| Troutdale to Oerlinghausen | 5,100.41 mi (8,208.31 km) |
| Troutdale to Oestrich-Winkel | 5,197.85 mi (8,365.13 km) |
| Troutdale to Offenburg | 5,284.64 mi (8,504.81 km) |
| Troutdale to Oftersheim | 5,248.55 mi (8,446.72 km) |
| Troutdale to Ohrdruf | 5,214.67 mi (8,392.20 km) |
| Troutdale to Ohringen | 5,280.77 mi (8,498.58 km) |
| Troutdale to Olbernhau | 5,282.84 mi (8,501.90 km) |
| Troutdale to Olching | 5,383.15 mi (8,663.34 km) |
| Troutdale to Oldenburg | 5,022.13 mi (8,082.35 km) |
| Troutdale to Oldenburg in Holstein | 5,014.78 mi (8,070.50 km) |
| Troutdale to Olfen | 5,084.33 mi (8,182.44 km) |
| Troutdale to Olpe | 5,135.29 mi (8,264.46 km) |
| Troutdale to Olsberg | 5,131.67 mi (8,258.62 km) |
| Troutdale to Oranienburg | 5,156.28 mi (8,298.24 km) |
| Troutdale to Ortenberg | 5,202.83 mi (8,373.14 km) |
