As stated by the Department of Economic and Social Affairs of United Nations, the metropolitan area of Barcelona has a population of 5,083,000, according to the Organization for Economic Cooperation and Development has a population of 4,900,000 and according to the Eurostat has a population of 5,375,774. According to Idescat has a population of 5,029,181, according to BlatantWorld.com has a population of 4,992,778 and according to World Gazetteer has a population of 5,068,252.
First Zone: consists of other municipalities (outside Barcelona) in an official union of adjacent cities and municipalities called the Àrea Metropolitana de Barcelona (AMB) (also Greater Barcelona) with a population of 3,220,071 in area of 636 km2 (density 5.010 hab/km2).
Third Zone: considered territory of consolidated expansion. In this one the expansion passes to be of radial type, spreading across fluvial corridors or depressions, as in case of Manresa, Igualada and Vic, or continuing the coast, as in case of Blanes and El Vendrell.
According to the EURBANET project by Delft University of Technology it speaks about polynuclear urban region when there exists a series of important urban centers that relate intensely among them and to the exterior. This one is the case of bordering zones to the urban region that they extend around the cities of Tarragona and Girona. They are areas with a great economic dependence and services to the capital. They are narrow corridors well communicated to Barcelona, both by highway and railroad, which there fuse the metropolitan areas of these cities with the urban region. The PUR of Barcelona would rely on so 6.103.221 people in an area of 6.005 km 2.
Barcelona Polynuclear Urban Region is conceived as "isolated islands of significant growth" which, may develop into zones of global economic integration. This is, however, not intended to happen at the cost of the global competitive position of the present core area.
Municipalities of metropolitan area - population and area