The current postal code system in Spain uses a five digit format and was first introduced in 1985. The first two digits (ranging 01–52) of the postal code correspond to one of the fifty provinces of Spain and the two autonomous cities on the North African coast.
| Province/Autonomous City | Postal Code Prefix |
|---|---|
| A Coruña | 15xxx |
| Albacete | 02xxx |
| Alicante | 03xxx |
| Almería | 04xxx |
| Araba/Álava | 01xxx |
| Asturias/Asturies | 33xxx |
| Ávila | 05xxx |
| Badajoz | 06xxx |
| Barcelona | 08xxx |
| Bizkaia | 48xxx |
| Burgos | 09xxx |
| Cáceres | 10xxx |
| Cádiz | 11xxx |
| Cantabria | 39xxx |
| Castellón/Castelló | 12xxx |
| Ceuta | 52xxx |
| Ciudad Real | 13xxx |
| Comunidad de Madrid | 28xxx |
| Córdoba | 14xxx |
| Cuenca | 16xxx |
| Gipuzkoa | 20xxx |
| Girona | 17xxx |
| Granada | 18xxx |
| Guadalajara | 19xxx |
| Huelva | 21xxx |
| Huesca | 22xxx |
| Illes Balears | 07xxx |
| Jaén | 23xxx |
| La Rioja | 26xxx |
| Las Palmas | 35xxx |
| León | 24xxx |
| Lleida | 25xxx |
| Lugo | 27xxx |
| Málaga | 29xxx |
| Melilla | 51xxx |
| Navarra / Nafarroa | 31xxx |
| Ourense | 32xxx |
| Palencia | 34xxx |
| Pontevedra | 36xxx |
| Murcia | 30xxx |
| Salamanca | 37xxx |
| Santa Cruz de Tenerife | 38xxx |
| Segovia | 40xxx |
| Sevilla | 41xxx |
| Soria | 42xxx |
| Tarragona | 43xxx |
| Teruel | 44xxx |
| Toledo | 45xxx |
| Valencia/València | 46xxx |
| Valladolid | 47xxx |
| Zamora | 49xxx |
| Zaragoza | 50xxx |