| Arcos | Burgos | 09195–09239 | 2 |
| Arcos de Jalón | Soria | 42250–42259 | 3 |
| Arcos de la Frontera | Cádiz | 11620–11638 | 3 |
| Arcos de la Polvorosa | Zamora | 49699 | 1 |
| Arcos de la Sierra | Cuenca | 16141 | 1 |
| Arcos de las Salinas | Teruel | 44421 | 1 |
| Arcos, Los | Navarra | 31210 | 1 |
| Ardales | Málaga | 29550–29552 | 2 |
| Ardón | León | 24232–24233 | 2 |
| Areatza | Bizkaia | 48143 | 1 |
| Arellano | Navarra | 31263 | 1 |
| Arenal, El | Ávila | 05416 | 1 |
| Arenales de San Gregorio | Ciudad Real | 13619 | 1 |
| Arenas | Málaga | 29753 | 1 |
| Arenas de Iguña | Cantabria | 39450 | 1 |
| Arenas de San Juan | Ciudad Real | 13679 | 1 |
| Arenas de San Pedro | Ávila | 05400–05418 | 2 |
| Arenas del Rey | Granada | 18126 | 1 |
| Arenillas de Riopisuerga | Burgos | 09107 | 1 |
| Areny de Noguera / Arén | Huesca | 22583 | 1 |
| Arenys de Lledó / Arens de Lledó | Teruel | 44622 | 1 |
| Arenys de Munt | Barcelona | 08350–08358 | 2 |
| Arenzana de Abajo | La Rioja | 26311 | 1 |
| Arenzana de Arriba | La Rioja | 26312 | 1 |
| Ares | A Coruña | 15623–15625 | 3 |
| Ares del Maestrat | Castellón | 12165 | 1 |
| Areso | Navarra | 31876 | 1 |
| Aretxabaleta | Gipuzkoa | 20550 | 1 |
| Arevalillo de Cega | Segovia | 40185 | 1 |
| Argamasilla de Alba | Ciudad Real | 13170–13710 | 2 |
| Argamasilla de Calatrava | Ciudad Real | 13440 | 1 |
| Arganda del Rey | Madrid | 28500 | 1 |
| Arganza | León | 24410–24546 | 3 |
| Argavieso | Huesca | 22135 | 1 |
| Argañín | Zamora | 49251 | 1 |
| Argelaguer | Girona | 17853 | 1 |
| Argente | Teruel | 44165 | 1 |
| Argentona | Barcelona | 08310 | 1 |
| Argençola | Barcelona | 08717 | 1 |
| Arguedas | Navarra | 31513 | 1 |
| Arguis | Huesca | 22150 | 1 |
| Arguisuelas | Cuenca | 16360 | 1 |
| Argujillo | Zamora | 49716 | 1 |
| Argés | Toledo | 45122 | 1 |
| Ariany | Illes Balears | 07529 | 1 |
| Arico | Santa Cruz de Tenerife | 38580–38593 | 5 |
| Arija | Burgos | 09570 | 1 |
| Ariza | Zaragoza | 50220 | 1 |
| Ariño | Teruel | 44547 | 1 |
| Arjona | Jaén | 23760 | 1 |
| Arjonilla | Jaén | 23750 | 1 |
| Armallones | Guadalajara | 19461 | 1 |
| Armenteros | Salamanca | 37753–37756 | 4 |
| Armilla | Granada | 18100 | 1 |
| Armiñón | Burgos | 01211–01220 | 2 |
| Armuña | Segovia | 40191–40494 | 3 |
| Armuña de Almanzora | Almería | 04888 | 1 |
| Armuña de Tajuña | Guadalajara | 19135 | 1 |
| Arnedillo | La Rioja | 26585–26589 | 2 |
| Arnedo | La Rioja | 26250–26580 | 2 |