| Washougal to Orbetello | 5,717.97 mi (9,202.19 km) |
| Washougal to Oria | 5,995.33 mi (9,648.55 km) |
| Washougal to Oristano | 5,796.23 mi (9,328.13 km) |
| Washougal to Orta Nova | 5,898.20 mi (9,492.23 km) |
| Washougal to Orte | 5,747.00 mi (9,248.91 km) |
| Washougal to Ortona | 5,804.14 mi (9,340.87 km) |
| Washougal to Orvieto | 5,724.54 mi (9,212.76 km) |
| Washougal to Orzinuovi | 5,510.07 mi (8,867.60 km) |
| Washougal to Osimo | 5,713.16 mi (9,194.45 km) |
| Washougal to Ospitaletto | 5,504.51 mi (8,858.65 km) |
| Washougal to Ostuni | 5,979.76 mi (9,623.49 km) |
| Washougal to Ottaviano | 5,896.91 mi (9,490.17 km) |
| Washougal to Ovada | 5,521.20 mi (8,885.51 km) |
| Washougal to Ozieri | 5,767.96 mi (9,282.64 km) |
| Washougal to Paceco | 6,019.49 mi (9,687.43 km) |
