| Horten to Oerlinghausen | 519.55 mi (836.14 km) |
| Horten to Oestrich-Winkel | 658.00 mi (1,058.96 km) |
| Horten to Offenburg | 763.51 mi (1,228.75 km) |
| Horten to Oftersheim | 698.30 mi (1,123.80 km) |
| Horten to Ohrdruf | 593.81 mi (955.65 km) |
| Horten to Ohringen | 707.17 mi (1,138.08 km) |
| Horten to Olbernhau | 615.50 mi (990.55 km) |
| Horten to Olching | 776.10 mi (1,249.02 km) |
| Horten to Oldenburg | 441.90 mi (711.17 km) |
| Horten to Oldenburg in Holstein | 354.22 mi (570.06 km) |
| Horten to Olfen | 545.32 mi (877.61 km) |
| Horten to Olpe | 589.52 mi (948.74 km) |
| Horten to Olsberg | 562.80 mi (905.74 km) |
| Horten to Oranienburg | 473.01 mi (761.23 km) |
| Horten to Ortenberg | 628.68 mi (1,011.77 km) |
