| Gengenbach to Novi di Modena | 278.19 mi (447.70 km) |
| Gengenbach to Novi Ligure | 254.19 mi (409.08 km) |
| Gengenbach to Nuoro | 562.25 mi (904.86 km) |
| Gengenbach to Occhiobello | 293.75 mi (472.74 km) |
| Gengenbach to Oderzo | 277.56 mi (446.69 km) |
| Gengenbach to Oggiono | 191.36 mi (307.96 km) |
| Gengenbach to Olbia | 522.13 mi (840.29 km) |
| Gengenbach to Oleggio | 195.63 mi (314.83 km) |
| Gengenbach to Olgiate Comasco | 186.23 mi (299.71 km) |
| Gengenbach to Olgiate Olona | 195.47 mi (314.57 km) |
| Gengenbach to Omegna | 175.21 mi (281.97 km) |
| Gengenbach to Opera | 215.99 mi (347.60 km) |
| Gengenbach to Oppeano | 261.23 mi (420.41 km) |
| Gengenbach to Orbassano | 235.51 mi (379.02 km) |
| Gengenbach to Orbetello | 439.93 mi (708.00 km) |
