| Grimmen to Novi di Modena | 643.93 mi (1,036.30 km) |
| Grimmen to Novi Ligure | 673.47 mi (1,083.84 km) |
| Grimmen to Nuoro | 968.44 mi (1,558.55 km) |
| Grimmen to Occhiobello | 638.19 mi (1,027.07 km) |
| Grimmen to Oderzo | 576.00 mi (926.99 km) |
| Grimmen to Oggiono | 598.06 mi (962.48 km) |
| Grimmen to Olbia | 926.13 mi (1,490.46 km) |
| Grimmen to Oleggio | 619.60 mi (997.15 km) |
| Grimmen to Olgiate Comasco | 602.91 mi (970.29 km) |
| Grimmen to Olgiate Olona | 613.98 mi (988.11 km) |
| Grimmen to Omegna | 604.55 mi (972.92 km) |
| Grimmen to Opera | 626.43 mi (1,008.14 km) |
| Grimmen to Oppeano | 614.29 mi (988.61 km) |
| Grimmen to Orbassano | 675.08 mi (1,086.44 km) |
| Grimmen to Orbetello | 810.66 mi (1,304.63 km) |
