Member states of NATO

Current NATO members highlighted in blue

Timeline of countries becoming NATO members. Dark blue marks countries that were already NATO members at the given time. Light blue marks new members.

The NATO (North Atlantic Treaty Organization) is an international alliance that consists of 28 member states from North America and Europe. It was established at the signing of the North Atlantic Treaty on 4 April 1949. Article Five of the treaty states that if an armed attack occurs against one of the member states, it should be considered an attack against all members, and other members shall assist the attacked member, with armed forces if necessary.

Of the 28 member countries, two are located in North America (Canada and the United States) and 25 are European countries while Turkey is in Eurasia. All members have militias, although Iceland does not have a typical army (it does, however, have a military coast guard and a small unit of soldiers for NATO operations). Three of NATO's members are nuclear weapons states: France, the United Kingdom, and the United States. NATO has 12 original founding member nation states and through April 2009 it has added 16 more member nations.

Member states by date of accession

See also: Enlargement of NATO

Date	Country	Enlargement	Notes
4 April 1949	Belgium	Founders
	Canada
	Denmark		Denmark's NATO membership does include the Faroe Islands and Greenland.
	France		France withdrew from the integrated military command in 1966 to pursue an independent defense system but returned to full participation on April 3, 2009.
	Iceland		Iceland, the sole member that does not have its own standing army, joined on the condition that it would not be expected to establish one. However, its strategic geographic position in the Atlantic made it an invaluable member. It has a Coast Guard and has recently contributed a voluntary peacekeeping force, trained in Norway for NATO.
	Italy
	Luxembourg
	Netherlands
	Norway
	Portugal
	United Kingdom
	United States
18 February 1952	Greece	First	Greece withdrew its forces from NATO’s military command structure from 1974 to 1980 as a result of Greco-Turkish tensions following the 1974 Turkish invasion of Cyprus.
	Turkey
9 May 1955	Germany	Second	Joined as West Germany; Saarland reunited with it in 1957 and the territories of Berlin and the former German Democratic Republic reunited with it on 3 October 1990. The GDR (East Germany) was a member of the rival Warsaw Pact 1956–1990.
30 May 1982	Spain	Third
12 March 1999	Czech Republic	Fourth	Member of the rival Warsaw Pact 1955–1991 as part of Czechoslovakia.
	Hungary		Member of the rival Warsaw Pact 1955–1991.
	Poland		Member of the rival Warsaw Pact 1955–1991.
29 March 2004	Bulgaria	Fifth	Member of the rival Warsaw Pact 1955–1991.
	Estonia		Member of the rival Warsaw Pact 1955–1991 as part of the Soviet Union.
	Latvia		Member of the rival Warsaw Pact 1955–1991 as part of the Soviet Union.
	Lithuania		Member of the rival Warsaw Pact 1955–1991 as part of the Soviet Union.
	Romania		Member of the rival Warsaw Pact 1955–1991.
	Slovakia		Member of the rival Warsaw Pact 1955–1991 as part of Czechoslovakia.
	Slovenia		Previously part of Yugoslavia 1945–1991 (Non-aligned)
1 April 2009	Albania	Sixth	Member of the rival Warsaw Pact 1955–1968.
	Croatia		Previously part of Yugoslavia 1945–1991 (Non-aligned)

Table

Country	Population (2011)	GDP (nominal) (2010, US$ millions)	Military expenditures (2011, US$ millions)	Military expenditures (2011, % of GDP)	Defence expenditures, (2011, per capita)	Deployable military (2011, thousands)
Albania	2,834,667	13,292	197	1.5	51	10
Belgium	10,827,519	465,676	5,541	1.1	404	32
Bulgaria	7,351,234	44,843	758	1.55	64	29
Canada	34,447,000	1,574,051	23,685	1.4	492	60
Croatia	4,425,747	59,917	970	1.5	161	16
Czech Republic	10,515,818	192,152	2,448	1.1	162	23
Denmark	5,560,628	310,760	4,518	1.4	636	18
Estonia	1,340,122	19,220	389	1.7	195	6
France	65,821,885	2,582,527	53,444	1.9	666	227
Germany	81,802,000	3,315,643	48,140	1.4	500	205
Greece	11,306,183	305,415	6,425	2.1	427	124
Hungary	10,014,324	128,960	1,378	1.0	111	29
Iceland	318,452	12,767	12	0.09	37	0a
Italy	60,605,053	2,055,114	30,228	1.4	351	352
Latvia	2,229,500	23,385	289	1.0	76	5
Lithuania	3,249,400	35,734	351	0.8	75	9
Luxembourg	502,100	52,433	279	0.5	402	0.9
Netherlands	16,667,700	783,293	11,339	1.3	553	48
Norway	4,937,900	483,650	7,232	1.5	1036	21
Poland	38,092,000	468,539	8,908	1.7	181	100
Portugal	10,636,888	229,336	3,611	1.5	274	39
Romania	21,466,174	161,629	2,380	1.3	67	66
Slovakia	5,435,273	86,262	1,065	1.1	126	16
Slovenia	2,046,510	46,442	665	1.3	255	7
Spain	46,148,605	1,409,946	13,984	0.9	241	127
Turkey	73,722,988	741,853	14,479	1.9	149	495
United Kingdom	62,008,048	2,247,455	63,567	2.6	994	192
United States	311,328,000	14,657,800	731,879	4.8	2,060	1,427
NATO	906,002,051	32,223,344	1,038,145	3.0	987	3,515
From "Data Relating to NATO Defence", estimates for 2011 a Iceland has no armed forces.