| Horstel to Obernburg am Main | 182.70 mi (294.03 km) |
| Horstel to Obernkirchen | 64.78 mi (104.25 km) |
| Horstel to Oberschleissheim | 330.18 mi (531.37 km) |
| Horstel to Oberstdorf | 358.31 mi (576.64 km) |
| Horstel to Obertraubling | 305.31 mi (491.34 km) |
| Horstel to Obertshausen | 163.30 mi (262.80 km) |
| Horstel to Oberursel | 150.88 mi (242.82 km) |
| Horstel to Ochsenfurt | 212.34 mi (341.73 km) |
| Horstel to Ochsenhausen | 310.02 mi (498.92 km) |
| Horstel to Ochtrup | 17.90 mi (28.80 km) |
| Horstel to Odenthal | 89.61 mi (144.22 km) |
| Horstel to Oelde | 40.01 mi (64.39 km) |
| Horstel to Oelsnitz | 236.45 mi (380.53 km) |
| Horstel to Oer-Erkenschwick | 47.45 mi (76.37 km) |
| Horstel to Oerlinghausen | 51.20 mi (82.41 km) |
