| Gengenbach to Octeville | 445.55 mi (717.05 km) |
| Gengenbach to Oignies | 267.08 mi (429.83 km) |
| Gengenbach to Oissel | 321.27 mi (517.03 km) |
| Gengenbach to Olivet | 284.38 mi (457.67 km) |
| Gengenbach to Ollioules | 378.17 mi (608.61 km) |
| Gengenbach to Olonne-sur-Mer | 474.65 mi (763.88 km) |
| Gengenbach to Oloron-Sainte-Marie | 548.88 mi (883.34 km) |
| Gengenbach to Onet Village | 379.96 mi (611.49 km) |
| Gengenbach to Onnaing | 241.48 mi (388.63 km) |
| Gengenbach to Orange | 331.84 mi (534.04 km) |
| Gengenbach to Orchies | 257.85 mi (414.97 km) |
| Gengenbach to Orleans | 283.56 mi (456.34 km) |
| Gengenbach to Orly | 258.15 mi (415.45 km) |
| Gengenbach to Ormesson-sur-Marne | 251.71 mi (405.10 km) |
| Gengenbach to Orsay | 267.35 mi (430.25 km) |
