Immigration and Demographic Issues
The most important metropolitan areas in 2005 are:

Madrid 5,646,572[3]
Barcelona 3,135,758[4]
Valencia 1,623,724
Seville 1,317,098
Málaga 1,074,074
Bilbao 947,581
Asturias (Gijón-Oviedo) 855,199
Alicante-Elche 711,215
Zaragoza 683,763
Las Palmas de Gran Canaria 616,903
Bahía de Cádiz (Cádiz-Jerez de la Frontera) 615,494
Murcia 563,272
Palma de Mallorca 474,035
Granada 472,638
Vigo 423,821
Santa Cruz de Tenerife 420,198
San Sebastián 399,125
A Coruña 396,015
Valladolid 383,894
Tarragona 375,749
Cordoba 321,164
Pamplona 309,631 Metropolitan areas
Population: 44,708,964 (January 2006)
Age structure (2000 est.): 0-14 years: 14.4% (male 3,000,686/female 2,821,325) 15-64 years: 67.8% (male 13,751,963/female 13,653,426) 65 years and over: 17.7% (male 2,993,496/female 4,176,946) (2006 est.)
Population growth rate: 0.13% (2006 est.)
Birth rate: 10.06 births/1,000 population (2006 est.)
Death rate: 9.72 deaths/1,000 population (2006 est.)
Net migration rate: 15 migrant(s)/1,000 population (2006 est.)
Languages:
Others with no official status:
Literacy: definition: age 15 and over can read and write total population: 97.9% (2003 est.) male: 98.7% (2003 est.) female: 97.2% (2003 est.)

Spanish (official) 100%
Catalan 10% (co-official in Catalonia, Balearic Islands, and Valencia — see Valencian)
Galician 6% (co-official in Galicia)
Basque 1.6% (co-official in Basque Country and designated areas in Navarre).
Aranese (a variant of Gascon Occitan) is co-official in Val d'Aran, a small valley in the Pyreenes.
Asturian (in Asturias and part of Leon province)
Aragonese (in Huesca province, Aragon) Educational system