| Oro Valley to Orbetello | 6,099.91 mi (9,816.86 km) |
| Oro Valley to Oria | 6,425.75 mi (10,341.25 km) |
| Oro Valley to Oristano | 6,121.75 mi (9,852.00 km) |
| Oro Valley to Orta Nova | 6,315.97 mi (10,164.57 km) |
| Oro Valley to Orte | 6,141.37 mi (9,883.59 km) |
| Oro Valley to Ortona | 6,218.43 mi (10,007.60 km) |
| Oro Valley to Orvieto | 6,118.85 mi (9,847.33 km) |
| Oro Valley to Orzinuovi | 5,912.20 mi (9,514.76 km) |
| Oro Valley to Osimo | 6,129.81 mi (9,864.98 km) |
| Oro Valley to Ospitaletto | 5,909.74 mi (9,510.81 km) |
| Oro Valley to Ostuni | 6,411.92 mi (10,318.99 km) |
| Oro Valley to Ottaviano | 6,296.40 mi (10,133.07 km) |
| Oro Valley to Ovada | 5,902.08 mi (9,498.49 km) |
| Oro Valley to Ozieri | 6,105.74 mi (9,826.25 km) |
| Oro Valley to Paceco | 6,367.00 mi (10,246.70 km) |
