- the Federal Council of Germany (Bundesrat);
- the Federal Council of Austria (Bundesrat);
- the Belgian Senate;
- the House of Peoples of the Parliamentary Assembly of Bosnia-Herzegovina
- the Spanish Senate,
- the Senate of the French Republic,
- the Italian Senate ;
- the First Chamber of the States General of the Netherlands;
- the Polish Senate;
- the Romanian Senate ;
- the Federation Council of the Federal Assembly of the Russian Federation
- the National Council of Slovenia ;
- the Swiss Council of States ;
- the Senate of the Czech Republic ;
- the House of Lords of the United Kingdom of Great Britain and Northern Ireland.
The Council of State of the Grand Duchy of Luxembourg shall participate in the activities of the Association in the capacity of observer.