The name 'Brasília' is commonly used as a synonym for the Federal District through synecdoche; However, the Federal District is composed of 31 administrative regions, only one of which is Brasília proper, with a population of 209,926 in a 2011 survey; Demographic publications generally do not make this distinction and list the population of Brasília as synonymous with the population of the Federal District, considering the whole of it as its metropolitan area.