| Monte Porzio Catone to Octeville | 875.57 mi (1,409.09 km) |
| Monte Porzio Catone to Oignies | 756.33 mi (1,217.20 km) |
| Monte Porzio Catone to Oissel | 764.18 mi (1,229.83 km) |
| Monte Porzio Catone to Olivet | 673.74 mi (1,084.28 km) |
| Monte Porzio Catone to Ollioules | 361.69 mi (582.08 km) |
| Monte Porzio Catone to Olonne-sur-Mer | 787.02 mi (1,266.59 km) |
| Monte Porzio Catone to Oloron-Sainte-Marie | 684.54 mi (1,101.66 km) |
| Monte Porzio Catone to Onet Village | 539.85 mi (868.80 km) |
| Monte Porzio Catone to Onnaing | 734.73 mi (1,182.43 km) |
| Monte Porzio Catone to Orange | 430.46 mi (692.75 km) |
| Monte Porzio Catone to Orchies | 749.37 mi (1,206.00 km) |
| Monte Porzio Catone to Orleans | 674.93 mi (1,086.19 km) |
| Monte Porzio Catone to Orly | 692.39 mi (1,114.30 km) |
| Monte Porzio Catone to Ormesson-sur-Marne | 689.20 mi (1,109.16 km) |
| Monte Porzio Catone to Orsay | 697.61 mi (1,122.69 km) |
