UpAlphabetical listing of Places in Spain
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Oiardo | city | Euskadi | Spain | 42.99 | -2.93 | 2509 | 2842 |
| Oibar | city | Navarra | Spain | 42.59 | -1.36 | 1669 | 1851 |
| Oieregi | city | Navarra | Spain | 43.14 | -1.62 | 830 | 2443 |
| Oikia | city | Euskadi | Spain | 43.28 | -2.23 | 347 | 21396 |
| Oimbra | city | Galicia | Spain | 41.89 | -7.47 | 1145 | 6123 |
| Oin | city | Galicia | Spain | 42.77 | -8.68 | 82 | 8822 |
| Oinés | city | Galicia | Spain | 42.95 | -8.25 | 1181 | 2847 |
| Oion / Oyón | city | Euskadi | Spain | 42.51 | -2.44 | 1669 | 52159 |
| Oiquina | city | Euskadi | Spain | 43.28 | -2.23 | 347 | 21396 |
| Oiras | city | Galicia | Spain | 43.48 | -7.43 | 1784 | 2914 |
| Oirám | city | Galicia | Spain | 43.52 | -7.33 | 830 | 5028 |
| Oirán | city | Galicia | Spain | 43.52 | -7.33 | 830 | 5028 |
| Oirós | city | Galicia | Spain | 42.77 | -8.18 | 1820 | 3241 |
| Ois | city | Galicia | Spain | 43.25 | -8.12 | 830 | 3745 |
| Ois | city | Galicia | Spain | 43.23 | -8.12 | 1007 | 2352 |
| Oitavén | city | Galicia | Spain | 42.33 | -8.48 | 1184 | 2353 |
| Oitura | city | Aragon | Spain | 41.73 | -1.19 | 830 | 6288 |
| Oitz | city | Navarra | Spain | 43.11 | -1.69 | 830 | 2954 |
| Oix | city | Cataluna | Spain | 42.27 | 2.53 | 1669 | 2318 |
| Oiz | city | Navarra | Spain | 43.11 | -1.69 | 830 | 2954 |
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