| Horta to Oerlinghausen | 2,008.21 mi (3,231.90 km) |
| Horta to Oestrich-Winkel | 1,953.32 mi (3,143.57 km) |
| Horta to Offenburg | 1,934.88 mi (3,113.89 km) |
| Horta to Oftersheim | 1,972.40 mi (3,174.26 km) |
| Horta to Ohrdruf | 2,081.24 mi (3,349.44 km) |
| Horta to Ohringen | 2,011.76 mi (3,237.61 km) |
| Horta to Olbernhau | 2,192.58 mi (3,528.62 km) |
| Horta to Olching | 2,087.91 mi (3,360.16 km) |
| Horta to Oldenburg | 2,009.29 mi (3,233.64 km) |
| Horta to Oldenburg in Holstein | 2,135.14 mi (3,436.17 km) |
| Horta to Olfen | 1,950.94 mi (3,139.73 km) |
| Horta to Olpe | 1,959.27 mi (3,153.15 km) |
| Horta to Olsberg | 1,991.53 mi (3,205.06 km) |
| Horta to Oranienburg | 2,207.86 mi (3,553.21 km) |
| Horta to Ortenberg | 2,003.46 mi (3,224.25 km) |
