| Grimsby to Orbetello | 926.92 mi (1,491.73 km) |
| Grimsby to Oria | 1,222.51 mi (1,967.45 km) |
| Grimsby to Oristano | 1,027.59 mi (1,653.74 km) |
| Grimsby to Orta Nova | 1,117.09 mi (1,797.79 km) |
| Grimsby to Orte | 956.72 mi (1,539.69 km) |
| Grimsby to Ortona | 1,020.55 mi (1,642.42 km) |
| Grimsby to Orvieto | 934.15 mi (1,503.37 km) |
| Grimsby to Orzinuovi | 720.02 mi (1,158.77 km) |
| Grimsby to Osimo | 929.97 mi (1,496.64 km) |
| Grimsby to Ospitaletto | 715.17 mi (1,150.96 km) |
| Grimsby to Ostuni | 1,208.02 mi (1,944.12 km) |
| Grimsby to Ottaviano | 1,108.59 mi (1,784.11 km) |
| Grimsby to Ovada | 731.18 mi (1,176.71 km) |
| Grimsby to Ozieri | 991.76 mi (1,596.09 km) |
| Grimsby to Paceco | 1,232.70 mi (1,983.83 km) |
