| Dorridge to Orbetello | 913.05 mi (1,469.41 km) |
| Dorridge to Oria | 1,227.90 mi (1,976.11 km) |
| Dorridge to Oristano | 991.37 mi (1,595.45 km) |
| Dorridge to Orta Nova | 1,118.50 mi (1,800.05 km) |
| Dorridge to Orte | 948.66 mi (1,526.72 km) |
| Dorridge to Ortona | 1,021.04 mi (1,643.20 km) |
| Dorridge to Orvieto | 925.98 mi (1,490.22 km) |
| Dorridge to Orzinuovi | 715.40 mi (1,151.32 km) |
| Dorridge to Osimo | 932.00 mi (1,499.91 km) |
| Dorridge to Ospitaletto | 712.38 mi (1,146.46 km) |
| Dorridge to Ostuni | 1,214.13 mi (1,953.96 km) |
| Dorridge to Ottaviano | 1,102.98 mi (1,775.07 km) |
| Dorridge to Ovada | 714.27 mi (1,149.51 km) |
| Dorridge to Ozieri | 959.63 mi (1,544.37 km) |
| Dorridge to Paceco | 1,209.21 mi (1,946.04 km) |
