Lisbon is part of Portugal.
Lisbon . The Lisbon region contributes with a higher GDP PPP per capita than any other region in Portugal . Unlike most capital cities , Lisbon 's status as the capital of Portugal has never been granted or confirmed officially -- by statute or in written form . Oeiras ( [ oˈɐjɾɐʃ ] ) is a municipality in western part of the Lisbon Metropolitan Area , subregion of Greater Lisbon , in continental Portugal .