Zagreb
- Aire Métropolitaine de Lyon
- Área Metropolitana de Lisboa
- Área Metropolitana do Porto
- Athens
- Brno City Municipality
- Brussels-Capital Region
- Bucharest Metropolitan Area
- Capital Region Berlin-Brandenburg
- CIM Cávado
- Città Metropolitana di Genova
- Città Metropolitana di Milano
- Città Metropolitana di Napoli
- Città Metropolitana di Roma Capitale
- Città Metropolitana di Torino
- City of Oslo and Akershus County
- Coimbra Region
- Emilia-Romagna
- Eurométropole de Strasbourg
- Gdańsk-Gdynia-Sopot Metropolitan Area
- Gipúzkoa – San Sebastián
- Glasgow
- Górnośląsko-Zagłębiowska Metropolia
- Helsinki
- Ile-de-France
- Instytut Rozwoju Terytorialnego – Lower Silesia
- Intercommunity Development Iasi Metropolitan Area Association – IDIMAA
- Kyiv
- Lviv
- Mazovian Office for Regional Planning in Warsaw
- Metropolitan Region Frankfurt/Rhein-Main
- Metropolregion Hamburg
- Metropolregion Mitteldeutschland
- Metropolregion Nürnberg
- Metropolregion Rheinland
- Metropool Regio Amsterdam
- Metropoolregio Rotterdam / Den Haag
- Observer / INU Piemonte e Valle d’Aosta
- Oradea
- Pais-Vasco / Basque Government
- Provincie Zuid-Holland
- Region Skåne
- Riga
- Sofia
- Stockholm
- The Gothenburg Region
- Thessaloniki
- Veneto
- Verband Region Rhein-Neckar
- Verband Region Stuttgart
- Warsaw Metropolitan Area
- West Midlands
- West Pomerania
- Wien
- Wrocław
- Zagreb
