| Tigard to Orbetello | 5,738.66 mi (9,235.47 km) |
| Tigard to Oria | 6,015.28 mi (9,680.66 km) |
| Tigard to Oristano | 5,817.52 mi (9,362.39 km) |
| Tigard to Orta Nova | 5,918.36 mi (9,524.68 km) |
| Tigard to Orte | 5,767.52 mi (9,281.93 km) |
| Tigard to Ortona | 5,824.39 mi (9,373.45 km) |
| Tigard to Orvieto | 5,745.07 mi (9,245.80 km) |
| Tigard to Orzinuovi | 5,530.59 mi (8,900.63 km) |
| Tigard to Osimo | 5,733.42 mi (9,227.05 km) |
| Tigard to Ospitaletto | 5,524.99 mi (8,891.62 km) |
| Tigard to Ostuni | 5,999.69 mi (9,655.57 km) |
| Tigard to Ottaviano | 5,917.31 mi (9,522.99 km) |
| Tigard to Ovada | 5,541.97 mi (8,918.94 km) |
| Tigard to Ozieri | 5,789.13 mi (9,316.70 km) |
| Tigard to Paceco | 6,040.45 mi (9,721.17 km) |
