UpAlphabetical listing of Places in Spain
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Ona | city | Castilla y Leon | Spain | 42.73 | -3.41 | 2578 | 877 |
| Onamio | city | Castilla y Leon | Spain | 42.56 | -6.50 | 2509 | 6359 |
| Onao | city | Asturias | Spain | 43.36 | -5.09 | 830 | 3508 |
| Onarte | city | Euskadi | Spain | 43.30 | -2.76 | 830 | 7714 |
| Oncala | city | Castilla y Leon | Spain | 41.97 | -2.31 | 4416 | 224 |
| Oncebreros | city | Castilla-La Mancha | Spain | 38.96 | -1.50 | 3349 | 576 |
| Oncebreros | city | Castilla-La Mancha | Spain | 38.93 | -2.14 | 2509 | 1425 |
| Oncina de la Valdoncina | city | Castilla y Leon | Spain | 42.55 | -5.66 | 2837 | 21413 |
| Oncins | city | Aragon | Spain | 42.46 | 0.21 | 3687 | 339 |
| Onda | city | Comunitat Valenciana | Spain | 39.97 | -0.25 | 830 | 16661 |
| Ondara | city | Comunitat Valenciana | Spain | 38.83 | 0.02 | 134 | 29312 |
| Ondarra | city | Euskadi | Spain | 42.98 | -2.29 | 1669 | 3583 |
| Ondarraldea | city | Euskadi | Spain | 42.98 | -2.29 | 1669 | 3583 |
| Ondategi | city | Euskadi | Spain | 42.96 | -2.74 | 1958 | 4726 |
| Ondategui | city | Euskadi | Spain | 42.96 | -2.74 | 1958 | 4726 |
| Ondes | city | Asturias | Spain | 43.26 | -6.22 | 2762 | 1087 |
| Ondárroa | city | Euskadi | Spain | 43.33 | -2.42 | 52 | 14110 |
| Oneta | city | Asturias | Spain | 43.46 | -6.67 | 1781 | 3821 |
| Ongayo | city | Cantabria | Spain | 43.41 | -4.06 | 272 | 20881 |
| Ongoz | city | Navarra | Spain | 42.80 | -1.24 | 2509 | 153 |
| Onil | city | Comunitat Valenciana | Spain | 38.63 | -0.67 | 2509 | 14393 |
| Onitar | city | Andalucia | Spain | 37.44 | -3.61 | 3349 | 2691 |
| Onon | city | Asturias | Spain | 43.50 | -5.40 | 830 | 5864 |
| Onraita | city | Euskadi | Spain | 42.80 | -2.40 | 3349 | 2911 |
| Onraita/Erroeta | city | Euskadi | Spain | 42.80 | -2.40 | 3349 | 2911 |
| Ons | city | Galicia | Spain | 42.88 | -8.73 | 830 | 5583 |
| Onsares | city | Andalucia | Spain | 38.46 | -2.61 | 3349 | 1071 |
| Ontalba | city | Castilla-La Mancha | Spain | 40.08 | -3.81 | 1745 | 11607 |
| Ontalbilla de Valcorba | city | Castilla y Leon | Spain | 41.76 | -2.37 | 3441 | 1856 |
| Ontalvilla de Valcorba | city | Castilla y Leon | Spain | 41.76 | -2.37 | 3441 | 1856 |
| Ontaneda | city | Cantabria | Spain | 43.20 | -3.92 | 830 | 1392 |
| Ontar | city | Castilla-La Mancha | Spain | 38.62 | -1.50 | 2509 | 3366 |
| Onteniente | city | Comunitat Valenciana | Spain | 38.82 | -0.60 | 1669 | 28307 |
| Ontinar del Salz | city | Aragon | Spain | 41.94 | -0.76 | 964 | 1429 |
| Ontinyent | city | Comunitat Valenciana | Spain | 38.82 | -0.60 | 1669 | 28307 |
| Ontiñena | city | Aragon | Spain | 41.68 | 0.09 | 830 | 821 |
| Onton | city | Cantabria | Spain | 43.35 | -3.17 | 370 | 14051 |
| Ontoria | city | Cantabria | Spain | 43.31 | -4.21 | 403 | 10028 |
| Ontur | city | Castilla-La Mancha | Spain | 38.62 | -1.50 | 2509 | 3366 |
| Ontígola | city | Castilla-La Mancha | Spain | 40.00 | -3.57 | 2080 | 18734 |
| Onubo | city | Andalucia | Spain | 37.27 | -6.94 | 98 | 83400 |
| Onzonilla | city | Castilla y Leon | Spain | 42.52 | -5.58 | 2604 | 36164 |
| Onáyar | city | Andalucia | Spain | 36.75 | -2.84 | 167 | 21892 |
| Onís | city | Asturias | Spain | 43.33 | -4.97 | 1062 | 1205 |
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