| The Dalles to Oerlinghausen | 5,067.61 mi (8,155.53 km) |
| The Dalles to Oestrich-Winkel | 5,163.79 mi (8,310.31 km) |
| The Dalles to Offenburg | 5,249.82 mi (8,448.76 km) |
| The Dalles to Oftersheim | 5,214.46 mi (8,391.86 km) |
| The Dalles to Ohrdruf | 5,182.28 mi (8,340.08 km) |
| The Dalles to Ohringen | 5,247.03 mi (8,444.28 km) |
| The Dalles to Olbernhau | 5,251.63 mi (8,451.68 km) |
| The Dalles to Olching | 5,349.83 mi (8,609.71 km) |
| The Dalles to Oldenburg | 4,989.72 mi (8,030.19 km) |
| The Dalles to Oldenburg in Holstein | 4,984.15 mi (8,021.21 km) |
| The Dalles to Olfen | 5,050.83 mi (8,128.52 km) |
| The Dalles to Olpe | 5,101.65 mi (8,210.31 km) |
| The Dalles to Olsberg | 5,098.48 mi (8,205.22 km) |
| The Dalles to Oranienburg | 5,126.00 mi (8,249.49 km) |
| The Dalles to Ortenberg | 5,169.43 mi (8,319.39 km) |
