Date of accession
1949
1952
1955
1982
1990
Membership
being discussed
1999
2004
2009
2017
2020
Finland
Not on the map
Sweden
Russia
US
Canada
Estonia
Latvia
Lithuania
Czech
Rep
Poland
Ukraine
Hungary
Slovakia
Romania
Slovenia
Bulgaria
Croatia
Montenegro
North Macedonia
Albania
Date of
accession
1949
1952
1955
1982
1990
1999
2004
2009
2017
2020
Membership being discussed
Not on the map
US
Canada
Iceland
Finland
Norway
Russia
Sweden
Estonia
Latvia
UK
Denmark
Lithuania
Germany
Poland
Netherlands,
Belgium, Lux
Ukraine
Czech Rep
Slovakia
Slovenia
Hungary
France
Romania
Croatia
Bulgaria
Portugal
Spain
Turkey
Italy
Greece
Albania
North Macedonia
Montenegro