Russian | Vladimir Putin | Mikhail Mishustin | 1994 |
| United States | Washington, D . | 9,629,091 | b321,719,000 | 32 | 54,597 | 0 | United States dollar (USD; $) | English (de facto) | Donald Trump | 1994 | |
| Country | Capital | Area (km2) | Population | Density (/km2) | GDP per cap. (PPP) | HDI | Currency | Official languages | Leaders | Joined the ASEAN Regional Forum | |
| Head of state | Head of government | ||||||||||
| Bangladesh | Dhaka | 148,460 | b159,143,012 | 1,099 | 6,636 | 0 | Bangladeshi taka (BDT; ৳) | Bengali | Mohammed Shahabuddin | Tarique Rahman | 2006 |
| Canada | Ottawa | 9,984,670 | c41,651,653 | 4 | 53,558 | 0 | Canadian dollar (CAD; C$) | English and French | Charles III | Mark Carney | 1994 |
| Mongolia | Ulaanbaatar | 1,564,115 | e3,032,606 | 1 | 11,882 | 0 | Mongolian tögrög (MNT; ₮) | Mongolian | Ukhnaagiin Khürelsükh | Nyam-Osoryn Uchral | 1999 |
| North Korea | Pyongyang | 120,540 | d25,155,000 | 198 | 1,8001,800 est. | 0 (2012 UNDP) | North Korean won (KPW; ₩) | Korean | Kim Jong-un | Pak Thae-song | 2000 |
| Pakistan | Islamabad | 796,095 | a191,198,263 | 214 | 4,736 | 0 | 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 | 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 | 0 (UNDP cal.) | Euro (EUR; €) and 7 others | Various | António Costa | Ursula von der Leyen | 1994 |