réunir par les échanges, l'amitié et le culte tous les chrétiens qui n'adhèrent pas au dogme de la Trinité
liste des congrégations (pour l’Ulster, une carte du site des NSPI en donne la localisation) :
Presbytary of Antrim (Ulster) :
Antrim (First / Old Presbyterian Congregation), Ballycarry (Old Presbyterian Church), Ballyclare (Old Presbyterian Church), Ballymoney (NSP Congregation), Belfast (All Souls), Belfast (First Presbyterian Church), Cairncastle (Old Presbyterian Church), Crumlin (Old Presbyterian Church), Downpatrick (First Presbyterian Church), Dunmurry (First Presbyterian Church), Glenarm (Old Presbyterian Church), Greyabbey (First NS Presbyterian Church), Holywood (First NS Presbyterian Church), Larne & Kilwaughter (Old Presbyterian Church), Newtownards (NS Presbyterian Church), Raloo (NS Presbyterian Church), Templepatrick (Old Presbyterian Church).
Presbytary of Bangor (Ulster) :
Ballee (NS Presbyterian Church), Ballyhemlin (Meeting House), Banbridge (First Presbyterian Church), Belfast (Mountpottinger NS Presbyterian Church), Clough (NS Presbyterian Church), Comber (NS Presbyterian Church), Dromore (First Presbyterian Church), Killinchy (NS Presbyterian Church), Moira (First NS Presbyterian Church), Moneyreagh (NS Presbyterian Church), Newry (First NS Presbyterian), Rademon (First Kilmore Church), Ravara (NS Presbyterian Church), Warrenpoint (First Presbyterian Church).
Synod of Munster (Irlande)
Cork (Unitarian Church), Dublin (Unitarian Church).
Les presbytériens non-souscrivants d'Irlande sont en partenariat avec l'Unitarian Christian Association (UCA) et leurs congrégations font désormais partie de cette association.
Les chrétiens unitariens de l’Assemblée fraternelle des chrétiens unitariens (AFCU) et de la Congregazione italiana cristiana unitariana (CICU) sont en relation avec les presbytériens non-souscrivants au sein du Réseau européen des protestants libéraux (ELPN).