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| Cities of Spain starting with the letter O (See below for Region Code descriptions) | ||
| Ogijares (AN) | Oiartzun (BS) | Ojen (AN) |
| Oleiros (GA) | Olite (NA) | Oliva (VC) |
| Olivenza (EX) | Olot (CA) | Onati (BS) |
| Orcoyen (NA) | Orense (GA) | Orgiva (AN) |
| Orient (BA) | Orihuela (VC) | Oropesa (CM) |
| Osorno la Mayor (CL) | Osuna (AN) | Oto (AR) |
| Ourense (GA) | Oviedo (AS) | |
| Provinces of Spain Select a region for a complete city directory. | ||
| (AN) - Andalucia | (AR) - Aragon | (AS) - Asturias |
| (BA) - Balearic Islands | (BS) - Basque Country | (CI) - Canary Islands |
| (CB) - Cantabria | (CM) - Castilla- La Mancha | (CL) - Castilla- Leon |
| (CA) - Catalonia | (EX) - Extremadura | (GA) - Galicia |
| (LR) - La Rioja | (MA) - Madrid | (MU) - Murcia |
| (NA) - Navarra | (VC) - Valencia | |
