| Zaidín | Huesca | 22530 | 1 |
| Zalamea de la Serena | Badajoz | 06430 | 1 |
| Zalamea la Real | Huelva | 21640–21649 | 2 |
| Zaldibar | Bizkaia | 48250 | 1 |
| Zaldibia | Gipuzkoa | 20247 | 1 |
| Zalla | Bizkaia | 48850–48860 | 2 |
| Zamora | Zamora | 49001–49032 | 32 |
| Zamudio | Bizkaia | 48170 | 1 |
| Zaorejas | Guadalajara | 19444–19495 | 2 |
| Zaragoza | Zaragoza | 50001–50820 | 31 |
| Zaratán | Valladolid | 47610 | 1 |
| Zarautz | Gipuzkoa | 20800 | 1 |
| Zarra | Valencia | 46621 | 1 |
| Zarza de Granadilla | Cáceres | 10710 | 1 |
| Zarza, La | Badajoz | 06830 | 1 |
| Zarza, La | Valladolid | 47452 | 1 |
| Zarza-Capilla | Badajoz | 06611 | 1 |
| Zarzalejo | Madrid | 28293 | 1 |
| Zarzuela del Monte | Segovia | 40152 | 1 |
| Zarzuela del Pinar | Segovia | 40293 | 1 |
| Zas | A Coruña | 15656–15859 | 8 |
| Zeanuri | Bizkaia | 48144 | 1 |
| Zegama | Gipuzkoa | 20215 | 1 |
| Zestoa | Gipuzkoa | 20740 | 1 |
| Zierbena | Bizkaia | 48508 | 1 |
| Zigoitia | Álava | 01138–01196 | 2 |
| Ziordia | Navarra | 31809 | 1 |
| Zizur Mayor/Zizur Nagusia | Navarra | 31180 | 1 |
| Zizurkil | Gipuzkoa | 20159 | 1 |
| Zorita | Cáceres | 10130 | 1 |
| Zorita de la Frontera | Salamanca | 37408 | 1 |
| Zotes del Páramo | León | 24791 | 1 |
| Zubieta | Navarra | 31746 | 1 |
| Zucaina | Castellón | 12125 | 1 |
| Zuera | Zaragoza | 50800–50810 | 2 |
| Zufre | Huelva | 21210 | 1 |
| Zugarramurdi | Navarra | 31710 | 1 |
| Zuheros | Córdoba | 14870 | 1 |
| Zuia | Álava | 01130–01139 | 2 |
| Zumaia | Gipuzkoa | 20750 | 1 |
| Zurgena | Almería | 04650–04662 | 3 |
| Zújar | Granada | 18811 | 1 |
| Zúñiga | Navarra | 31284 | 1 |
| Àger | Lleida | 25611–25692 | 3 |
| Ágreda | Soria | 42005–42108 | 4 |
| Águilas | Murcia | 30880–30889 | 2 |
| Álamo, El | Madrid | 28607–28807 | 2 |
| Álora | Málaga | 29500–29593 | 3 |
| Ávila | Ávila | 05001–05195 | 7 |
| Écija | Sevilla | 41400–41567 | 4 |
| Épila | Zaragoza | 50290–50590 | 2 |
| Íscar | Valladolid | 47420 | 1 |
| Òdena | Barcelona | 08711 | 1 |
| Òrrius | Barcelona | 08317 | 1 |
| Ólvega | Soria | 42110 | 1 |
| Órgiva | Granada | 18400 | 1 |
| Úbeda | Jaén | 23314–23509 | 4 |