| Gentilly to Oignies | 118.04 mi (189.97 km) |
| Gentilly to Oissel | 67.45 mi (108.55 km) |
| Gentilly to Olivet | 68.69 mi (110.55 km) |
| Gentilly to Ollioules | 426.46 mi (686.32 km) |
| Gentilly to Olonne-sur-Mer | 247.82 mi (398.83 km) |
| Gentilly to Oloron-Sainte-Marie | 413.18 mi (664.96 km) |
| Gentilly to Onet Village | 307.53 mi (494.93 km) |
| Gentilly to Onnaing | 122.41 mi (197.01 km) |
| Gentilly to Orange | 343.60 mi (552.97 km) |
| Gentilly to Orchies | 121.64 mi (195.77 km) |
| Gentilly to Orleans | 66.03 mi (106.26 km) |
| Gentilly to Orly | 5.28 mi (8.49 km) |
| Gentilly to Ormesson-sur-Marne | 9.03 mi (14.53 km) |
| Gentilly to Orsay | 10.70 mi (17.22 km) |
| Gentilly to Orthez | 396.91 mi (638.77 km) |
