List Of NATO Countries With Details (2025 Updated)

Last Updated: 9 September 2025

Before we get into the List of NATO Counties, let’s have a quick intro about NATO and how it works.

North Atlantic Treaty Organization in short NATO is an international alliance that consists of 32 member states from Europe and North America. 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 shall be considered an attack against all members, and other members shall assist the attacked member, with armed forces if necessary.

Facts About NATO

---

• Out of the 32 member countries, 30 are in Europe and two are in North America.

• Between 1994 and 1997, broader forums for regional cooperation between NATO and its neighbors were set up, including the Partnership for Peace, the Mediterranean Dialogue initiative, and the Euro-Atlantic Partnership Council.

• All members have militaries, except for Iceland, which does not have a typical army but a coast guard and a small unit of civilian specialists 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 states. Three more members joined between 1952 and 1955, and a fourth new member joined in 1982.

• After the end of the Cold War, NATO added 16 more members from 1999 to 2024.

• Finland joined in 2023 and Sweden joined in 2024.

• No country that has joined NATO has ever opted to leave it since its founding, although France withdrew from NATO unified command between 1966 and 2009.

• Since the accession of Sweden on 7 March 2024, the North Atlantic Treaty Organization covers a total area of 27,580,492 km² 

List Of NATO Countries

---

No.	Flag	Country	Capital	Accession	Area (km2)
1		Albania	Tirana	01 Apr 2009	28,748
2		Belgium	Brussels	24 Aug 1949	30,528
3		Bulgaria	Sofia	29 Mar 2004	1,10,879
4		Canada	Ottawa	24 Aug 1949	9,984,670
5		Croatia	Zagreb	1 Apr 2009	56,594
6		Czech Republic	Prague	12 Mar 1999	78,867
7		Denmark	Copenhagen	24 Aug 1949	2,210,573
8		Estonia	Tallinn	29 Mar 2004	45,228
9		Finland	Helsinki	4 Apr 2023	3,38,455
10		France	Paris	24 Aug 1949	6,43,427
11		Germany	Berlin	8 May 1955	3,57,022
12		Greece	Athens	18 Feb 1952	1,31,957
13		Hungary	Budapest	12 Mar 1999	93,028
14		Iceland	Reykjavík	24 Aug 1949	1,03,000
15		Italy	Rome	24 Aug 1949	3,01,340
16		Latvia	Riga	29 Mar 2004	64,589
17		Lithuania	Vilnius	29 Mar 2004	65,300
18		Luxembourg	Luxembourg	24 Aug 1949	2,586
19		Montenegro	Podgorica	5 Jun 2017	13,812
20		Netherlands	Amsterdam	24 Aug 1949	41,543
21		North Macedonia	Skopje	27 Mar 2020	25,713
22		Norway	Oslo	24 Aug 1949	3,85,207
23		Poland	Warsaw	12 Mar 1999	3,12,685
24		Portugal	Lisbon	24 Aug 1949	92,090
25		Romania	Bucharest	29 Mar 2004	2,38,391
26		Slovakia	Bratislava	29 Mar 2004	49,035
27		Slovenia	Ljubljana	29 Mar 2004	20,273
28		Spain	Madrid	30 May 1982	5,05,370
29		Sweden	Stockholm	07 Mar 2024	4,50,295
30		Turkey	Ankara	18 Feb 1952	7,83,562
31		United Kingdom	London	24 Aug 1949	2,43,610
32		United States	Washington, D.C.	24 Aug 1949	9,833,520

Founding And Changes In Membership

---

• Eighteen countries have joined NATO since its founding in 1949 by 12 countries (Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom, and the United States). No countries have left.

• The largest membership increase occurred in 2004 when 7 countries joined.

• Twentieth Century additions included Greece and Turkey in 1952, West Germany in 1955, and Spain in 1982. Three former Warsaw Pact countries, Hungary, the Czech Republic, and Poland joined in 1999 (invited 1997). The 1990 reunification of Germany brought in the territory of the former country of East Germany.

• Twenty-first Century additions began in May 2000 when 10 countries of the Baltics and Eastern Europe formed the Vilnius group to cooperate and lobby for NATO membership.

• Seven within the Vilnius group (Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia, Slovenia) joined in 2004.

• The remaining three joined subsequently, Albania and Croatia in 2009 and North Macedonia in 2020. Montenegro joined in 2017.

Military Personnel Of NATO Countries

---

The following list is constructed from The Military Balance, published annually by the International Institute for Strategic Studies

No.	Flag	Country	Active Military	Reserve Military	Para Military	Total Military
1		Albania	5,350	2,100	2,150	9,600
2		Belgium	23,500	5,900	0	29,400
3		Bulgaria	36,950	3,000	0	39,950
4		Canada	62,300	29,100	5,800	97,200
5		Croatia	16,800	21,000	3,000	40,800
6		Czech Republic	26,600	4,200	0	30,800
7		Denmark	13,100	44,200	0	57,300
8		Estonia	7,100	20,000	21,200	48,300
9		Finland	23,850	2,33,000	2,900	2,59,750
10		France	2,02,200	38,500	95,100	3,35,800
11		Germany	1,79,850	34,100	0	2,13,950
12		Greece	1,32,000	2,89,000	7,400	4,28,400
13		Hungary	32,150	20,000	0	52,150
14		Iceland	0	0	250	250
15		Italy	1,61,850	14,500	1,78,600	3,54,950
16		Latvia	6,600	16,000	0	22,600
17		Lithuania	16,100	12,950	18,400	47,450
18		Luxembourg	900	0	600	1,500
19		Montenegro	2,710	2,800	4,100	9,610
20		Netherlands	33,650	6,350	6,500	46,500
21		North Macedonia	8,000	4,850	7,600	20,450
22		Norway	25,400	40,000	0	65,400
23		Poland	1,64,100	37,500	14,300	2,15,900
24		Portugal	21,500	23,500	22,600	67,600
25		Romania	69,900	55,000	57,000	1,81,900
26		Slovakia	12,800	0	0	12,800
27		Slovenia	6,200	950	0	7,150
28		Spain	1,22,200	13,800	80,500	2,16,500
29		Sweden	14,850	21,500	0	36,350
30		Turkey	3,55,200	3,78,700	1,60,800	8,94,700
31		United Kingdom	1,41,100	70,450	0	2,11,550
32		United States	1,315,600	7,97,200	0	21, 12,800
		NATO	32,40,410	22,33,850	6,88,800	6,163,060

Read More

• List Of US Senators State Wise (2025 Updated)
• List Of International Organizations & Top Institutions Headquarters
• Top 150 Automobile Companies & Their Country Of Origin (2025)
• List Of All Social Networking Sites And Their Founders 2025
• Presidents Of The United States Of America 2025 In Chronological Order