Official name: City of Sejny
Postal address: ul. Wileńska 10, Sejny 16-500, Poland
Member Type: Local Authority
Official name: Sejny Commune
Postal address: ul. Jerzego Grodzińskiego 1, Sejny 16-500, Poland
Member Type: Local Authority
Official name: Krasnopol Commune
Postal address: ul. 1 Maja 14, Krasnopol 16-503, Poland
Member Type: Local Authority
Official name: Puńsk Commune
Postal address: ul. A. Mickiewicza 23, Puńsk 16-515, Poland
Member Type: Local Authority
Official name: Rutka-Tartak Commune
Postal address: ul. 3 Maja 13, Rutka-Tartak 16-406, Poland
Member Type: Local Authority
Official name: Jeleniewo Commune
Postal address: ul. Słoneczna 3, Jeleniewo 16-404, Poland
Member Type: Local Authority
Official name: Szypliszki Commune
Postal address: ul. Suwalska 21, Jeleniewo 16-411, Poland
Member Type: Local Authority
Official name: Wiżajny Commune
Postal address: Szkolna Street 11, Wiżajny 16-407, Poland
Member Type: Local Authority
Official name: Giby Commune
Postal address: Giby 74A, Giby 16-506, Poland
Member Type: Local Authority
Official name: Lazdijų rajono savivaldybė
Postal address: Vilniaus g. 1, Lazdijai 67106, Lithuania
Member Type: Regional Authority
Official name: Vilkaviškio rajono savivaldybė
Postal address: Neries g. 1, Vilkaviškis 70147, Lithuania
Member Type: Regional Authority
Official name: Kalvarijos savivaldybė
Postal address: Laisvės g. 2, Kalvarija 69214, Lithuania
Member Type: Regional Authority