NATO Countries List – Members of the North Atlantic Treaty Organization
Discover the complete and updated list of NATO member countries as of 2025, their founding details, and more about the North Atlantic Treaty Organization.
NATO Countries List - The North Atlantic Treaty Organization (NATO) was established through the North Atlantic Treaty signed on April 4, 1949. As of 2025, NATO comprises 30 member countries, which includes 27 from Europe, 2 from North America, and 1 from Eurasia. NATO is headquartered in Brussels, Belgium, with the Allied Command Operations headquarters located near Mons, Belgium. Originally, 12 countries signed the NATO treaty in 1949. Article 10 of the North Atlantic Treaty states that membership is open to all European states that contribute to the security of the North Atlantic area. The latest country to join NATO...