| Preston to Octeville | 289.05 mi (465.18 km) |
| Preston to Oignies | 331.48 mi (533.47 km) |
| Preston to Oissel | 345.80 mi (556.52 km) |
| Preston to Olivet | 453.89 mi (730.47 km) |
| Preston to Ollioules | 830.35 mi (1,336.32 km) |
| Preston to Olonne-sur-Mer | 500.72 mi (805.84 km) |
| Preston to Oloron-Sainte-Marie | 736.14 mi (1,184.70 km) |
| Preston to Onet Village | 691.36 mi (1,112.63 km) |
| Preston to Onnaing | 354.41 mi (570.36 km) |
| Preston to Orange | 745.99 mi (1,200.55 km) |
| Preston to Orchies | 339.02 mi (545.60 km) |
| Preston to Orleans | 451.63 mi (726.83 km) |
| Preston to Orly | 410.32 mi (660.35 km) |
| Preston to Ormesson-sur-Marne | 411.24 mi (661.83 km) |
| Preston to Orsay | 408.40 mi (657.26 km) |
