Datasets:
| | State | Membership | Parliament | Membership status | Represented since | Members | | |
| | Denmark | Full | The Folketing | Sovereign state | 1952 | 16 | | |
| | Iceland | Full | Alþingi | Sovereign state | 1952 | 7 | | |
| | Norway | Full | The Storting | Sovereign state | 1952 | 20 | | |
| | Sweden | Full | The Riksdag | Sovereign state | 1952 | 20 | | |
| | Finland | Full | Eduskunta | Sovereign state | 1955 | 18 | | |
| | Greenland | Associate | Landsting | Self-governing region of the Danish Realm | 1984 | 2 | | |
| | Faroe Islands | Associate | Løgting | Self-governing region of the Danish Realm | 1970 | 2 | | |
| | Åland Islands | Associate | Lagting | Self-governing region of Finland | 1970 | 2 | | |
| | Estonia | Observers | | | | | | |
| | Latvia | Observers | | | | | | |
| | Lithuania | Observers | | | | | | |