| Grumo Nevano to Oria | 178.82 mi (287.78 km) |
| Grumo Nevano to Oristano | 306.78 mi (493.72 km) |
| Grumo Nevano to Orta Nova | 80.04 mi (128.81 km) |
| Grumo Nevano to Orte | 143.33 mi (230.66 km) |
| Grumo Nevano to Ortona | 98.13 mi (157.92 km) |
| Grumo Nevano to Orvieto | 165.93 mi (267.04 km) |
| Grumo Nevano to Orzinuovi | 377.94 mi (608.23 km) |
| Grumo Nevano to Osimo | 180.69 mi (290.79 km) |
| Grumo Nevano to Ospitaletto | 382.66 mi (615.84 km) |
| Grumo Nevano to Ostuni | 173.92 mi (279.90 km) |
| Grumo Nevano to Ottaviano | 12.42 mi (19.99 km) |
| Grumo Nevano to Ovada | 382.95 mi (616.30 km) |
| Grumo Nevano to Ozieri | 276.47 mi (444.94 km) |
| Grumo Nevano to Paceco | 223.44 mi (359.59 km) |
| Grumo Nevano to Pachino | 294.77 mi (474.38 km) |
