| Walthamstow to Orbetello | 822.29 mi (1,323.34 km) |
| Walthamstow to Oria | 1,136.21 mi (1,828.56 km) |
| Walthamstow to Oristano | 906.01 mi (1,458.09 km) |
| Walthamstow to Orta Nova | 1,026.78 mi (1,652.45 km) |
| Walthamstow to Orte | 857.31 mi (1,379.70 km) |
| Walthamstow to Ortona | 929.32 mi (1,495.60 km) |
| Walthamstow to Orvieto | 834.62 mi (1,343.20 km) |
| Walthamstow to Orzinuovi | 623.74 mi (1,003.81 km) |
| Walthamstow to Osimo | 840.29 mi (1,352.32 km) |
| Walthamstow to Ospitaletto | 620.67 mi (998.88 km) |
| Walthamstow to Ostuni | 1,122.47 mi (1,806.45 km) |
| Walthamstow to Ottaviano | 1,011.50 mi (1,627.86 km) |
| Walthamstow to Ovada | 623.72 mi (1,003.78 km) |
| Walthamstow to Ozieri | 872.89 mi (1,404.78 km) |
| Walthamstow to Paceco | 1,120.40 mi (1,803.10 km) |
