Member states of ASEAN

██ ASEAN full member states
██ ASEAN observer state
██ ASEAN Plus Three
███ East Asia Summit
█████ ASEAN Regional Forum

As of 2026, 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.

Lists

A list of member states is provided below. The members of ASEAN Plus Three and the East Asia Summit are also listed. Both forums are ASEAN-led and meetings are held following the ASEAN Summit.

Also listed are participants of the ASEAN Regional Forum (ARF), an organisation throughout the Asia–Pacific region whose objectives are to foster dialogue and consultation, and promote confidence-building and preventive diplomacy in the region.

The ASEAN is an organisation on the Southeast Asian region that aims to accelerate economic growth, social progress, and cultural development among its members and to promote regional peace.

ASEAN member states

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	0.837	Brunei dollar (BND; B$)	Malay	Hassanal Bolkiah		7 January 1984	1994
Cambodia	Phnom Penh	181,035	15,626,444	78	78,065	0.606	Cambodian riel (KHR; ៛) United States dollar (USD; $)	Khmer	Norodom Sihamoni	Hun Manet	30 April 1999	1995
Indonesia	Jakarta	1,904,569	255,975,000	113	3,507,239	0.728	Indonesian rupiah (IDR; Rp)	Indonesian	Prabowo Subianto		8 August 1967	1994
Laos	Vientiane	236,800	6,492,400	24	62,797	0.617	Lao kip (LAK; ₭)	Lao	Thongloun Sisoulith	Sonexay Siphandone	23 July 1997	1994
Malaysia	Kuala Lumpur	329,847	31,427,096	72	978,781	0.819	Malaysian ringgit (MYR; RM)	Malay	Ibrahim	Anwar Ibrahim	8 August 1967	1994
Myanmar	Naypyidaw	676,578	51,419,420	81	258,677	0.609	Burmese kyat (MMK; K)	Burmese	Min Aung Hlaing		23 July 1997	1996
Philippines	Manila	343,448	103,371,800	295	1,000,617	0.720	Philippine peso (PHP; ₱)	Filipino and English	Bongbong Marcos		8 August 1967	1994
Singapore	Singapore	707.1	5,535,000	6,619	952,600	0.946	Singapore dollar (SGD; S$)	English, Malay, Mandarin, and Tamil	Tharman Shanmugaratnam	Lawrence Wong	8 August 1967	1994
Thailand	Bangkok	513,115	65,339,612	126	1,329,324	0.798	Thai baht (THB; ฿)	Thai	Vajiralongkorn	Anutin Charnvirakul	8 August 1967	1994
Timor-Leste	Dili	14,874	1,231,116	76.2	4,928	0.634	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	0.766	Vietnamese đồng (VND; ₫)	Vietnamese	Tô Lâm	Lê Minh Hưng	28 July 1995	1994
ASEAN (total)	Jakarta (headquarters)	4,479,210	673,655,000	135	5,869	0.729 (UNDP cal.)	—	English (Working language)	Kao Kim Hourn (Secretary-general)		—N/a	—N/a

Non-member states

ASEAN observer states

See also: Enlargement of ASEAN

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	25.5	2,560	0.576	Papua New Guinean kina (PGK; K)	English, Tok Pisin, and Hiri Motu	Charles III	James Marape	Observer	1994

ASEAN Plus Three Nation States

Main article: ASEAN Free Trade Area § ASEAN Plus Three

The present members of ASEAN together with:

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	139.6	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