Lisbon has a population size of 5.
Lisbon ( [ ˈlɪzbən ] Lisboa , [ liʒˈβoɐ ] ) is the capital and the largest city of Portugal , with a population of 552,700 within its administrative limits in an area of 100.05 km ² . Its urban area extends beyond the city 's administrative limits with a population of around 2.7 million people , being the 11th-most populous urban area in the European Union . About 2.8 million people live in the Lisbon Metropolitan Area ( which represents approximately 27 % of the country 's population ) .