| Santo Tirso to Octeville | 660.90 mi (1,063.62 km) |
| Santo Tirso to Oignies | 835.98 mi (1,345.38 km) |
| Santo Tirso to Oissel | 721.11 mi (1,160.51 km) |
| Santo Tirso to Olivet | 679.92 mi (1,094.23 km) |
| Santo Tirso to Ollioules | 741.82 mi (1,193.84 km) |
| Santo Tirso to Olonne-sur-Mer | 489.70 mi (788.10 km) |
| Santo Tirso to Oloron-Sainte-Marie | 421.78 mi (678.78 km) |
| Santo Tirso to Onet Village | 597.56 mi (961.68 km) |
| Santo Tirso to Onnaing | 851.36 mi (1,370.13 km) |
| Santo Tirso to Orange | 700.18 mi (1,126.83 km) |
| Santo Tirso to Orchies | 844.14 mi (1,358.50 km) |
| Santo Tirso to Orleans | 681.86 mi (1,097.35 km) |
| Santo Tirso to Orly | 735.72 mi (1,184.03 km) |
| Santo Tirso to Ormesson-sur-Marne | 742.66 mi (1,195.20 km) |
| Santo Tirso to Orsay | 726.53 mi (1,169.24 km) |
