| Totteridge to Orbetello | 830.20 mi (1,336.07 km) |
| Totteridge to Oria | 1,144.53 mi (1,841.95 km) |
| Totteridge to Oristano | 912.98 mi (1,469.30 km) |
| Totteridge to Orta Nova | 1,035.04 mi (1,665.74 km) |
| Totteridge to Orte | 865.38 mi (1,392.69 km) |
| Totteridge to Ortona | 937.58 mi (1,508.88 km) |
| Totteridge to Orvieto | 842.69 mi (1,356.18 km) |
| Totteridge to Orzinuovi | 631.94 mi (1,017.01 km) |
| Totteridge to Osimo | 848.58 mi (1,365.66 km) |
| Totteridge to Ospitaletto | 628.91 mi (1,012.13 km) |
| Totteridge to Ostuni | 1,130.81 mi (1,819.86 km) |
| Totteridge to Ottaviano | 1,019.62 mi (1,640.91 km) |
| Totteridge to Ovada | 631.57 mi (1,016.42 km) |
| Totteridge to Ozieri | 880.07 mi (1,416.33 km) |
| Totteridge to Paceco | 1,127.93 mi (1,815.22 km) |
