| Desborough to Orbetello | 888.36 mi (1,429.67 km) |
| Desborough to Oria | 1,198.27 mi (1,928.43 km) |
| Desborough to Oristano | 974.14 mi (1,567.73 km) |
| Desborough to Orta Nova | 1,089.79 mi (1,753.85 km) |
| Desborough to Orte | 922.33 mi (1,484.34 km) |
| Desborough to Ortona | 992.47 mi (1,597.23 km) |
| Desborough to Orvieto | 899.65 mi (1,447.84 km) |
| Desborough to Orzinuovi | 687.71 mi (1,106.76 km) |
| Desborough to Osimo | 902.93 mi (1,453.13 km) |
| Desborough to Ospitaletto | 684.19 mi (1,101.09 km) |
| Desborough to Ostuni | 1,184.32 mi (1,905.98 km) |
| Desborough to Ottaviano | 1,076.14 mi (1,731.87 km) |
| Desborough to Ovada | 690.13 mi (1,110.65 km) |
| Desborough to Ozieri | 940.91 mi (1,514.25 km) |
| Desborough to Paceco | 1,187.84 mi (1,911.64 km) |
