| Tualatin to Orbetello | 5,741.12 mi (9,239.44 km) |
| Tualatin to Oria | 6,017.86 mi (9,684.81 km) |
| Tualatin to Oristano | 5,819.86 mi (9,366.17 km) |
| Tualatin to Orta Nova | 5,920.91 mi (9,528.78 km) |
| Tualatin to Orte | 5,770.01 mi (9,285.94 km) |
| Tualatin to Ortona | 5,826.92 mi (9,377.53 km) |
| Tualatin to Orvieto | 5,747.56 mi (9,249.81 km) |
| Tualatin to Orzinuovi | 5,533.08 mi (8,904.64 km) |
| Tualatin to Osimo | 5,735.95 mi (9,231.12 km) |
| Tualatin to Ospitaletto | 5,527.49 mi (8,895.64 km) |
| Tualatin to Ostuni | 6,002.28 mi (9,659.73 km) |
| Tualatin to Ottaviano | 5,919.82 mi (9,527.03 km) |
| Tualatin to Ovada | 5,544.42 mi (8,922.88 km) |
| Tualatin to Ozieri | 5,791.50 mi (9,320.52 km) |
| Tualatin to Paceco | 6,042.86 mi (9,725.05 km) |
