| Arcos de Valdevez to Orbetello | 1,004.30 mi (1,616.27 km) |
| Arcos de Valdevez to Oria | 1,352.89 mi (2,177.27 km) |
| Arcos de Valdevez to Oristano | 897.20 mi (1,443.91 km) |
| Arcos de Valdevez to Orta Nova | 1,243.36 mi (2,000.99 km) |
| Arcos de Valdevez to Orte | 1,063.83 mi (1,712.07 km) |
| Arcos de Valdevez to Ortona | 1,166.84 mi (1,877.84 km) |
| Arcos de Valdevez to Orvieto | 1,048.52 mi (1,687.44 km) |
| Arcos de Valdevez to Orzinuovi | 947.80 mi (1,525.34 km) |
| Arcos de Valdevez to Osimo | 1,115.23 mi (1,794.78 km) |
| Arcos de Valdevez to Ospitaletto | 956.13 mi (1,538.74 km) |
| Arcos de Valdevez to Ostuni | 1,346.92 mi (2,167.66 km) |
| Arcos de Valdevez to Ottaviano | 1,186.07 mi (1,908.79 km) |
| Arcos de Valdevez to Ovada | 878.54 mi (1,413.87 km) |
| Arcos de Valdevez to Ozieri | 908.10 mi (1,461.45 km) |
| Arcos de Valdevez to Paceco | 1,139.70 mi (1,834.16 km) |
