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| Name | Population | Metropolitan area, if not the center city |
| Alcalá de Henares | 0.2 | Madrid |
| Barcelona | 5.1 | |
| Madrid | 6.4 | |
| Sevilla | 1.9 | |
| Valencia | 2.5 |
| Name | Alternate names |
| A Coruña (see A Coruña-Oleiros-Arteixo) | |
| A Coruña-Oleiros-Arteixo | |
| Alicante (see Alicante-Elche) | |
| Alicante-Elche | |
| Aranjuez | |
| Arteixo (see A Coruña-Oleiros-Arteixo) | |
| Ávila | |
| Barakaldo (see Bilbao) | |
| Avilés (see Oviedo-Gijón-Avilés) | |
| Bilbao | |
| Burgos | |
| Cáceres | |
| Cádiz | Gades, قادس (Qādis) |
| Calatayud | |
| Córdoba | قرطبة (Qurtuba) |
| Cuenca | |
| Elche (see Alicante-Elche) | |
| Gasteiz (see Vitoria-Gasteiz) | |
| Getxo, see Bilbao | |
| Gijón (see Oviedo-Gijón-Avilés) | |
| Granada | غرناطة (Ġarnāṭah) |
| Ibiza (Town) | |
| León | |
| Logroño | |
| Lugo | |
| Mérida | Avgvsta Emerita |
| Oleiros (see A Coruña-Oleiros-Arteixo) | |
| Oviedo (see Oviedo-Gijón-Avilés) | |
| Oviedo-Gijón-Avilés | |
| Palma de Mallorca | |
| Pamplona | |
| Ponferrada | |
| Portugalete, see Bilbao | |
| el Prat de Llobregat, see Barcelona | |
| Sant Antoni de Portmany | |
| Salamanca | |
| Sanlúcar de Barrameda | |
| San Sebastián | |
| Santiago de Compostela | |
| Segovia | |
| Tarragona | Tarraco |
| Teruel | |
| Toledo | Toletvm |
| Úbeda | |
| Vitoria-Gasteiz | |
| Vitoria (see Vitoria-Gasteiz) | |
| Zaragoza |
1. In millions. Metropolitan population for center cities, otherwise city population.
2. Side bar of the cities Wikipedia article (en.m.wikipedia.org/wiki/{city_name}), accessed 12/28/2015. As of 2014 for Alcalá de Henares.
3. Eurostat Larger urban zone (2014) colum of en.m.wikipedia.org/wiki/List_of_metropolitan_areas_in_Europe, accessed 12/28/2015.
4. 2012 figure from world-gazetteer.com, accessed 2/6/2103.
5. Seville in English. Formerly Spalis and إشبيلية (Ishbīliya).