| Marinha Grande to Octeville | 769.81 mi (1,238.89 km) |
| Marinha Grande to Oignies | 939.24 mi (1,511.57 km) |
| Marinha Grande to Oissel | 824.84 mi (1,327.45 km) |
| Marinha Grande to Olivet | 777.09 mi (1,250.60 km) |
| Marinha Grande to Ollioules | 799.27 mi (1,286.30 km) |
| Marinha Grande to Olonne-sur-Mer | 591.20 mi (951.45 km) |
| Marinha Grande to Oloron-Sainte-Marie | 492.06 mi (791.89 km) |
| Marinha Grande to Onet Village | 670.96 mi (1,079.81 km) |
| Marinha Grande to Onnaing | 953.46 mi (1,534.45 km) |
| Marinha Grande to Orange | 767.36 mi (1,234.95 km) |
| Marinha Grande to Orchies | 947.02 mi (1,524.08 km) |
| Marinha Grande to Orleans | 779.17 mi (1,253.95 km) |
| Marinha Grande to Orly | 835.12 mi (1,343.99 km) |
| Marinha Grande to Ormesson-sur-Marne | 841.91 mi (1,354.92 km) |
| Marinha Grande to Orsay | 826.19 mi (1,329.63 km) |
