| Elk River to Oerlinghausen | 4,288.65 mi (6,901.92 km) |
| Elk River to Oestrich-Winkel | 4,351.99 mi (7,003.85 km) |
| Elk River to Offenburg | 4,417.27 mi (7,108.91 km) |
| Elk River to Oftersheim | 4,399.86 mi (7,080.90 km) |
| Elk River to Ohrdruf | 4,407.43 mi (7,093.07 km) |
| Elk River to Ohringen | 4,438.97 mi (7,143.84 km) |
| Elk River to Olbernhau | 4,500.11 mi (7,242.23 km) |
| Elk River to Olching | 4,546.81 mi (7,317.39 km) |
| Elk River to Oldenburg | 4,223.06 mi (6,796.36 km) |
| Elk River to Oldenburg in Holstein | 4,258.18 mi (6,852.88 km) |
| Elk River to Olfen | 4,256.64 mi (6,850.40 km) |
| Elk River to Olpe | 4,301.98 mi (6,923.38 km) |
| Elk River to Olsberg | 4,309.38 mi (6,935.28 km) |
| Elk River to Oranienburg | 4,400.97 mi (7,082.68 km) |
| Elk River to Ortenberg | 4,372.30 mi (7,036.54 km) |
