| Grantham to Orbetello | 907.51 mi (1,460.50 km) |
| Grantham to Oria | 1,212.13 mi (1,950.74 km) |
| Grantham to Oristano | 998.90 mi (1,607.58 km) |
| Grantham to Orta Nova | 1,104.78 mi (1,777.96 km) |
| Grantham to Orte | 939.92 mi (1,512.65 km) |
| Grantham to Ortona | 1,007.69 mi (1,621.72 km) |
| Grantham to Orvieto | 917.26 mi (1,476.19 km) |
| Grantham to Orzinuovi | 704.25 mi (1,133.38 km) |
| Grantham to Osimo | 917.67 mi (1,476.85 km) |
| Grantham to Ospitaletto | 700.20 mi (1,126.87 km) |
| Grantham to Ostuni | 1,197.96 mi (1,927.93 km) |
| Grantham to Ottaviano | 1,093.09 mi (1,759.16 km) |
| Grantham to Ovada | 710.03 mi (1,142.68 km) |
| Grantham to Ozieri | 964.70 mi (1,552.54 km) |
| Grantham to Paceco | 1,209.53 mi (1,946.56 km) |
