Postal codes in Spain
Postal codes were introduced in Spain in 1976, when CTT introduced automated sorting. The first two digits of the postal code represents the province, in alphabetical order:
02xxx Albacete 03xxx Alicante 08xxx Barcelona 11xxx Cadiz 28xxx Madrid 29xxx Malaga 50xxx Zaragoza
Large cities such as Madrid and Barcelona, were divided into postal districts (zonas in Spanish)
Plaza de España, 18 Madrid 8
Travessera de Gracia, 68 –70, 1º. Barcelona 6
These former postal districts were incorporated into the five-digit postal code:
Plaza de España, 18 28008 Madrid
Travessera de Gracia, 68 –70, 1º. 08006 Barcelona