- Baden-Württemberg, Germany
- Bretagne, France
- Generalitat de Catalunya, Spain
- Gobierno de las Islas Baleares, Spain
- Gobierno Vasco, Spain
- Jämtland County Council, Sweden
- Junta de Andalucia, Spain
- Lower Austria, Austria
- Madona Council, Latvia
- Östsam Regional Development Council, Sweden
- Pest County, Hungary
- Provincia Autonoma di Trento, Italy
- Provincia di Livorno, Italy
- Region Västra Götaland, Sweden
- Regione Lazio, Italy
- Regione Marche, Italy
- Region of Southern Denmark
- Regione Piemonte, Italy
- Regione Toscana, Italy
- Rheinland-Pfalz, Germany
- Scottish Government, UK
- Vidin District, Bulgaria
- Welsh Assembly Government, UK
The following organisations are observers:
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