| Gross-Gerau to Novi di Modena | 365.11 mi (587.59 km) |
| Gross-Gerau to Novi Ligure | 356.80 mi (574.21 km) |
| Gross-Gerau to Nuoro | 664.74 mi (1,069.80 km) |
| Gross-Gerau to Occhiobello | 374.33 mi (602.42 km) |
| Gross-Gerau to Oderzo | 340.90 mi (548.63 km) |
| Gross-Gerau to Oggiono | 288.56 mi (464.39 km) |
| Gross-Gerau to Olbia | 623.94 mi (1,004.14 km) |
| Gross-Gerau to Oleggio | 298.51 mi (480.40 km) |
| Gross-Gerau to Olgiate Comasco | 286.63 mi (461.29 km) |
| Gross-Gerau to Olgiate Olona | 296.70 mi (477.50 km) |
| Gross-Gerau to Omegna | 279.24 mi (449.39 km) |
| Gross-Gerau to Opera | 315.24 mi (507.33 km) |
| Gross-Gerau to Oppeano | 342.95 mi (551.93 km) |
| Gross-Gerau to Orbassano | 342.25 mi (550.80 km) |
| Gross-Gerau to Orbetello | 532.92 mi (857.66 km) |
