| Sierre to Oerlinghausen | 394.86 mi (635.46 km) |
| Sierre to Oestrich-Winkel | 256.55 mi (412.87 km) |
| Sierre to Offenburg | 150.87 mi (242.80 km) |
| Sierre to Oftersheim | 217.68 mi (350.33 km) |
| Sierre to Ohrdruf | 345.29 mi (555.70 km) |
| Sierre to Ohringen | 220.20 mi (354.37 km) |
| Sierre to Olbernhau | 401.73 mi (646.52 km) |
| Sierre to Olching | 220.68 mi (355.15 km) |
| Sierre to Oldenburg | 473.84 mi (762.57 km) |
| Sierre to Oldenburg in Holstein | 572.01 mi (920.56 km) |
| Sierre to Olfen | 374.32 mi (602.41 km) |
| Sierre to Olpe | 326.18 mi (524.93 km) |
| Sierre to Olsberg | 351.58 mi (565.81 km) |
| Sierre to Oranienburg | 513.73 mi (826.77 km) |
| Sierre to Ortenberg | 288.80 mi (464.78 km) |
