| Troyan to Oignies | 1,149.66 mi (1,850.19 km) |
| Troyan to Oissel | 1,210.15 mi (1,947.55 km) |
| Troyan to Olivet | 1,154.73 mi (1,858.36 km) |
| Troyan to Ollioules | 951.49 mi (1,531.28 km) |
| Troyan to Olonne-sur-Mer | 1,318.44 mi (2,121.83 km) |
| Troyan to Oloron-Sainte-Marie | 1,274.11 mi (2,050.48 km) |
| Troyan to Onet Village | 1,107.82 mi (1,782.87 km) |
| Troyan to Onnaing | 1,122.67 mi (1,806.76 km) |
| Troyan to Orange | 998.84 mi (1,607.47 km) |
| Troyan to Orchies | 1,139.35 mi (1,833.61 km) |
| Troyan to Orleans | 1,154.76 mi (1,858.41 km) |
| Troyan to Orly | 1,143.67 mi (1,840.56 km) |
| Troyan to Ormesson-sur-Marne | 1,137.83 mi (1,831.15 km) |
| Troyan to Orsay | 1,152.15 mi (1,854.21 km) |
| Troyan to Orthez | 1,279.68 mi (2,059.45 km) |
